Tau Hydrae
Encyclopedia
The Bayer designation
Tau Hydrae (τ Hya, τ Hydrae) is shared by two star system
s, τ¹ Hydrae and τ² Hydrae, in the constellation
Hydra
. The two stars are separated by 1.74° in the sky.
This star (τ¹ Hya and τ² Hya), along with ι Hya and the 5th‑magnitude 33 Hya (A Hydrae}, were Ptolemy's Καμπή (Kampē); but Kazwini knew them as ʽUḳdah, the Knot.
lying 56 light years
from Earth
. It is a spectral type
F6 main sequence
star which has an apparent magnitude
of +4.59.
A3 main sequence
star which has an apparent magnitude
of +4.54. It is about 460 light years from Earth
.
In Chinese
, , meaning Star
(asterism), refers to an asterism consisting of τ¹ Hydra and τ² Hydra, Alphard
, ι Hydrae, 26 Hydrae, 27 Hydrae
, HD 82477 and HD 82428. Consequently, τ¹ Hydra and τ² themself is known as
The Bayer designation
Tau Hydrae (τ Hya, τ Hydrae) is shared by two star system
s, τ¹ Hydrae and τ² Hydrae, in the constellation
Hydra
. The two stars are separated by 1.74° in the sky.
This star (τ¹ Hya and τ² Hya), along with ι Hya and the 5th‑magnitude 33 Hya (A Hydrae}, were Ptolemy's Καμπή (Kampē); but Kazwini knew them as ʽUḳdah, the Knot.
lying 56 light years
from Earth
. It is a spectral type
F6 main sequence
star which has an apparent magnitude
of +4.59.
A3 main sequence
star which has an apparent magnitude
of +4.54. It is about 460 light years from Earth
.
In Chinese
, , meaning Star
(asterism), refers to an asterism consisting of τ¹ Hydra and τ² Hydra, Alphard
, ι Hydrae, 26 Hydrae, 27 Hydrae
, HD 82477 and HD 82428. Consequently, τ¹ Hydra and τ² themself is known as
The Bayer designation
Tau Hydrae (τ Hya, τ Hydrae) is shared by two star system
s, τ¹ Hydrae and τ² Hydrae, in the constellation
Hydra
. The two stars are separated by 1.74° in the sky.
This star (τ¹ Hya and τ² Hya), along with ι Hya and the 5th‑magnitude 33 Hya (A Hydrae}, were Ptolemy's Καμπή (Kampē); but Kazwini knew them as ʽUḳdah, the Knot.
lying 56 light years
from Earth
. It is a spectral type
F6 main sequence
star which has an apparent magnitude
of +4.59.
A3 main sequence
star which has an apparent magnitude
of +4.54. It is about 460 light years from Earth
.
In Chinese
, , meaning Star
(asterism), refers to an asterism consisting of τ¹ Hydra and τ² Hydra, Alphard
, ι Hydrae, 26 Hydrae, 27 Hydrae
, HD 82477 and HD 82428. Consequently, τ¹ Hydra and τ² themself is known as
The Bayer designation
Tau Hydrae (τ Hya, τ Hydrae) is shared by two star system
s, τ¹ Hydrae and τ² Hydrae, in the constellation
Hydra
. The two stars are separated by 1.74° in the sky.
This star (τ¹ Hya and τ² Hya), along with ι Hya and the 5th‑magnitude 33 Hya (A Hydrae}, were Ptolemy's Καμπή (Kampē); but Kazwini knew them as ʽUḳdah, the Knot.
lying 56 light years
from Earth
. It is a spectral type
F6 main sequence
star which has an apparent magnitude
of +4.59.
A3 main sequence
star which has an apparent magnitude
of +4.54. It is about 460 light years from Earth
.
In Chinese
, , meaning Star
(asterism), refers to an asterism consisting of τ¹ Hydra and τ² Hydra, Alphard
, ι Hydrae, 26 Hydrae, 27 Hydrae
, HD 82477 and HD 82428. Consequently, τ¹ Hydra and τ² themself is known as
The Bayer designation
Tau Hydrae (τ Hya, τ Hydrae) is shared by two star system
s, τ¹ Hydrae and τ² Hydrae, in the constellation
Hydra
. The two stars are separated by 1.74° in the sky.
This star (τ¹ Hya and τ² Hya), along with ι Hya and the 5th‑magnitude 33 Hya (A Hydrae}, were Ptolemy's Καμπή (Kampē); but Kazwini knew them as ʽUḳdah, the Knot.
lying 56 light years
from Earth
. It is a spectral type
F6 main sequence
star which has an apparent magnitude
of +4.59.
A3 main sequence
star which has an apparent magnitude
of +4.54. It is about 460 light years from Earth
.
In Chinese
, , meaning Star
(asterism), refers to an asterism consisting of τ¹ Hydra and τ² Hydra, Alphard
, ι Hydrae, 26 Hydrae, 27 Hydrae
, HD 82477 and HD 82428. Consequently, τ¹ Hydra and τ² themself is known as
The Bayer designation
Tau Hydrae (τ Hya, τ Hydrae) is shared by two star system
s, τ¹ Hydrae and τ² Hydrae, in the constellation
Hydra
. The two stars are separated by 1.74° in the sky.
This star (τ¹ Hya and τ² Hya), along with ι Hya and the 5th‑magnitude 33 Hya (A Hydrae}, were Ptolemy's Καμπή (Kampē); but Kazwini knew them as ʽUḳdah, the Knot.
lying 56 light years
from Earth
. It is a spectral type
F6 main sequence
star which has an apparent magnitude
of +4.59.
A3 main sequence
star which has an apparent magnitude
of +4.54. It is about 460 light years from Earth
.
In Chinese
, , meaning Star
(asterism), refers to an asterism consisting of τ¹ Hydra and τ² Hydra, Alphard
, ι Hydrae, 26 Hydrae, 27 Hydrae
, HD 82477 and HD 82428. Consequently, τ¹ Hydra and τ² themself is known as
The Bayer designation
Tau Hydrae (τ Hya, τ Hydrae) is shared by two star system
s, τ¹ Hydrae and τ² Hydrae, in the constellation
Hydra
. The two stars are separated by 1.74° in the sky.
This star (τ¹ Hya and τ² Hya), along with ι Hya and the 5th‑magnitude 33 Hya (A Hydrae}, were Ptolemy's Καμπή (Kampē); but Kazwini knew them as ʽUḳdah, the Knot.
lying 56 light years
from Earth
. It is a spectral type
F6 main sequence
star which has an apparent magnitude
of +4.59.
A3 main sequence
star which has an apparent magnitude
of +4.54. It is about 460 light years from Earth
.
In Chinese
, , meaning Star
(asterism), refers to an asterism consisting of τ¹ Hydra and τ² Hydra, Alphard
, ι Hydrae, 26 Hydrae, 27 Hydrae
, HD 82477 and HD 82428. Consequently, τ¹ Hydra and τ² themself is known as
The Bayer designation
Tau Hydrae (τ Hya, τ Hydrae) is shared by two star system
s, τ¹ Hydrae and τ² Hydrae, in the constellation
Hydra
. The two stars are separated by 1.74° in the sky.
This star (τ¹ Hya and τ² Hya), along with ι Hya and the 5th‑magnitude 33 Hya (A Hydrae}, were Ptolemy's Καμπή (Kampē); but Kazwini knew them as ʽUḳdah, the Knot.
lying 56 light years
from Earth
. It is a spectral type
F6 main sequence
star which has an apparent magnitude
of +4.59.
A3 main sequence
star which has an apparent magnitude
of +4.54. It is about 460 light years from Earth
.
In Chinese
, , meaning Star
(asterism), refers to an asterism consisting of τ¹ Hydra and τ² Hydra, Alphard
, ι Hydrae, 26 Hydrae, 27 Hydrae
, HD 82477 and HD 82428. Consequently, τ¹ Hydra and τ² themself is known as
The Bayer designation
Tau Hydrae (τ Hya, τ Hydrae) is shared by two star system
s, τ¹ Hydrae and τ² Hydrae, in the constellation
Hydra
. The two stars are separated by 1.74° in the sky.
This star (τ¹ Hya and τ² Hya), along with ι Hya and the 5th‑magnitude 33 Hya (A Hydrae}, were Ptolemy's Καμπή (Kampē); but Kazwini knew them as ʽUḳdah, the Knot.
lying 56 light years
from Earth
. It is a spectral type
F6 main sequence
star which has an apparent magnitude
of +4.59.
A3 main sequence
star which has an apparent magnitude
of +4.54. It is about 460 light years from Earth
.
In Chinese
, , meaning Star
(asterism), refers to an asterism consisting of τ¹ Hydra and τ² Hydra, Alphard
, ι Hydrae, 26 Hydrae, 27 Hydrae
, HD 82477 and HD 82428. Consequently, τ¹ Hydra and τ² themself is known as (, the Second Star of Star and (, the Third Star of Star.)
Bayer designation
A Bayer designation is a stellar designation in which a specific star is identified by a Greek letter, followed by the genitive form of its parent constellation's Latin name...
Tau Hydrae (τ Hya, τ Hydrae) is shared by two star system
Star system
A star system or stellar system is a small number of stars which orbit each other, bound by gravitational attraction. A large number of stars bound by gravitation is generally called a star cluster or galaxy, although, broadly speaking, they are also star systems.-Binary star systems:A stellar...
s, τ¹ Hydrae and τ² Hydrae, in the constellation
Constellation
In modern astronomy, a constellation is an internationally defined area of the celestial sphere. These areas are grouped around asterisms, patterns formed by prominent stars within apparent proximity to one another on Earth's night sky....
Hydra
Hydra (constellation)
Hydra is the largest of the 88 modern constellations, measuring 1303 square degrees. It has a long history, having been included among the 48 constellations listed by the 2nd century astronomer Ptolemy. It is commonly represented as a water snake...
. The two stars are separated by 1.74° in the sky.
This star (τ¹ Hya and τ² Hya), along with ι Hya and the 5th‑magnitude 33 Hya (A Hydrae}, were Ptolemy's Καμπή (Kampē); but Kazwini knew them as ʽUḳdah, the Knot.
τ¹ Hydrae
Tau-1 Hydrae is a binary starBinary star
A binary star is a star system consisting of two stars orbiting around their common center of mass. The brighter star is called the primary and the other is its companion star, comes, or secondary...
lying 56 light years
Light Years
Light Years is the seventh studio album by Australian recording artist Kylie Minogue. It was released on 25 September 2000 by Parlophone and Mushroom Records. The album's style was indicative of her return to "mainstream pop dance tunes"....
from Earth
Earth
Earth is the third planet from the Sun, and the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System's four terrestrial planets...
. It is a spectral type
Stellar classification
In astronomy, stellar classification is a classification of stars based on their spectral characteristics. The spectral class of a star is a designated class of a star describing the ionization of its chromosphere, what atomic excitations are most prominent in the light, giving an objective measure...
F6 main sequence
Main sequence
The main sequence is a continuous and distinctive band of stars that appears on plots of stellar color versus brightness. These color-magnitude plots are known as Hertzsprung–Russell diagrams after their co-developers, Ejnar Hertzsprung and Henry Norris Russell...
star which has an apparent magnitude
Apparent magnitude
The apparent magnitude of a celestial body is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere...
of +4.59.
τ² Hydrae
Tau-2 Hydrae is a spectral typeStellar classification
In astronomy, stellar classification is a classification of stars based on their spectral characteristics. The spectral class of a star is a designated class of a star describing the ionization of its chromosphere, what atomic excitations are most prominent in the light, giving an objective measure...
A3 main sequence
Main sequence
The main sequence is a continuous and distinctive band of stars that appears on plots of stellar color versus brightness. These color-magnitude plots are known as Hertzsprung–Russell diagrams after their co-developers, Ejnar Hertzsprung and Henry Norris Russell...
star which has an apparent magnitude
Apparent magnitude
The apparent magnitude of a celestial body is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere...
of +4.54. It is about 460 light years from Earth
Earth
Earth is the third planet from the Sun, and the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System's four terrestrial planets...
.
Name
According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Uḳdah were the title for four stars :τ¹ Hya as Uḳdah I, τ² Hya as Uḳdah II, 33 Hya (A Hydrae} as Uḳdah III and ι Hya as Uḳdah IVIn Chinese
Chinese language
The Chinese language is a language or language family consisting of varieties which are mutually intelligible to varying degrees. Originally the indigenous languages spoken by the Han Chinese in China, it forms one of the branches of Sino-Tibetan family of languages...
, , meaning Star
Star (Chinese constellation)
The Star mansion is one of the Twenty-eight mansions of the Chinese constellations. It is one of the southern mansions of the Vermilion Bird.- Asterisms :...
(asterism), refers to an asterism consisting of τ¹ Hydra and τ² Hydra, Alphard
Alphard
Alphard is the brightest star in the constellation Hydra. The name Alphard is from the Arabic الفرد , "the solitary one", there being no other bright stars near it. It was also known as the "backbone of the Serpent" to the Arabs. In ancient China it formed part of an asterism called the "red bird"...
, ι Hydrae, 26 Hydrae, 27 Hydrae
27 Hydrae
27 Hydrae is an evolved yellow giant star in the constellation of Hydra. The star is suspected to host a low-mass companion.-Substellar companion:...
, HD 82477 and HD 82428. Consequently, τ¹ Hydra and τ² themself is known as
The Bayer designation
Bayer designation
A Bayer designation is a stellar designation in which a specific star is identified by a Greek letter, followed by the genitive form of its parent constellation's Latin name...
Tau Hydrae (τ Hya, τ Hydrae) is shared by two star system
Star system
A star system or stellar system is a small number of stars which orbit each other, bound by gravitational attraction. A large number of stars bound by gravitation is generally called a star cluster or galaxy, although, broadly speaking, they are also star systems.-Binary star systems:A stellar...
s, τ¹ Hydrae and τ² Hydrae, in the constellation
Constellation
In modern astronomy, a constellation is an internationally defined area of the celestial sphere. These areas are grouped around asterisms, patterns formed by prominent stars within apparent proximity to one another on Earth's night sky....
Hydra
Hydra (constellation)
Hydra is the largest of the 88 modern constellations, measuring 1303 square degrees. It has a long history, having been included among the 48 constellations listed by the 2nd century astronomer Ptolemy. It is commonly represented as a water snake...
. The two stars are separated by 1.74° in the sky.
This star (τ¹ Hya and τ² Hya), along with ι Hya and the 5th‑magnitude 33 Hya (A Hydrae}, were Ptolemy's Καμπή (Kampē); but Kazwini knew them as ʽUḳdah, the Knot.
τ¹ Hydrae
Tau-1 Hydrae is a binary starBinary star
A binary star is a star system consisting of two stars orbiting around their common center of mass. The brighter star is called the primary and the other is its companion star, comes, or secondary...
lying 56 light years
Light Years
Light Years is the seventh studio album by Australian recording artist Kylie Minogue. It was released on 25 September 2000 by Parlophone and Mushroom Records. The album's style was indicative of her return to "mainstream pop dance tunes"....
from Earth
Earth
Earth is the third planet from the Sun, and the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System's four terrestrial planets...
. It is a spectral type
Stellar classification
In astronomy, stellar classification is a classification of stars based on their spectral characteristics. The spectral class of a star is a designated class of a star describing the ionization of its chromosphere, what atomic excitations are most prominent in the light, giving an objective measure...
F6 main sequence
Main sequence
The main sequence is a continuous and distinctive band of stars that appears on plots of stellar color versus brightness. These color-magnitude plots are known as Hertzsprung–Russell diagrams after their co-developers, Ejnar Hertzsprung and Henry Norris Russell...
star which has an apparent magnitude
Apparent magnitude
The apparent magnitude of a celestial body is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere...
of +4.59.
τ² Hydrae
Tau-2 Hydrae is a spectral typeStellar classification
In astronomy, stellar classification is a classification of stars based on their spectral characteristics. The spectral class of a star is a designated class of a star describing the ionization of its chromosphere, what atomic excitations are most prominent in the light, giving an objective measure...
A3 main sequence
Main sequence
The main sequence is a continuous and distinctive band of stars that appears on plots of stellar color versus brightness. These color-magnitude plots are known as Hertzsprung–Russell diagrams after their co-developers, Ejnar Hertzsprung and Henry Norris Russell...
star which has an apparent magnitude
Apparent magnitude
The apparent magnitude of a celestial body is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere...
of +4.54. It is about 460 light years from Earth
Earth
Earth is the third planet from the Sun, and the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System's four terrestrial planets...
.
Name
According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Uḳdah were the title for four stars :τ¹ Hya as Uḳdah I, τ² Hya as Uḳdah II, 33 Hya (A Hydrae} as Uḳdah III and ι Hya as Uḳdah IVIn Chinese
Chinese language
The Chinese language is a language or language family consisting of varieties which are mutually intelligible to varying degrees. Originally the indigenous languages spoken by the Han Chinese in China, it forms one of the branches of Sino-Tibetan family of languages...
, , meaning Star
Star (Chinese constellation)
The Star mansion is one of the Twenty-eight mansions of the Chinese constellations. It is one of the southern mansions of the Vermilion Bird.- Asterisms :...
(asterism), refers to an asterism consisting of τ¹ Hydra and τ² Hydra, Alphard
Alphard
Alphard is the brightest star in the constellation Hydra. The name Alphard is from the Arabic الفرد , "the solitary one", there being no other bright stars near it. It was also known as the "backbone of the Serpent" to the Arabs. In ancient China it formed part of an asterism called the "red bird"...
, ι Hydrae, 26 Hydrae, 27 Hydrae
27 Hydrae
27 Hydrae is an evolved yellow giant star in the constellation of Hydra. The star is suspected to host a low-mass companion.-Substellar companion:...
, HD 82477 and HD 82428. Consequently, τ¹ Hydra and τ² themself is known as
The Bayer designation
Bayer designation
A Bayer designation is a stellar designation in which a specific star is identified by a Greek letter, followed by the genitive form of its parent constellation's Latin name...
Tau Hydrae (τ Hya, τ Hydrae) is shared by two star system
Star system
A star system or stellar system is a small number of stars which orbit each other, bound by gravitational attraction. A large number of stars bound by gravitation is generally called a star cluster or galaxy, although, broadly speaking, they are also star systems.-Binary star systems:A stellar...
s, τ¹ Hydrae and τ² Hydrae, in the constellation
Constellation
In modern astronomy, a constellation is an internationally defined area of the celestial sphere. These areas are grouped around asterisms, patterns formed by prominent stars within apparent proximity to one another on Earth's night sky....
Hydra
Hydra (constellation)
Hydra is the largest of the 88 modern constellations, measuring 1303 square degrees. It has a long history, having been included among the 48 constellations listed by the 2nd century astronomer Ptolemy. It is commonly represented as a water snake...
. The two stars are separated by 1.74° in the sky.
This star (τ¹ Hya and τ² Hya), along with ι Hya and the 5th‑magnitude 33 Hya (A Hydrae}, were Ptolemy's Καμπή (Kampē); but Kazwini knew them as ʽUḳdah, the Knot.
τ¹ Hydrae
Tau-1 Hydrae is a binary starBinary star
A binary star is a star system consisting of two stars orbiting around their common center of mass. The brighter star is called the primary and the other is its companion star, comes, or secondary...
lying 56 light years
Light Years
Light Years is the seventh studio album by Australian recording artist Kylie Minogue. It was released on 25 September 2000 by Parlophone and Mushroom Records. The album's style was indicative of her return to "mainstream pop dance tunes"....
from Earth
Earth
Earth is the third planet from the Sun, and the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System's four terrestrial planets...
. It is a spectral type
Stellar classification
In astronomy, stellar classification is a classification of stars based on their spectral characteristics. The spectral class of a star is a designated class of a star describing the ionization of its chromosphere, what atomic excitations are most prominent in the light, giving an objective measure...
F6 main sequence
Main sequence
The main sequence is a continuous and distinctive band of stars that appears on plots of stellar color versus brightness. These color-magnitude plots are known as Hertzsprung–Russell diagrams after their co-developers, Ejnar Hertzsprung and Henry Norris Russell...
star which has an apparent magnitude
Apparent magnitude
The apparent magnitude of a celestial body is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere...
of +4.59.
τ² Hydrae
Tau-2 Hydrae is a spectral typeStellar classification
In astronomy, stellar classification is a classification of stars based on their spectral characteristics. The spectral class of a star is a designated class of a star describing the ionization of its chromosphere, what atomic excitations are most prominent in the light, giving an objective measure...
A3 main sequence
Main sequence
The main sequence is a continuous and distinctive band of stars that appears on plots of stellar color versus brightness. These color-magnitude plots are known as Hertzsprung–Russell diagrams after their co-developers, Ejnar Hertzsprung and Henry Norris Russell...
star which has an apparent magnitude
Apparent magnitude
The apparent magnitude of a celestial body is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere...
of +4.54. It is about 460 light years from Earth
Earth
Earth is the third planet from the Sun, and the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System's four terrestrial planets...
.
Name
According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Uḳdah were the title for four stars :τ¹ Hya as Uḳdah I, τ² Hya as Uḳdah II, 33 Hya (A Hydrae} as Uḳdah III and ι Hya as Uḳdah IVIn Chinese
Chinese language
The Chinese language is a language or language family consisting of varieties which are mutually intelligible to varying degrees. Originally the indigenous languages spoken by the Han Chinese in China, it forms one of the branches of Sino-Tibetan family of languages...
, , meaning Star
Star (Chinese constellation)
The Star mansion is one of the Twenty-eight mansions of the Chinese constellations. It is one of the southern mansions of the Vermilion Bird.- Asterisms :...
(asterism), refers to an asterism consisting of τ¹ Hydra and τ² Hydra, Alphard
Alphard
Alphard is the brightest star in the constellation Hydra. The name Alphard is from the Arabic الفرد , "the solitary one", there being no other bright stars near it. It was also known as the "backbone of the Serpent" to the Arabs. In ancient China it formed part of an asterism called the "red bird"...
, ι Hydrae, 26 Hydrae, 27 Hydrae
27 Hydrae
27 Hydrae is an evolved yellow giant star in the constellation of Hydra. The star is suspected to host a low-mass companion.-Substellar companion:...
, HD 82477 and HD 82428. Consequently, τ¹ Hydra and τ² themself is known as
The Bayer designation
Bayer designation
A Bayer designation is a stellar designation in which a specific star is identified by a Greek letter, followed by the genitive form of its parent constellation's Latin name...
Tau Hydrae (τ Hya, τ Hydrae) is shared by two star system
Star system
A star system or stellar system is a small number of stars which orbit each other, bound by gravitational attraction. A large number of stars bound by gravitation is generally called a star cluster or galaxy, although, broadly speaking, they are also star systems.-Binary star systems:A stellar...
s, τ¹ Hydrae and τ² Hydrae, in the constellation
Constellation
In modern astronomy, a constellation is an internationally defined area of the celestial sphere. These areas are grouped around asterisms, patterns formed by prominent stars within apparent proximity to one another on Earth's night sky....
Hydra
Hydra (constellation)
Hydra is the largest of the 88 modern constellations, measuring 1303 square degrees. It has a long history, having been included among the 48 constellations listed by the 2nd century astronomer Ptolemy. It is commonly represented as a water snake...
. The two stars are separated by 1.74° in the sky.
This star (τ¹ Hya and τ² Hya), along with ι Hya and the 5th‑magnitude 33 Hya (A Hydrae}, were Ptolemy's Καμπή (Kampē); but Kazwini knew them as ʽUḳdah, the Knot.
τ¹ Hydrae
Tau-1 Hydrae is a binary starBinary star
A binary star is a star system consisting of two stars orbiting around their common center of mass. The brighter star is called the primary and the other is its companion star, comes, or secondary...
lying 56 light years
Light Years
Light Years is the seventh studio album by Australian recording artist Kylie Minogue. It was released on 25 September 2000 by Parlophone and Mushroom Records. The album's style was indicative of her return to "mainstream pop dance tunes"....
from Earth
Earth
Earth is the third planet from the Sun, and the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System's four terrestrial planets...
. It is a spectral type
Stellar classification
In astronomy, stellar classification is a classification of stars based on their spectral characteristics. The spectral class of a star is a designated class of a star describing the ionization of its chromosphere, what atomic excitations are most prominent in the light, giving an objective measure...
F6 main sequence
Main sequence
The main sequence is a continuous and distinctive band of stars that appears on plots of stellar color versus brightness. These color-magnitude plots are known as Hertzsprung–Russell diagrams after their co-developers, Ejnar Hertzsprung and Henry Norris Russell...
star which has an apparent magnitude
Apparent magnitude
The apparent magnitude of a celestial body is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere...
of +4.59.
τ² Hydrae
Tau-2 Hydrae is a spectral typeStellar classification
In astronomy, stellar classification is a classification of stars based on their spectral characteristics. The spectral class of a star is a designated class of a star describing the ionization of its chromosphere, what atomic excitations are most prominent in the light, giving an objective measure...
A3 main sequence
Main sequence
The main sequence is a continuous and distinctive band of stars that appears on plots of stellar color versus brightness. These color-magnitude plots are known as Hertzsprung–Russell diagrams after their co-developers, Ejnar Hertzsprung and Henry Norris Russell...
star which has an apparent magnitude
Apparent magnitude
The apparent magnitude of a celestial body is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere...
of +4.54. It is about 460 light years from Earth
Earth
Earth is the third planet from the Sun, and the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System's four terrestrial planets...
.
Name
According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Uḳdah were the title for four stars :τ¹ Hya as Uḳdah I, τ² Hya as Uḳdah II, 33 Hya (A Hydrae} as Uḳdah III and ι Hya as Uḳdah IVIn Chinese
Chinese language
The Chinese language is a language or language family consisting of varieties which are mutually intelligible to varying degrees. Originally the indigenous languages spoken by the Han Chinese in China, it forms one of the branches of Sino-Tibetan family of languages...
, , meaning Star
Star (Chinese constellation)
The Star mansion is one of the Twenty-eight mansions of the Chinese constellations. It is one of the southern mansions of the Vermilion Bird.- Asterisms :...
(asterism), refers to an asterism consisting of τ¹ Hydra and τ² Hydra, Alphard
Alphard
Alphard is the brightest star in the constellation Hydra. The name Alphard is from the Arabic الفرد , "the solitary one", there being no other bright stars near it. It was also known as the "backbone of the Serpent" to the Arabs. In ancient China it formed part of an asterism called the "red bird"...
, ι Hydrae, 26 Hydrae, 27 Hydrae
27 Hydrae
27 Hydrae is an evolved yellow giant star in the constellation of Hydra. The star is suspected to host a low-mass companion.-Substellar companion:...
, HD 82477 and HD 82428. Consequently, τ¹ Hydra and τ² themself is known as
The Bayer designation
Bayer designation
A Bayer designation is a stellar designation in which a specific star is identified by a Greek letter, followed by the genitive form of its parent constellation's Latin name...
Tau Hydrae (τ Hya, τ Hydrae) is shared by two star system
Star system
A star system or stellar system is a small number of stars which orbit each other, bound by gravitational attraction. A large number of stars bound by gravitation is generally called a star cluster or galaxy, although, broadly speaking, they are also star systems.-Binary star systems:A stellar...
s, τ¹ Hydrae and τ² Hydrae, in the constellation
Constellation
In modern astronomy, a constellation is an internationally defined area of the celestial sphere. These areas are grouped around asterisms, patterns formed by prominent stars within apparent proximity to one another on Earth's night sky....
Hydra
Hydra (constellation)
Hydra is the largest of the 88 modern constellations, measuring 1303 square degrees. It has a long history, having been included among the 48 constellations listed by the 2nd century astronomer Ptolemy. It is commonly represented as a water snake...
. The two stars are separated by 1.74° in the sky.
This star (τ¹ Hya and τ² Hya), along with ι Hya and the 5th‑magnitude 33 Hya (A Hydrae}, were Ptolemy's Καμπή (Kampē); but Kazwini knew them as ʽUḳdah, the Knot.
τ¹ Hydrae
Tau-1 Hydrae is a binary starBinary star
A binary star is a star system consisting of two stars orbiting around their common center of mass. The brighter star is called the primary and the other is its companion star, comes, or secondary...
lying 56 light years
Light Years
Light Years is the seventh studio album by Australian recording artist Kylie Minogue. It was released on 25 September 2000 by Parlophone and Mushroom Records. The album's style was indicative of her return to "mainstream pop dance tunes"....
from Earth
Earth
Earth is the third planet from the Sun, and the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System's four terrestrial planets...
. It is a spectral type
Stellar classification
In astronomy, stellar classification is a classification of stars based on their spectral characteristics. The spectral class of a star is a designated class of a star describing the ionization of its chromosphere, what atomic excitations are most prominent in the light, giving an objective measure...
F6 main sequence
Main sequence
The main sequence is a continuous and distinctive band of stars that appears on plots of stellar color versus brightness. These color-magnitude plots are known as Hertzsprung–Russell diagrams after their co-developers, Ejnar Hertzsprung and Henry Norris Russell...
star which has an apparent magnitude
Apparent magnitude
The apparent magnitude of a celestial body is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere...
of +4.59.
τ² Hydrae
Tau-2 Hydrae is a spectral typeStellar classification
In astronomy, stellar classification is a classification of stars based on their spectral characteristics. The spectral class of a star is a designated class of a star describing the ionization of its chromosphere, what atomic excitations are most prominent in the light, giving an objective measure...
A3 main sequence
Main sequence
The main sequence is a continuous and distinctive band of stars that appears on plots of stellar color versus brightness. These color-magnitude plots are known as Hertzsprung–Russell diagrams after their co-developers, Ejnar Hertzsprung and Henry Norris Russell...
star which has an apparent magnitude
Apparent magnitude
The apparent magnitude of a celestial body is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere...
of +4.54. It is about 460 light years from Earth
Earth
Earth is the third planet from the Sun, and the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System's four terrestrial planets...
.
Name
According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Uḳdah were the title for four stars :τ¹ Hya as Uḳdah I, τ² Hya as Uḳdah II, 33 Hya (A Hydrae} as Uḳdah III and ι Hya as Uḳdah IVIn Chinese
Chinese language
The Chinese language is a language or language family consisting of varieties which are mutually intelligible to varying degrees. Originally the indigenous languages spoken by the Han Chinese in China, it forms one of the branches of Sino-Tibetan family of languages...
, , meaning Star
Star (Chinese constellation)
The Star mansion is one of the Twenty-eight mansions of the Chinese constellations. It is one of the southern mansions of the Vermilion Bird.- Asterisms :...
(asterism), refers to an asterism consisting of τ¹ Hydra and τ² Hydra, Alphard
Alphard
Alphard is the brightest star in the constellation Hydra. The name Alphard is from the Arabic الفرد , "the solitary one", there being no other bright stars near it. It was also known as the "backbone of the Serpent" to the Arabs. In ancient China it formed part of an asterism called the "red bird"...
, ι Hydrae, 26 Hydrae, 27 Hydrae
27 Hydrae
27 Hydrae is an evolved yellow giant star in the constellation of Hydra. The star is suspected to host a low-mass companion.-Substellar companion:...
, HD 82477 and HD 82428. Consequently, τ¹ Hydra and τ² themself is known as
The Bayer designation
Bayer designation
A Bayer designation is a stellar designation in which a specific star is identified by a Greek letter, followed by the genitive form of its parent constellation's Latin name...
Tau Hydrae (τ Hya, τ Hydrae) is shared by two star system
Star system
A star system or stellar system is a small number of stars which orbit each other, bound by gravitational attraction. A large number of stars bound by gravitation is generally called a star cluster or galaxy, although, broadly speaking, they are also star systems.-Binary star systems:A stellar...
s, τ¹ Hydrae and τ² Hydrae, in the constellation
Constellation
In modern astronomy, a constellation is an internationally defined area of the celestial sphere. These areas are grouped around asterisms, patterns formed by prominent stars within apparent proximity to one another on Earth's night sky....
Hydra
Hydra (constellation)
Hydra is the largest of the 88 modern constellations, measuring 1303 square degrees. It has a long history, having been included among the 48 constellations listed by the 2nd century astronomer Ptolemy. It is commonly represented as a water snake...
. The two stars are separated by 1.74° in the sky.
This star (τ¹ Hya and τ² Hya), along with ι Hya and the 5th‑magnitude 33 Hya (A Hydrae}, were Ptolemy's Καμπή (Kampē); but Kazwini knew them as ʽUḳdah, the Knot.
τ¹ Hydrae
Tau-1 Hydrae is a binary starBinary star
A binary star is a star system consisting of two stars orbiting around their common center of mass. The brighter star is called the primary and the other is its companion star, comes, or secondary...
lying 56 light years
Light Years
Light Years is the seventh studio album by Australian recording artist Kylie Minogue. It was released on 25 September 2000 by Parlophone and Mushroom Records. The album's style was indicative of her return to "mainstream pop dance tunes"....
from Earth
Earth
Earth is the third planet from the Sun, and the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System's four terrestrial planets...
. It is a spectral type
Stellar classification
In astronomy, stellar classification is a classification of stars based on their spectral characteristics. The spectral class of a star is a designated class of a star describing the ionization of its chromosphere, what atomic excitations are most prominent in the light, giving an objective measure...
F6 main sequence
Main sequence
The main sequence is a continuous and distinctive band of stars that appears on plots of stellar color versus brightness. These color-magnitude plots are known as Hertzsprung–Russell diagrams after their co-developers, Ejnar Hertzsprung and Henry Norris Russell...
star which has an apparent magnitude
Apparent magnitude
The apparent magnitude of a celestial body is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere...
of +4.59.
τ² Hydrae
Tau-2 Hydrae is a spectral typeStellar classification
In astronomy, stellar classification is a classification of stars based on their spectral characteristics. The spectral class of a star is a designated class of a star describing the ionization of its chromosphere, what atomic excitations are most prominent in the light, giving an objective measure...
A3 main sequence
Main sequence
The main sequence is a continuous and distinctive band of stars that appears on plots of stellar color versus brightness. These color-magnitude plots are known as Hertzsprung–Russell diagrams after their co-developers, Ejnar Hertzsprung and Henry Norris Russell...
star which has an apparent magnitude
Apparent magnitude
The apparent magnitude of a celestial body is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere...
of +4.54. It is about 460 light years from Earth
Earth
Earth is the third planet from the Sun, and the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System's four terrestrial planets...
.
Name
According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Uḳdah were the title for four stars :τ¹ Hya as Uḳdah I, τ² Hya as Uḳdah II, 33 Hya (A Hydrae} as Uḳdah III and ι Hya as Uḳdah IVIn Chinese
Chinese language
The Chinese language is a language or language family consisting of varieties which are mutually intelligible to varying degrees. Originally the indigenous languages spoken by the Han Chinese in China, it forms one of the branches of Sino-Tibetan family of languages...
, , meaning Star
Star (Chinese constellation)
The Star mansion is one of the Twenty-eight mansions of the Chinese constellations. It is one of the southern mansions of the Vermilion Bird.- Asterisms :...
(asterism), refers to an asterism consisting of τ¹ Hydra and τ² Hydra, Alphard
Alphard
Alphard is the brightest star in the constellation Hydra. The name Alphard is from the Arabic الفرد , "the solitary one", there being no other bright stars near it. It was also known as the "backbone of the Serpent" to the Arabs. In ancient China it formed part of an asterism called the "red bird"...
, ι Hydrae, 26 Hydrae, 27 Hydrae
27 Hydrae
27 Hydrae is an evolved yellow giant star in the constellation of Hydra. The star is suspected to host a low-mass companion.-Substellar companion:...
, HD 82477 and HD 82428. Consequently, τ¹ Hydra and τ² themself is known as
The Bayer designation
Bayer designation
A Bayer designation is a stellar designation in which a specific star is identified by a Greek letter, followed by the genitive form of its parent constellation's Latin name...
Tau Hydrae (τ Hya, τ Hydrae) is shared by two star system
Star system
A star system or stellar system is a small number of stars which orbit each other, bound by gravitational attraction. A large number of stars bound by gravitation is generally called a star cluster or galaxy, although, broadly speaking, they are also star systems.-Binary star systems:A stellar...
s, τ¹ Hydrae and τ² Hydrae, in the constellation
Constellation
In modern astronomy, a constellation is an internationally defined area of the celestial sphere. These areas are grouped around asterisms, patterns formed by prominent stars within apparent proximity to one another on Earth's night sky....
Hydra
Hydra (constellation)
Hydra is the largest of the 88 modern constellations, measuring 1303 square degrees. It has a long history, having been included among the 48 constellations listed by the 2nd century astronomer Ptolemy. It is commonly represented as a water snake...
. The two stars are separated by 1.74° in the sky.
This star (τ¹ Hya and τ² Hya), along with ι Hya and the 5th‑magnitude 33 Hya (A Hydrae}, were Ptolemy's Καμπή (Kampē); but Kazwini knew them as ʽUḳdah, the Knot.
τ¹ Hydrae
Tau-1 Hydrae is a binary starBinary star
A binary star is a star system consisting of two stars orbiting around their common center of mass. The brighter star is called the primary and the other is its companion star, comes, or secondary...
lying 56 light years
Light Years
Light Years is the seventh studio album by Australian recording artist Kylie Minogue. It was released on 25 September 2000 by Parlophone and Mushroom Records. The album's style was indicative of her return to "mainstream pop dance tunes"....
from Earth
Earth
Earth is the third planet from the Sun, and the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System's four terrestrial planets...
. It is a spectral type
Stellar classification
In astronomy, stellar classification is a classification of stars based on their spectral characteristics. The spectral class of a star is a designated class of a star describing the ionization of its chromosphere, what atomic excitations are most prominent in the light, giving an objective measure...
F6 main sequence
Main sequence
The main sequence is a continuous and distinctive band of stars that appears on plots of stellar color versus brightness. These color-magnitude plots are known as Hertzsprung–Russell diagrams after their co-developers, Ejnar Hertzsprung and Henry Norris Russell...
star which has an apparent magnitude
Apparent magnitude
The apparent magnitude of a celestial body is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere...
of +4.59.
τ² Hydrae
Tau-2 Hydrae is a spectral typeStellar classification
In astronomy, stellar classification is a classification of stars based on their spectral characteristics. The spectral class of a star is a designated class of a star describing the ionization of its chromosphere, what atomic excitations are most prominent in the light, giving an objective measure...
A3 main sequence
Main sequence
The main sequence is a continuous and distinctive band of stars that appears on plots of stellar color versus brightness. These color-magnitude plots are known as Hertzsprung–Russell diagrams after their co-developers, Ejnar Hertzsprung and Henry Norris Russell...
star which has an apparent magnitude
Apparent magnitude
The apparent magnitude of a celestial body is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere...
of +4.54. It is about 460 light years from Earth
Earth
Earth is the third planet from the Sun, and the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System's four terrestrial planets...
.
Name
According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Uḳdah were the title for four stars :τ¹ Hya as Uḳdah I, τ² Hya as Uḳdah II, 33 Hya (A Hydrae} as Uḳdah III and ι Hya as Uḳdah IVIn Chinese
Chinese language
The Chinese language is a language or language family consisting of varieties which are mutually intelligible to varying degrees. Originally the indigenous languages spoken by the Han Chinese in China, it forms one of the branches of Sino-Tibetan family of languages...
, , meaning Star
Star (Chinese constellation)
The Star mansion is one of the Twenty-eight mansions of the Chinese constellations. It is one of the southern mansions of the Vermilion Bird.- Asterisms :...
(asterism), refers to an asterism consisting of τ¹ Hydra and τ² Hydra, Alphard
Alphard
Alphard is the brightest star in the constellation Hydra. The name Alphard is from the Arabic الفرد , "the solitary one", there being no other bright stars near it. It was also known as the "backbone of the Serpent" to the Arabs. In ancient China it formed part of an asterism called the "red bird"...
, ι Hydrae, 26 Hydrae, 27 Hydrae
27 Hydrae
27 Hydrae is an evolved yellow giant star in the constellation of Hydra. The star is suspected to host a low-mass companion.-Substellar companion:...
, HD 82477 and HD 82428. Consequently, τ¹ Hydra and τ² themself is known as
The Bayer designation
Bayer designation
A Bayer designation is a stellar designation in which a specific star is identified by a Greek letter, followed by the genitive form of its parent constellation's Latin name...
Tau Hydrae (τ Hya, τ Hydrae) is shared by two star system
Star system
A star system or stellar system is a small number of stars which orbit each other, bound by gravitational attraction. A large number of stars bound by gravitation is generally called a star cluster or galaxy, although, broadly speaking, they are also star systems.-Binary star systems:A stellar...
s, τ¹ Hydrae and τ² Hydrae, in the constellation
Constellation
In modern astronomy, a constellation is an internationally defined area of the celestial sphere. These areas are grouped around asterisms, patterns formed by prominent stars within apparent proximity to one another on Earth's night sky....
Hydra
Hydra (constellation)
Hydra is the largest of the 88 modern constellations, measuring 1303 square degrees. It has a long history, having been included among the 48 constellations listed by the 2nd century astronomer Ptolemy. It is commonly represented as a water snake...
. The two stars are separated by 1.74° in the sky.
This star (τ¹ Hya and τ² Hya), along with ι Hya and the 5th‑magnitude 33 Hya (A Hydrae}, were Ptolemy's Καμπή (Kampē); but Kazwini knew them as ʽUḳdah, the Knot.
τ¹ Hydrae
Tau-1 Hydrae is a binary starBinary star
A binary star is a star system consisting of two stars orbiting around their common center of mass. The brighter star is called the primary and the other is its companion star, comes, or secondary...
lying 56 light years
Light Years
Light Years is the seventh studio album by Australian recording artist Kylie Minogue. It was released on 25 September 2000 by Parlophone and Mushroom Records. The album's style was indicative of her return to "mainstream pop dance tunes"....
from Earth
Earth
Earth is the third planet from the Sun, and the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System's four terrestrial planets...
. It is a spectral type
Stellar classification
In astronomy, stellar classification is a classification of stars based on their spectral characteristics. The spectral class of a star is a designated class of a star describing the ionization of its chromosphere, what atomic excitations are most prominent in the light, giving an objective measure...
F6 main sequence
Main sequence
The main sequence is a continuous and distinctive band of stars that appears on plots of stellar color versus brightness. These color-magnitude plots are known as Hertzsprung–Russell diagrams after their co-developers, Ejnar Hertzsprung and Henry Norris Russell...
star which has an apparent magnitude
Apparent magnitude
The apparent magnitude of a celestial body is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere...
of +4.59.
τ² Hydrae
Tau-2 Hydrae is a spectral typeStellar classification
In astronomy, stellar classification is a classification of stars based on their spectral characteristics. The spectral class of a star is a designated class of a star describing the ionization of its chromosphere, what atomic excitations are most prominent in the light, giving an objective measure...
A3 main sequence
Main sequence
The main sequence is a continuous and distinctive band of stars that appears on plots of stellar color versus brightness. These color-magnitude plots are known as Hertzsprung–Russell diagrams after their co-developers, Ejnar Hertzsprung and Henry Norris Russell...
star which has an apparent magnitude
Apparent magnitude
The apparent magnitude of a celestial body is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere...
of +4.54. It is about 460 light years from Earth
Earth
Earth is the third planet from the Sun, and the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System's four terrestrial planets...
.
Name
According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Uḳdah were the title for four stars :τ¹ Hya as Uḳdah I, τ² Hya as Uḳdah II, 33 Hya (A Hydrae} as Uḳdah III and ι Hya as Uḳdah IVIn Chinese
Chinese language
The Chinese language is a language or language family consisting of varieties which are mutually intelligible to varying degrees. Originally the indigenous languages spoken by the Han Chinese in China, it forms one of the branches of Sino-Tibetan family of languages...
, , meaning Star
Star (Chinese constellation)
The Star mansion is one of the Twenty-eight mansions of the Chinese constellations. It is one of the southern mansions of the Vermilion Bird.- Asterisms :...
(asterism), refers to an asterism consisting of τ¹ Hydra and τ² Hydra, Alphard
Alphard
Alphard is the brightest star in the constellation Hydra. The name Alphard is from the Arabic الفرد , "the solitary one", there being no other bright stars near it. It was also known as the "backbone of the Serpent" to the Arabs. In ancient China it formed part of an asterism called the "red bird"...
, ι Hydrae, 26 Hydrae, 27 Hydrae
27 Hydrae
27 Hydrae is an evolved yellow giant star in the constellation of Hydra. The star is suspected to host a low-mass companion.-Substellar companion:...
, HD 82477 and HD 82428. Consequently, τ¹ Hydra and τ² themself is known as
The Bayer designation
Bayer designation
A Bayer designation is a stellar designation in which a specific star is identified by a Greek letter, followed by the genitive form of its parent constellation's Latin name...
Tau Hydrae (τ Hya, τ Hydrae) is shared by two star system
Star system
A star system or stellar system is a small number of stars which orbit each other, bound by gravitational attraction. A large number of stars bound by gravitation is generally called a star cluster or galaxy, although, broadly speaking, they are also star systems.-Binary star systems:A stellar...
s, τ¹ Hydrae and τ² Hydrae, in the constellation
Constellation
In modern astronomy, a constellation is an internationally defined area of the celestial sphere. These areas are grouped around asterisms, patterns formed by prominent stars within apparent proximity to one another on Earth's night sky....
Hydra
Hydra (constellation)
Hydra is the largest of the 88 modern constellations, measuring 1303 square degrees. It has a long history, having been included among the 48 constellations listed by the 2nd century astronomer Ptolemy. It is commonly represented as a water snake...
. The two stars are separated by 1.74° in the sky.
This star (τ¹ Hya and τ² Hya), along with ι Hya and the 5th‑magnitude 33 Hya (A Hydrae}, were Ptolemy's Καμπή (Kampē); but Kazwini knew them as ʽUḳdah, the Knot.
τ¹ Hydrae
Tau-1 Hydrae is a binary starBinary star
A binary star is a star system consisting of two stars orbiting around their common center of mass. The brighter star is called the primary and the other is its companion star, comes, or secondary...
lying 56 light years
Light Years
Light Years is the seventh studio album by Australian recording artist Kylie Minogue. It was released on 25 September 2000 by Parlophone and Mushroom Records. The album's style was indicative of her return to "mainstream pop dance tunes"....
from Earth
Earth
Earth is the third planet from the Sun, and the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System's four terrestrial planets...
. It is a spectral type
Stellar classification
In astronomy, stellar classification is a classification of stars based on their spectral characteristics. The spectral class of a star is a designated class of a star describing the ionization of its chromosphere, what atomic excitations are most prominent in the light, giving an objective measure...
F6 main sequence
Main sequence
The main sequence is a continuous and distinctive band of stars that appears on plots of stellar color versus brightness. These color-magnitude plots are known as Hertzsprung–Russell diagrams after their co-developers, Ejnar Hertzsprung and Henry Norris Russell...
star which has an apparent magnitude
Apparent magnitude
The apparent magnitude of a celestial body is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere...
of +4.59.
τ² Hydrae
Tau-2 Hydrae is a spectral typeStellar classification
In astronomy, stellar classification is a classification of stars based on their spectral characteristics. The spectral class of a star is a designated class of a star describing the ionization of its chromosphere, what atomic excitations are most prominent in the light, giving an objective measure...
A3 main sequence
Main sequence
The main sequence is a continuous and distinctive band of stars that appears on plots of stellar color versus brightness. These color-magnitude plots are known as Hertzsprung–Russell diagrams after their co-developers, Ejnar Hertzsprung and Henry Norris Russell...
star which has an apparent magnitude
Apparent magnitude
The apparent magnitude of a celestial body is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere...
of +4.54. It is about 460 light years from Earth
Earth
Earth is the third planet from the Sun, and the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System's four terrestrial planets...
.
Name
According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Uḳdah were the title for four stars :τ¹ Hya as Uḳdah I, τ² Hya as Uḳdah II, 33 Hya (A Hydrae} as Uḳdah III and ι Hya as Uḳdah IVIn Chinese
Chinese language
The Chinese language is a language or language family consisting of varieties which are mutually intelligible to varying degrees. Originally the indigenous languages spoken by the Han Chinese in China, it forms one of the branches of Sino-Tibetan family of languages...
, , meaning Star
Star (Chinese constellation)
The Star mansion is one of the Twenty-eight mansions of the Chinese constellations. It is one of the southern mansions of the Vermilion Bird.- Asterisms :...
(asterism), refers to an asterism consisting of τ¹ Hydra and τ² Hydra, Alphard
Alphard
Alphard is the brightest star in the constellation Hydra. The name Alphard is from the Arabic الفرد , "the solitary one", there being no other bright stars near it. It was also known as the "backbone of the Serpent" to the Arabs. In ancient China it formed part of an asterism called the "red bird"...
, ι Hydrae, 26 Hydrae, 27 Hydrae
27 Hydrae
27 Hydrae is an evolved yellow giant star in the constellation of Hydra. The star is suspected to host a low-mass companion.-Substellar companion:...
, HD 82477 and HD 82428. Consequently, τ¹ Hydra and τ² themself is known as (, the Second Star of Star and (, the Third Star of Star.)