Delta Serpentis
Encyclopedia
Delta Serpentis is a star system
in the constellation
Serpens
, in its head (Serpens Caput). It was a member of indigenous Arabic asterism
al-Nasaq al-Yamānī, "the Southern Line" of al-Nasaqān "the Two Lines"., along with α Ser
(Unukalhai), ε Ser
(Ba, Pa), δ Oph
(Yed Prior), ε Oph
(Yed Posterior), ζ Oph
(Han) and γ Oph
(Tsung Ching).
According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, al-Nasaq al-Yamānī or Nasak Yamani were the title for two stars :δ Ser as Nasak Yamani I and ε Ser
as Nasak Yamani II (exclude α Ser
, δ Oph
, ε Oph
, ζ Oph
and γ Oph
)
In Chinese
, , meaning Right Wall of Heavenly Market Enclosure
, refers to an asterism which is represent eleven old states in China which is marking the right borderline of the enclosure, consisting of δ Serpentis, β Herculis
, γ Herculis
, κ Herculis
, γ Serpentis, β Serpentis
, α Serpentis
, ε Serpentis
, δ Ophiuchi
, ε Ophiuchi
and ζ Ophiuchi
. Consequently, δ Serpentis itself is known as , represent the state Qin
(秦) (or Tsin), together with θ Capricorni
and 30 Capricorni in Twelve States
(asterism).
from Earth
. The light from the four stars in the system give a combined apparent magnitude
of +3.80.
The system consists of a pair of binary stars separated by 66 arcseconds. The primary component, Delta Serpentis A, is a yellow-white F-type
subgiant with an apparent magnitude
of +4.2. It is classified as a Delta Scuti type
variable star
and its magnitude varies by 0.04 with a period of 0.134 days. Its binary companion, Delta Serpentis B, is also a F-type subgiant which is slightly dimmer, with a magnitude of +5.2. A and B are separated by four arcseconds on the sky, and perform one orbit around their centre of mass once every 3200 years. The 14th magnitude stars Delta Serpentis C and 15th magnitude Delta Serpentis D form the second binary sub-system. They are separated from each other by 4.4 arcseconds.
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...
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....
Serpens
Serpens
Serpens is a constellation of the northern hemisphere. It was one of the 48 constellations listed by the 2nd century astronomer Ptolemy and it remains one of the 88 modern constellations defined by the International Astronomical Union....
, in its head (Serpens Caput). It was a member of indigenous Arabic asterism
Asterism (astronomy)
In astronomy, an asterism is a pattern of stars recognized on Earth's night sky. It may form part of an official constellation, or be composed of stars from more than one. Like constellations, asterisms are in most cases composed of stars which, while they are visible in the same general direction,...
al-Nasaq al-Yamānī, "the Southern Line" of al-Nasaqān "the Two Lines"., along with α Ser
Alpha Serpentis
Alpha Serpentis is a triple star system in the constellation Serpens, in its head . Alpha Serpentis has the proper names Unukalhai, from the Arabic عنق الحية ‘Unuq al-Ħayyah "the Serpent's Neck", and Cor Serpentis from the Latin "the Heart of the Serpent"...
(Unukalhai), ε Ser
Epsilon Serpentis
Epsilon Serpentis is a star in the constellation Serpens, in its head .It was a member of indigenous Arabic asterism al-Nasaq al-Yamānī, "the Southern Line" of al-Nasaqān "the Two Lines"., along with α Ser , δ Ser , δ Oph , ε Oph , ζ Oph and γ Oph .According to the...
(Ba, Pa), δ Oph
Delta Ophiuchi
Delta Ophiuchi is a star in the constellation Ophiuchus. It has the traditional name Yed Prior ....
(Yed Prior), ε Oph
Epsilon Ophiuchi
Epsilon Ophiuchi is a star in the constellation Ophiuchus. It has the traditional name Yed Posterior ....
(Yed Posterior), ζ Oph
Zeta Ophiuchi
Zeta Ophiuchi is a star located in the constellation of Ophiuchus. It was a member of indigenous Arabic asterism al-Nasaq al-Yamānī, "the Southern Line" of al-Nasaqān "the Two Lines"., along with α Ser , δ Ser , ε Ser , δ Oph , ε Ser and γ Oph .According to the catalogue of stars...
(Han) and γ Oph
Gamma Ophiuchi
Gamma Ophiuchi is a Class A4, fourth-magnitude star in the constellation Ophiuchus. Gamma Ophiuchi is a stellar system located about 95 light-years from Earth....
(Tsung Ching).
According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, al-Nasaq al-Yamānī or Nasak Yamani were the title for two stars :δ Ser as Nasak Yamani I and ε Ser
Epsilon Serpentis
Epsilon Serpentis is a star in the constellation Serpens, in its head .It was a member of indigenous Arabic asterism al-Nasaq al-Yamānī, "the Southern Line" of al-Nasaqān "the Two Lines"., along with α Ser , δ Ser , δ Oph , ε Oph , ζ Oph and γ Oph .According to the...
as Nasak Yamani II (exclude α Ser
Alpha Serpentis
Alpha Serpentis is a triple star system in the constellation Serpens, in its head . Alpha Serpentis has the proper names Unukalhai, from the Arabic عنق الحية ‘Unuq al-Ħayyah "the Serpent's Neck", and Cor Serpentis from the Latin "the Heart of the Serpent"...
, δ Oph
Delta Ophiuchi
Delta Ophiuchi is a star in the constellation Ophiuchus. It has the traditional name Yed Prior ....
, ε Oph
Epsilon Ophiuchi
Epsilon Ophiuchi is a star in the constellation Ophiuchus. It has the traditional name Yed Posterior ....
, ζ Oph
Zeta Ophiuchi
Zeta Ophiuchi is a star located in the constellation of Ophiuchus. It was a member of indigenous Arabic asterism al-Nasaq al-Yamānī, "the Southern Line" of al-Nasaqān "the Two Lines"., along with α Ser , δ Ser , ε Ser , δ Oph , ε Ser and γ Oph .According to the catalogue of stars...
and γ Oph
Gamma Ophiuchi
Gamma Ophiuchi is a Class A4, fourth-magnitude star in the constellation Ophiuchus. Gamma Ophiuchi is a stellar system located about 95 light-years from Earth....
)
In 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 Right Wall of Heavenly Market Enclosure
Heavenly Market enclosure
Tian Shi Yuan, the Heavenly Market Enclosure , is one of the San Yuan or Three enclosures. Stars and constellations of this group are visible during late summer and early autumn in the Northern Hemisphere . The summer triangle lies directly to the northwest.-Asterisms:The asterisms are :...
, refers to an asterism which is represent eleven old states in China which is marking the right borderline of the enclosure, consisting of δ Serpentis, β Herculis
Beta Herculis
Beta Herculis , which also has the name Kornephoros, is the brightest star in the constellation of Hercules. It has an apparent visual magnitude which varies between 2.76 and 2.81.Although β Herculis appears to the naked eye to be a single star, W. W...
, γ Herculis
Gamma Herculis
Gamma Herculis is a magnitude 3.74 binary star in the constellation Hercules. It is a giant star with a stellar classification of A9III that is located at a distance of about 195 light years from the Earth.-Name:...
, κ Herculis
Kappa Herculis
Kappa Herculis is a double star in the constellation Hercules. Traditional names that have been attributed to the star are "Marfik", "Marfak" or "Marsic", all of which come from the Arabic لمرفق Al-Mirfaq meaning "the elbow", a name it shares with Lambda Ophiuchi.- Properties :Kappa Herculis is a...
, γ Serpentis, β Serpentis
Beta Serpentis
Beta Serpentis is a star system in the constellation Serpens, in its head . It was a member of indigenous Arabic asterism al-Nasaq al-Sha'āmī, "the Northern Line" of al-Nasaqān "the Two Lines", along with β Her , γ Her and γ Ser .According to the catalogue of stars in the Technical Memorandum...
, α Serpentis
Alpha Serpentis
Alpha Serpentis is a triple star system in the constellation Serpens, in its head . Alpha Serpentis has the proper names Unukalhai, from the Arabic عنق الحية ‘Unuq al-Ħayyah "the Serpent's Neck", and Cor Serpentis from the Latin "the Heart of the Serpent"...
, ε Serpentis
Epsilon Serpentis
Epsilon Serpentis is a star in the constellation Serpens, in its head .It was a member of indigenous Arabic asterism al-Nasaq al-Yamānī, "the Southern Line" of al-Nasaqān "the Two Lines"., along with α Ser , δ Ser , δ Oph , ε Oph , ζ Oph and γ Oph .According to the...
, δ Ophiuchi
Delta Ophiuchi
Delta Ophiuchi is a star in the constellation Ophiuchus. It has the traditional name Yed Prior ....
, ε Ophiuchi
Epsilon Ophiuchi
Epsilon Ophiuchi is a star in the constellation Ophiuchus. It has the traditional name Yed Posterior ....
and ζ Ophiuchi
Zeta Ophiuchi
Zeta Ophiuchi is a star located in the constellation of Ophiuchus. It was a member of indigenous Arabic asterism al-Nasaq al-Yamānī, "the Southern Line" of al-Nasaqān "the Two Lines"., along with α Ser , δ Ser , ε Ser , δ Oph , ε Ser and γ Oph .According to the catalogue of stars...
. Consequently, δ Serpentis itself is known as , represent the state Qin
Qin (state)
The State of Qin was a Chinese feudal state that existed during the Spring and Autumn and Warring States Periods of Chinese history...
(秦) (or Tsin), together with θ Capricorni
Theta Capricorni
Theta Capricorni is a star in the constellation Capricornus. θ Capricorni is a white A-type main sequence dwarf with an apparent magnitude of +4.08...
and 30 Capricorni in Twelve States
Girl (Chinese constellation)
The Girl mansion is one of the Twenty-eight mansions of the Chinese constellations. It is one of the northern mansions of the Black Tortoise.- Asterisms :...
(asterism).
Properties
It is approximately 210 light yearsLight 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...
. The light from the four stars in the system give a combined 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 +3.80.
The system consists of a pair of binary stars separated by 66 arcseconds. The primary component, Delta Serpentis A, is a yellow-white F-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...
subgiant with 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 +4.2. It is classified as a Delta Scuti type
Delta Scuti variable
A Delta Scuti variable is a variable star which exhibits variations in its luminosity due to both radial and non-radial pulsations of the star's surface. Typical brightness fluctuations are from 0.003 to 0.9 magnitudes in V over a period of a few hours, although the amplitude and period of the...
variable star
Variable star
A star is classified as variable if its apparent magnitude as seen from Earth changes over time, whether the changes are due to variations in the star's actual luminosity, or to variations in the amount of the star's light that is blocked from reaching Earth...
and its magnitude varies by 0.04 with a period of 0.134 days. Its binary companion, Delta Serpentis B, is also a F-type subgiant which is slightly dimmer, with a magnitude of +5.2. A and B are separated by four arcseconds on the sky, and perform one orbit around their centre of mass once every 3200 years. The 14th magnitude stars Delta Serpentis C and 15th magnitude Delta Serpentis D form the second binary sub-system. They are separated from each other by 4.4 arcseconds.