Delta Cassiopeiae
Encyclopedia
Delta Cassiopeiae (δ Cas, δ Cassiopeiae) is a star
in the constellation
Cassiopeia
. It has the traditional names Ksora and Ruchbah, derived from the Arabic
word ركبة rukbah meaning "knee". It is not to be confused with Alpha Sagittarii
, which also is called Ruchbah or Rukbat, from the Arabic word ركبة rukbah meaning "knee".
In Chinese
, , meaning Flying Corridor
, refers to an asterism consisting of δ Cassiopeiae, ι Cassiopeiae
, ε Cassiopeiae
, θ Cassiopeiae
, ν Cassiopeiae
and ο Cassiopeiae
. Consequently, δ Cassiopeiae itself is known as
Delta Cassiopeiae is an eclipsing binary with a period of 460 days. Its apparent magnitude
varies between +2.68 mag and +2.74. It is of spectral class
A3, and is approximately 99 light years from Earth
.
Star
A star is a massive, luminous sphere of plasma held together by gravity. At the end of its lifetime, a star can also contain a proportion of degenerate matter. The nearest star to Earth is the Sun, which is the source of most of the energy on Earth...
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....
Cassiopeia
Cassiopeia (constellation)
Cassiopeia is a constellation in the northern sky, named after the vain queen Cassiopeia in Greek mythology, who boasted about her unrivalled beauty. Cassiopea was one of the 48 constellations listed by the 2nd century Greek astronomer Ptolemy, and it remains one of the 88 modern constellations today...
. It has the traditional names Ksora and Ruchbah, derived from the Arabic
Arabic language
Arabic is a name applied to the descendants of the Classical Arabic language of the 6th century AD, used most prominently in the Quran, the Islamic Holy Book...
word ركبة rukbah meaning "knee". It is not to be confused with Alpha Sagittarii
Alpha Sagittarii
Alpha Sagittarii is a star in the Sagittarius constellation. It has the traditional names 天淵三 , Alrami and Rukbat, derived from the Arabic rukbat al-rāmī = the knee of the archer...
, which also is called Ruchbah or Rukbat, from the Arabic word ركبة rukbah meaning "knee".
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 Flying Corridor
Legs (Chinese constellation)
The Legs mansion is one of the Twenty-eight mansions of the Chinese constellations. It is one of the western mansions of the White Tiger.-Asterisms:...
, refers to an asterism consisting of δ Cassiopeiae, ι Cassiopeiae
Iota Cassiopeiae
Iota Cassiopeiae is a star system in the constellation Cassiopeia. It is approximately 141.6 light years from Earth....
, ε Cassiopeiae
Epsilon Cassiopeiae
Epsilon Cassiopeiae is a star system in the constellation Cassiopeia. It has the traditional name Segin....
, θ Cassiopeiae
Theta Cassiopeiae
Theta Cassiopeiae is a star in the constellation Cassiopeia. It has the traditional name Marfark or Marfak, which it shares with μ Cassiopeiae, and the name was from Al Marfik or Al Mirfaq , meaning "the elbow".In Chinese, , meaning Flying Corridor, refers to an asterism consisting of θ...
, ν Cassiopeiae
Nu Cassiopeiae
Nu Cassiopeiae is a star in the constellation Cassiopeia. ν Cassiopeiae is a blue-white B-type giant with an apparent magnitude of +4.90. It is approximately 390 light years from Earth....
and ο Cassiopeiae
Omicron Cassiopeiae
Omicron Cassiopeiae is a triple star system in the constellation Cassiopeia. It is approximately 910 light years from Earth....
. Consequently, δ Cassiopeiae itself is known as
Delta Cassiopeiae is an eclipsing binary with a period of 460 days. Its 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...
varies between +2.68 mag and +2.74. It is of spectral class
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...
A3, and is approximately 99 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...
.