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Suggest pagesDelta Virginis
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Virgo |
| Right ascension | 12h 55m 36.2s |
| Declination | +3° 23′ 51″ |
| Apparent magnitude (V) | 3.38 |
| Characteristics | |
| Spectral type | M3+ III |
| U−B color index | 1.78 |
| B−V color index | 1.58 |
| Variable type | Semiregular |
| Astrometry | |
| Radial velocity (Rv) | -17.8 km/s |
| Proper motion (μ) | RA: -471.44 mas/yr Dec.: -52.81 mas/yr |
| Parallax (π) | 16.11 ± 0.88 mas |
| Distance | 202 ly (62 pc) |
| Absolute magnitude (MV) | -0.58 |
| Details | |
| Mass | 1.5-2 M☉ |
| Radius | 65 R☉ |
| Luminosity | 630 L☉ |
| Temperature | 3,720 K |
| Metallicity | ? |
| Rotation | ? |
| Age | ? years |
| Other designations | |
Delta Virginis (δ Vir, δ Virginis) is a red giant star in the constellation Virgo. It also has the traditional name Auva.
It has a spectral type of M3-III, and an magnitude of 3.38, bright enough to be seen with the naked eye. It is classified as a semiregular variable star and its brightness varies from magnitude +3.32 to +3.40.
Delta Virginis is a possible binary star, as an 11th magnitude star is located only 80 arcseconds from it. This type K dwarf is believed to have an orbital period of over 200,000 years, but this has not been confirmed.
[edit] Etymology
The medieval names Auva, Al Awwa, and Minelauva are from the Arabic عوى cawwa’ "barking (dog)".
This star, along with β Vir(Zavijava), γ Vir (Porrima), η Vir (Zaniah) and ε Vir (Vindemiatrix), were Al ʽAwwāʼ, the Barker.[1]
In Chinese, 太微左垣 (Tài Wēi Zuǒ Yuán), meaning Left Wall of Supreme Palace Enclosure, refers to an asterism consisting of δ Virginis, η Virginis, γ Virginis, ε Virginis and α Comae Berenices.[2] Consequently, δ Virginis itself is known as 太微左垣三 (Tài Wēi Zuǒ Yuán sān, English: the Third Star of Left Wall of Supreme Palace Enclosure.),[3] representing 東次相 (Dōngcìxiāng), meaning The Second Eastern Minister.[4] 東次相 (Dōngcìxiāng), westernized into Tsze Seang by R.H. Allen and the meaning is "the Second Minister of State" [5]
[edit] References
- ^ Allen, R. H. (1963). Star Names: Their Lore and Meaning (Reprint ed.). New York, NY: Dover Publications Inc. p. 469. ISBN 0486210790. http://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Virgo*.html. Retrieved 2010-12-12.
- ^ (Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 9789867332257.
- ^ (Chinese) 香港太空館 - 研究資源 - 亮星中英對照表, Hong Kong Space Museum. Accessed on line November 23, 2010.
- ^ (Chinese) English-Chinese Glossary of Chinese Star Regions, Asterisms and Star Name, Hong Kong Space Museum. Accessed on line November 23, 2010.
- ^ Richard Hinckley Allen: Star Names — Their Lore and Meaning: Virgo
[edit] External links
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