Delta Arae
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 δ Arae (lower center) in the Ara Constellation |
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| Observation data Epoch J2000.0 Equinox J2000.0 |
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|---|---|
| Constellation | Ara |
| Right ascension | 17h 31m 05.913s |
| Declination | -60° 41′ 1.853″ |
| Apparent magnitude (V) | 3.6[1] |
| Characteristics | |
| Spectral type | B8 Vn |
| U−B color index | -0.31 |
| B−V color index | -0.1 |
| Astrometry | |
| Radial velocity (Rv) | +10 km/s |
| Proper motion (μ) | RA: -53.65 mas/yr Dec.: -99.37 mas/yr |
| Parallax (π) | 17.42 ± 0.73 mas |
| Distance | 187 ± 8 ly (57 ± 2 pc) |
| Details | |
| Radius | 3.12 ± 0.15[2] R☉ |
| Surface gravity (log g) | 3.81 ± 0.06[2] |
| Temperature | 11,962 ± 86[2] K |
| Age | 125[1] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) |
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Delta Arae (δ Arae, δ Ara) is a double star in the constellation Ara.
Delta Arae is a blue-white B-type main sequence star with an apparent magnitude of 3.60m. It is 187 light years from the Earth. It has a 12th magnitude optical companion located 47.4 arcseconds away along a position angle of 313°.[1]
Delta Arae was known as 龜三 (meaning: "the 3rd (star) of Guī") in traditional Chinese astronomy.[3][4]
Allen erroneously called it with ζ Arae as Tseen Yin (天陰).[5] He probably confused constellation "Ara" with "Ari". Tseen Yin was lain[clarification needed] in Aries.[3][4]
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[edit] See also
[edit] References
- ^ a b c Ehrenreich, D. et al. (November 2010), "Deep infrared imaging of close companions to austral A- and F-type stars", Astronomy and Astrophysics 523: A73, Bibcode 2010A&A...523A..73E, doi:10.1051/0004-6361/201014763
- ^ a b c Fitzpatrick, E. L.; Massa, D. (March 2005), "Determining the Physical Properties of the B Stars. II. Calibration of Synthetic Photometry", The Astronomical Journal 129 (3): 1642–1662, arXiv:astro-ph/0412542, Bibcode 2005AJ....129.1642F, doi:10.1086/427855
- ^ a b Chevalier, S., and Tsuchihashi, P., (1911): "Catalogue d'Étoiles fixes, observés a Pekin sous l'Empereur Kien Long (Qianlong (Chien-Lung)), XVIIIe siecle", Annales de l'Observatoire Astronomique de Zô-Sé.
- ^ a b 伊世同 (Yi Shi Tong) (1981): 『中西対照恒星図表』科学出版社.(Chinese)
- ^ Allen, R. H., (1963). Star Names: Their Lore and Meaning (Reprint ed.). New York, NY: Dover Publications Inc.. p. 64. ISBN 0486210790.[1]
[edit] Further reading
- 大崎正次 (1987): 「中国の星座・星名の同定一覧表」『中国の星座の歴史』 雄山閣出版, pp. 312, 328.(Japanese)
[edit] External links
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