Delta Arae

Delta Arae
δ Arae
Ara constellation map.png
δ Arae (lower center) in the Ara Constellation
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Ara
Right ascension 17h 31m 05.913s
Declination -60° 41′ 1.853″
Apparent magnitude (V) 3.6
Characteristics
Spectral type B8Vn
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)
Absolute magnitude (MV) 3.52
Details
Mass 18 M
Radius 7 R
Luminosity 20,000 L
Temperature 10,000–30,000 K
Rotation 260 Km/s
Other designations
HD 158094, HIP 85727, SAO 253945, FK5 648, HR 6500.
Database references
SIMBAD data
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

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.

Delta Arae was known as 龜三 (meaning: "the 3rd (star) of Guī") in traditional Chinese astronomy.[1][2]

Allen erroneously called it with ζ Arae as Tseen Yin (天陰).[3] He probably confused constellation "Ara" with "Ari". Tseen Yin was lain[clarification needed] in Aries.[1][2]

Contents

Notes

  1. ^ 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.
  2. ^ a b 伊世同 (Yi Shi Tong) (1981): 『中西対照恒星図表』科学出版社.(Chinese)
  3. ^ Allen, R. H., (1963). Star Names: Their Lore and Meaning (Reprint ed.). New York, NY: Dover Publications Inc.. p. 64. ISBN 0486210790. [1]

References

  • 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)

External links

See also

  • Ara (Chinese astronomy)
  • Aries (Chinese astronomy)

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