Delta Arae
From Wikipedia, the free encyclopedia
 Ara Constellation |
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| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| 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 |
| Metallicity | ? |
| Rotation | 260 Km/s 0,00373685 Year |
| Age | ? years |
| Orbit | |
| Companion | IDS 17221-6036 B |
| Semimajor axis (a) | 49.1" |
| Inclination (i) | 320° |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) |
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Delta Arae or Tseen Yin (δ Ara / δ Arae) is a star in the constellation Ara.
The name Tseen Yin is from Chinese 天陰 (Mandarin: tiānyīn) "The Dark Sky".
Delta Arae is a blue-white B-type main sequence dwarf with an apparent magnitude of +3.60. It is approximately 187 light years from Earth. It has a 12th magnitude optical companion designated δ Arae B, which is 47.4 arcseconds away.
[edit] Components
| NAME | Right ascension | Declination | Apparent magnitude (V) | Spectral type | Database references |
|---|---|---|---|---|---|
| IDS 17221-6036 B (CPD-60 6842B) | 17h 31m 01.5s | -60° 40' 22 | 11.8 | Simbad |
[edit] References
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