| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Carina |
| Right ascension | 09h47m06.1s |
| Declination | -65°04′19″ |
| Apparent magnitude (V) | +3.01/+6.26 |
| Characteristics | |
| Spectral type | A6Ib/B7III |
| U−B color index | 0.18 |
| B−V color index | 0.28 |
| Variable type | none |
| Astrometry | |
| Radial velocity (Rv) | 14 km/s |
| Proper motion (μ) | RA: -11.55 mas/yr Dec.: 4.97 mas/yr |
| Parallax (π) | 2.01 ± 0.40 mas |
| Distance | approx. 1600 ly (approx. 500 pc) |
| Absolute magnitude (MV) | −5.56 |
| Other designations | |
Upsilon Carinae (υ Car, υ Carinae) is a binary star in the constellation Carina. It is part of the Diamond Cross asterism in southern Carina.
The Upsilon Carinae system has a combined apparent magnitude of +2.92 and is approximately 1623 light years from Earth.
In Chinese, 海石 (Hǎi Dàn), meaning Sea Rock, refers to an asterism consisting of υ Carinae, ε Carinae, ι Carinae, HD 83183 and HD 84810.[1] Consequently, υ Carinae itself is known as 海石五 (Hǎi Dàn wǔ, English: the Fifth Star of Sea Rock.)[2]
The primary component, υ Carinae A, is a white A-type supergiant with an apparent magnitude of +3.01. The companion, υ Carinae B, is a blue-white B-type giant with an apparent magnitude of +6.26. The two stars are 5 arcseconds apart.
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