HD 72108
Star system in the constellation Vela
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HD 72108 (A Vel, A Velorum) is a star system in the constellation Vela. It is approximately 1640 light years from Earth.
Right ascension08h 29m 04.752s[2]
Declination−47° 55′ 44.12″[2]
Apparentmagnitude(V)+5.33[citation needed]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Vela[1] |
| Right ascension | 08h 29m 04.752s[2] |
| Declination | −47° 55′ 44.12″[2] |
| Apparent magnitude (V) | +5.33[citation needed] |
| Characteristics | |
| Spectral type | B2IV + B2IV[3] |
| Astrometry | |
| Radial velocity (Rv) | 29.00±3.7[4] km/s |
| Proper motion (μ) | RA: −6.90±0.43[2] mas/yr Dec.: +7.12±0.34[2] mas/yr |
| Parallax (π) | 1.53±0.34 mas[2] |
| Distance | approx. 2,100 ly (approx. 700 pc) |
| Absolute magnitude (MV) | −1.06[citation needed] |
| Orbit[5] | |
| Primary | HD 72018 Aa |
| Name | HD 72018 Ab |
| Period (P) | 340±50 yr |
| Semi-major axis (a) | 0.427±0.030″ |
| Eccentricity (e) | 0.748±0.030 |
| Inclination (i) | 78.9±2.0° |
| Longitude of the node (Ω) | 114.7±2.0° |
| Periastron epoch (T) | 1947.7±2.0 |
| Argument of periastron (ω) (secondary) | 300.0±5.0° |
| Details | |
| HD 72018 Aa | |
| Mass | 6.08±3.43[5] M☉ |
| HD 72018 Ab | |
| Mass | 5.45±3.08[5] M☉ |
| Other designations | |
| HR 3358, CD−47°4004, HIP 41616, SAO 219985, WDS J08291-4756AB[6] | |
| Database references | |
| SIMBAD | data |
The primary component, HD 72108 A, is a blue-white B-type subgiant with an apparent magnitude of +5.33. It is a spectroscopic binary, whose components are separated by 0.176 arcseconds. At a distance of 4 arcseconds away is the third component, the magnitude +7.7 HD 72108 B. The fourth component, HD 72108 C has an apparent magnitude of +9.3, and is 19 arcseconds from the primary.
