HD 72108

This article is about A Velorum. For a Velorum, see HD 75063.

HD 72108 (A Vel, A Velorum) is a star system in the constellation Vela. It is approximately 1640 light years from Earth.

HD 72108

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
Companion	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.