P Velorum

p Velorum (abbreviated to p Vel) is a triple star system in the constellation Vela. Parallax measurements by the Hipparcos spacecraft put it at a distance of 87.5 light-years, or 26.8 parsecs from Earth.^[1] It is visible to the naked eye with a combined apparent magnitude of 3.83.^[2]

p Velorum

Observation data Epoch J2000      Equinox J2000
Constellation	Vela
Right ascension	10h 37m 18.13995s[1]
Declination	−48° 13′ 32.2349″[1]
Apparent magnitude (V)	3.83[2] (4.13 / 5.76)[3]
Characteristics
Spectral type	F3IV + F0V + A6V[2]
U−B color index	+0.04[2]
B−V color index	+0.31[2]
Astrometry
Radial velocity (Rv)	21.20 ± 0.7[4] km/s
Proper motion (μ)	RA: -133.41[1] mas/yr Dec.: -1.82[1] mas/yr
Parallax (π)	37.26±0.36 mas[1]
Distance	87.5 ± 0.8 ly (26.8 ± 0.3 pc)
Absolute magnitude (MV)	2.15 / 2.70 / 2.14[2]
Orbit[3]
Primary	p Vel A
Companion	p Vel B
Period (P)	16.651 yr
Semi-major axis (a)	0.361″
Eccentricity (e)	0.726
Inclination (i)	128.5°
Longitude of the node (Ω)	37.2°
Periastron epoch (T)	2019.562
Argument of periastron (ω) (secondary)	288.9°
Details[5]
p Vel Aa
Mass	1.88 M☉
Radius	2.56[a] R☉
Luminosity	12.5 L☉
Temperature	6,710 K
p Vel Ab
Mass	1.29 M☉
Radius	1.22[a] R☉
Luminosity	2.79 L☉
Temperature	6,740 K
p Vel B
Mass	2.41[2] M☉
Other designations
CD−47°6042, HIP 51986, HR 4167, SAO 222199
p Vel A: HD 92139
p Vel B: HD 92140
Database references
SIMBAD	data

The primary component is a spectroscopic binary whose components have an orbital period of 10.21 days. The inner spectroscopic binary consists of two F-type stars, a subgiant and a main-sequence star.^[2] There is a companion star which is a white A-type main-sequence star, with an apparent magnitude of 5.76.^[3] It is separated 0.361 arcseconds from the primary and has an orbital period of 16.651 years.^[3]

Notes

1. Calculated, using the Stefan-Boltzmann law and the star's effective temperature and luminosity, with respect to the solar nominal effective temperature of 5,772 K:$${\displaystyle {\sqrt {{\biggl (}{\frac {5,772}{6,710}}{\biggr )}^{4}\cdot 12.535}}=2.56\ R_{\odot }.}$$$${\displaystyle {\sqrt {{\biggl (}{\frac {5,772}{6,740}}{\biggr )}^{4}\cdot 2.79}}=1.22\ R_{\odot }.}$$