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]
Distance87.5 ± 0.8 ly
(26.8 ± 0.3 pc)
Absolute magnitude (MV)2.15 / 2.70 / 2.14[2]
Orbit[3]
Primaryp Vel A
Companionp 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[2]
p Vel Aa
Mass2.13 M☉
p Vel Ab
Mass1.81 M☉
p Vel B
Mass2.41 M☉
Other designations
CD−47° 6042, HIP 51986, HR 4167, SAO 222199
p Vel A: HD 92139
p Vel B: HD 92140
Database references
SIMBADdata

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]

References
  1. van Leeuwen, F.; et al. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
  2. Evans, D. S. (1969). "A Rediscussion of p Velorum". Monthly Notices of the Royal Astronomical Society. 142 (4): 523–541. Bibcode:1969MNRAS.142..523E. doi:10.1093/mnras/142.4.523.
  3. "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 2017-08-01. Retrieved 2017-07-16.
  4. Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.


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