HD 76805

H Velorum is a triple star system in the constellation Vela, at a distance of approximately 390 light years.

HD 76805
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Vela
Right ascension 08h 56m 19.2615s[1]
Declination −52° 43′ 24.5059″[1]
Apparent magnitude (V) 4.70
Characteristics
Spectral type B5V + B9.5V[2]
Astrometry
A
Proper motion (μ) RA: −15.386±0.588[1] mas/yr
Dec.: 14.468±0.524[1] mas/yr
Parallax (π)8.5823 ± 0.3177 mas[1]
Distance380 ± 10 ly
(117 ± 4 pc)
B
Proper motion (μ) RA: −17.787±0.271[3] mas/yr
Dec.: 12.031±0.250[3] mas/yr
Parallax (π)8.1722 ± 0.1358 mas[3]
Distance399 ± 7 ly
(122 ± 2 pc)
Orbit
PrimaryAa
CompanionAb
Period (P)1.097654
Eccentricity (e)0
Semi-amplitude (K1)
(primary)		48.7 km/s
Semi-amplitude (K2)
(secondary)		92.8 km/s
Details
Aa
Mass4.14[4] M☉
Temperature16,000[2] K
Rotational velocity (v sin i)50[2] km/s
Ab
Mass0.59[4] M☉
Temperature9,500[2] K
B
Mass1.55[4] M☉
Temperature8,871[3] K
Other designations
H Vel, CPD−52 1788, HD 76805, HIP 43878, HR 3574, SAO 236417[5]
Database references
SIMBADdata

A visual pair of stars with magnitudes 4.7 and 8.0 are separated by 2.7″. Their estimated orbital period is 646,000 years. The primary is a spectroscopic binary with two B-class main sequence stars in a 1.1-day orbit.[2]

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. Veramendi, M. E.; González, J. F. (2014). "Spectroscopic study of early-type multiple stellar systems". Astronomy and Astrophysics. 563. A138. Bibcode:2014A&A...563A.138V. doi:10.1051/0004-6361/201322840.
  3. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  4. "Multiple Star Catalog". Multiple Star Catalog. Retrieved 2019-10-06.
  5. "HD 76805". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-10-06.


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