Astronomy:HD 76805
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Short description: Triple star system in the constellation Vela
  | |
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Vela[1] |
| Right ascension | 08h 56m 19.2615s[2] |
| Declination | −52° 43′ 24.506″[2] |
| Apparent magnitude (V) | 4.70[citation needed] |
| Characteristics | |
| Spectral type | B5V + B9.5V[3] |
| Astrometry | |
| A | |
| Proper motion (μ) | RA: −15.386±0.588[2] mas/yr Dec.: 14.468±0.524[2] mas/yr |
| Parallax (π) | 8.5823 ± 0.3177[2] mas |
| Distance | 380 ± 10 ly (117 ± 4 pc) |
| B | |
| Proper motion (μ) | RA: −17.787±0.271[4] mas/yr Dec.: 12.031±0.250[4] mas/yr |
| Parallax (π) | 8.1722 ± 0.1358[4] mas |
| Distance | 399 ± 7 ly (122 ± 2 pc) |
| Orbit | |
| Primary | Aa |
| Companion | Ab |
| 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 | |
| Mass | 4.14[5] M☉ |
| Temperature | 16,000[3] K |
| Rotational velocity (v sin i) | 50[3] km/s |
| Ab | |
| Mass | 0.59[5] M☉ |
| Temperature | 9,500[3] K |
| B | |
| Mass | 1.55[5] M☉ |
| Temperature | 8,871[4] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 76805, also known as H Velorum, is a triple star system in the constellation Vela, at a distance of approximately 390 light years.
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.[3]
References
- ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific 99 (617): 695. doi:10.1086/132034. Bibcode: 1987PASP...99..695R Constellation record for this object at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 3.0 3.1 3.2 3.3 3.4 Veramendi, M. E.; González, J. F. (2014). "Spectroscopic study of early-type multiple stellar systems". Astronomy and Astrophysics 563: A138. doi:10.1051/0004-6361/201322840. Bibcode: 2014A&A...563A.138V. https://www.aanda.org/articles/aa/full_html/2014/03/aa22840-13/aa22840-13.html.
- ↑ 4.0 4.1 4.2 4.3 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 5.0 5.1 5.2 "Multiple Star Catalog". http://www.ctio.noao.edu/~atokovin/stars/stars.php?cat=HR&number=3574.
- ↑ "HD 76805". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+76805.
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