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HD 76805 
Summary
H Velorum is a triple star system in the constellation Vela, at a distance of approximately 390 light years.
| 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] |
| Distance | 380 ± 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] |
| 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[4] M☉ |
| Temperature | 16,000[2] K |
| Rotational velocity (v sin i) | 50[2] km/s |
| Ab | |
| Mass | 0.59[4] M☉ |
| Temperature | 9,500[2] K |
| B | |
| Mass | 1.55[4] M☉ |
| Temperature | 8,871[3] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
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 edit
- ^ a b c d e 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.
- ^ a b c d e 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. hdl:11336/4892.
- ^ a b c d 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.
- ^ a b c "Multiple Star Catalog". Multiple Star Catalog. Retrieved 2019-10-06.[permanent dead link]
- ^ "HD 76805". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-10-06.