HD 76805

HD 76805
	Location of HD 76805 (circled in red)
Observation data; Epoch J2000.0 Equinox ICRS
Constellation	Vela
Right ascension	08h 56m 19.2615s
Declination	−52° 43′ 24.506″
Apparent magnitude (V)	4.70[citation needed]
Characteristics
Spectral type	B5V + B9.5V
Astrometry
A
Proper motion (μ)	RA: −15.386±0.588 mas/yr ; Dec.: 14.468±0.524 mas/yr
Parallax (π)	8.5823±0.3177 mas
Distance	380 ± 10 ly ; (117 ± 4 pc)
B
Proper motion (μ)	RA: −17.787±0.271 mas/yr ; Dec.: 12.031±0.250 mas/yr
Parallax (π)	8.1722±0.1358 mas
Distance	399 ± 7 ly ; (122 ± 2 pc)
Orbit
Primary	Aa
Name	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 M☉
Temperature	16,000 K
Rotational velocity (v sin i)	50 km/s
Ab
Mass	0.59 M☉
Temperature	9,500 K
B
Mass	1.55 M☉
Temperature	8,871 K
Other designations
	H Vel, CPD−52 1788, HD 76805, HIP 43878, HR 3574, SAO 236417
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. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
1 2 3 4 5 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.
1 2 3 4 5 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.
1 2 3 4 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.
1 2 3 "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.

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[Roman1987-1] Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.

[Gaia_DR2-2] 1 2 3 4 5 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.

[Veramendi2014-3] 1 2 3 4 5 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.

[Gaia_DR2b-4] 1 2 3 4 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.

[msc-5] 1 2 3 "Multiple Star Catalog". Multiple Star Catalog. Retrieved 2019-10-06.^{[permanent dead link]}

[Simbad-6] "HD 76805". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-10-06.

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Observation data Epoch J2000.0 Equinox ICRS
Location of HD 76805 (circled in red)
Constellation	Vela^[1]
Right ascension	08^h 56^m 19.2615^s^[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 mas^[2]
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 mas^[4]
Distance	399 ± 7 ly (122 ± 2 pc)
Orbit
Primary	Aa
Name	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
H Vel, CPD−52 1788, HD 76805, HIP 43878, HR 3574, SAO 236417^[6]
Database references
SIMBAD	data