HD 72108

HD 72108
Observation data; Epoch J2000.0 Equinox J2000.0
Constellation	Vela
Right ascension	08h 29m 04.752s
Declination	−47° 55′ 44.12″
Apparent magnitude (V)	+5.33[citation needed]
Characteristics
Spectral type	B2IV + B2IV
Astrometry
Radial velocity (Rv)	29.00±3.7 km/s
Proper motion (μ)	RA: −6.90±0.43 mas/yr ; Dec.: +7.12±0.34 mas/yr
Parallax (π)	1.53±0.34 mas
Distance	approx. 2,100 ly ; (approx. 700 pc)
Absolute magnitude (MV)	−1.06[citation needed]
Orbit
Primary	HD 72018 Aa
Companion	HD 72018 Ab
Period (P)	340±50 yr
Semi-major axis (a)	0.427±0.030″
Eccentricity (e)	0.748±0.030
Inclination (i)	78.9±2.0°
Longitude of the node (Ω)	114.7±2.0°
Periastron epoch (T)	1947.7±2.0
Argument of periastron (ω); (secondary)	300.0±5.0°
Details
HD 72018 Aa
Mass	6.08±3.43 M☉
HD 72018 Ab
Mass	5.45±3.08 M☉
Other designations
	HR 3358, CD−47°4004, HIP 41616, SAO 219985, WDS J08291-4756AB
Database references
SIMBAD	data

HD 72108 (A Vel, A Velorum) is a star system in the constellation Vela. It is approximately 1640 light years from Earth.

The primary component, HD 72108 A, is a blue-white B-type subgiant with an apparent magnitude of +5.33. It is a spectroscopic binary, whose components are separated by 0.176 arcseconds. At a distance of 4 arcseconds away is the third component, the magnitude +7.7 HD 72108 B. The fourth component, HD 72108 C has an apparent magnitude of +9.3, and is 19 arcseconds from the primary.

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.
^ ^a ^b ^c ^d ^e van Leeuwen, F. (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. Vizier catalog entry
^ Docobo, J. A.; Andrade, M. (2013). "Dynamical and physical properties of 22 binaries discovered by W. S. Finsen". Monthly Notices of the Royal Astronomical Society. 428 (1): 321–339. Bibcode:2013MNRAS.428..321D. doi:10.1093/mnras/sts045.
^ Kharchenko, N. V.; et al. (2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ˜55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten. 328 (9): 889. arXiv:0705.0878. Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776. S2CID 119323941.
^ ^a ^b ^c Docobo, J. A.; Andrade, M. (2013). "Dynamical and physical properties of 22 binaries discovered by W. S. Finsen". Monthly Notices of the Royal Astronomical Society. 428 (1): 321–339. Bibcode:2013MNRAS.428..321D. doi:10.1093/mnras/sts045.
^ "HR 3358 -- Double or multiple star". SIMBAD Astronomical Database. Centre de données astronomiques de Strasbourg. Retrieved 2014-12-02.

This binary or multiple star system-related article is a stub. You can help Wikipedia by expanding it.

[constellation-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.

[van_Leeuwen2007-2] van Leeuwen, F. (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. Vizier catalog entry

[Docobo2013-3] Docobo, J. A.; Andrade, M. (2013). "Dynamical and physical properties of 22 binaries discovered by W. S. Finsen". Monthly Notices of the Royal Astronomical Society. 428 (1): 321–339. Bibcode:2013MNRAS.428..321D. doi:10.1093/mnras/sts045.

[4] Kharchenko, N. V.; et al. (2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ˜55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten. 328 (9): 889. arXiv:0705.0878. Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776. S2CID 119323941.

[orbit-5] Docobo, J. A.; Andrade, M. (2013). "Dynamical and physical properties of 22 binaries discovered by W. S. Finsen". Monthly Notices of the Royal Astronomical Society. 428 (1): 321–339. Bibcode:2013MNRAS.428..321D. doi:10.1093/mnras/sts045.

[SIMBAD-6] "HR 3358 -- Double or multiple star". SIMBAD Astronomical Database. Centre de données astronomiques de Strasbourg. Retrieved 2014-12-02.

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Observation data Epoch J2000.0 Equinox J2000.0
Constellation	Vela^[1]
Right ascension	08^h 29^m 04.752^s^[2]
Declination	−47° 55′ 44.12″^[2]
Apparent magnitude (V)	+5.33^{[citation needed]}
Characteristics
Spectral type	B2IV + B2IV^[3]
Astrometry

Radial velocity (R_v)	29.00±3.7^[4] km/s
Proper motion (μ)	RA: −6.90±0.43^[2] mas/yr Dec.: +7.12±0.34^[2] mas/yr
Parallax (π)	1.53±0.34 mas^[2]
Distance	approx. 2,100 ly (approx. 700 pc)
Absolute magnitude (M_V)	−1.06^{[citation needed]}

Orbit^[5]
Primary	HD 72018 Aa
Companion	HD 72018 Ab
Period (P)	340±50 yr
Semi-major axis (a)	0.427±0.030″
Eccentricity (e)	0.748±0.030
Inclination (i)	78.9±2.0°
Longitude of the node (Ω)	114.7±2.0°
Periastron epoch (T)	1947.7±2.0
Argument of periastron (ω) (secondary)	300.0±5.0°
Details
HD 72018 Aa
Mass	6.08±3.43^[5] `M`_☉
HD 72018 Ab
Mass	5.45±3.08^[5] `M`_☉
Other designations
HR 3358, CD−47°4004, HIP 41616, SAO 219985, WDS J08291-4756AB^[6]
Database references
SIMBAD	data