HD 72108

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

This article is about A Velorum. For a Velorum, see HD 75063.
HD 72108
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Vela
Right ascension  08h 29m 04.752s[1]
Declination –47° 55′ 44.12″[1]
Apparent magnitude (V) +5.33
Characteristics
Spectral type B2IV + B2IV[2]
Astrometry
Radial velocity (Rv)29.00 ± 3.7[3] km/s
Proper motion (μ) RA: –6.90 ± 0.43[1] mas/yr
Dec.: 7.12 ± 0.34[1] mas/yr
Parallax (π)1.53 ± 0.34[1] mas
Distanceapprox. 2,100 ly
(approx. 700 pc)
Absolute magnitude (MV)–1.06
Orbit[4]
PrimaryHD 72018 Aa
CompanionHD 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
Mass6.08 ± 3.43[4] M☉
HD 72018 Ab
Mass5.45 ± 3.08[4] M☉
Other designations
HR 3358, CD–47°4004, HIP 41616, SAO 219985, WDS J08291-4756AB[5]
Database references
SIMBADdata

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
  1. 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. Vizier catalog entry
  2. 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.
  3. Kharchenko, N. V.; et al. "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.
  4. 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.
  5. "HR 3358 -- Double or multiple star". SIMBAD Astronomical Database. Centre de données astronomiques de Strasbourg. Retrieved 2014-12-02.


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