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 mas[1] |
| Distance | approx. 2,100 ly (approx. 700 pc) |
| Absolute magnitude (MV) | –1.06 |
| Orbit[4] | |
| 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[4] M☉ |
| HD 72018 Ab | |
| Mass | 5.45 ± 3.08[4] M☉ |
| Other designations | |
| 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
[edit]- ^ 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.
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