| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Vela |
| Right ascension | 09 51 40.66782 |
| Declination | −46° 32′ 51.4329″ |
| Apparent magnitude (V) | 4.58 |
| Characteristics | |
| Evolutionary stage | supergiant |
| Spectral type | G5 Ib or G6 IIa |
| B−V color index | 1.20 |
| Astrometry | |
| Radial velocity (Rv) | +7.8±3.2 km/s |
| Proper motion (μ) | RA: −24.784 mas/yr Dec.: +9.843 mas/yr |
| Parallax (π) | 4.3323 ± 0.1445 mas |
| Distance | 750 ± 30 ly (231 ± 8 pc) |
| Absolute magnitude (MV) | −2.96 |
| Orbit | |
| Period (P) | 329.266±0.085 d |
| Eccentricity (e) | 0 (adopted) |
| Periastron epoch (T) | 2453860.281±0.074 HJD |
| Semi-amplitude (K1) (primary) | 13.021±0.012 km/s |
| Details | |
| Mass | 6.2±0.5 M☉ |
| Luminosity | 1908.45 L☉ |
| Temperature | 4,796 K |
| Rotational velocity (v sin i) | 19.3±1.0 km/s |
| Age | 63.7±15.8 Myr |
| Other designations | |
| m Vel, CD−45° 5508, HD 85622, HIP 48374, HR 3912, SAO 221553 | |
| Database references | |
| SIMBAD | data |
HD 85622 is a binary star system in the southern constellation of Vela. It is visible to the naked eye with an apparent visual magnitude of 4.58. The distance to HD 85622 can be estimated from its annual parallax shift of 4.3 mas, yielding a value of 750 light years. It is moving further from the Earth with a heliocentric radial velocity of +8 km/s.
This is a single-lined spectroscopic binary with a circular orbit and a period of 329.3 days. The a sin i value is 0.39 AU, where a is the semimajor axis and i is the orbital inclination to the line of sight. This value provides a lower bound on the actual semimajor axis. The system shows a micro-variability in its brightness, and is a source of X-ray emission with an apparent flux of 42.6×10 W/m.
The visible component is a supergiant star with a stellar classification of G5 Ib or G6 IIa. It is about 64 million years old with a projected rotational velocity of 19 km/s. The star has 6.2 times the mass of the Sun and is radiating 1,908 times the Sun's luminosity from its photosphere at an effective temperature of 4,796 K.
References
- ^ 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.
- ^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
- ^ Hearnshaw, J. B.; Komonjinda, Siramas; Skuljan, J.; Kilmartin, P. M. (November 2012), "A study of non-Keplerian velocities in observations of spectroscopic binary stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 298–310, arXiv:1211.5527, Bibcode:2012MNRAS.427..298H, doi:10.1111/j.1365-2966.2012.21802.x, S2CID 118368473
- ^ Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373
- ^ De Medeiros, J. R.; Udry, S.; Burki, G.; Mayor, M. (2002), "A catalog of rotational and radial velocities for evolved stars. II. Ib supergiant stars", Astronomy and Astrophysics, 395: 97–98, Bibcode:2002A&A...395...97D, doi:10.1051/0004-6361:20021214.
- ^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
- ^ Tetzlaff, N.; et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x, S2CID 118629873.
- ^ McDonald, I.; et al. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–357, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
- "HD 85622". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-08-08.
- Hunsch, M.; et al. (January 1998), "The ROSAT all-sky survey catalogue of optically bright late-type giants and supergiants", Astronomy and Astrophysics Supplement, 127 (2): 251–255, Bibcode:1998A&AS..127..251H, doi:10.1051/aas:1998347.
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