HD 85622

HD 85622
	Location of HD 85622 (circled in red)
Observation data; Epoch J2000 Equinox ICRS
Constellation	Vela
Right ascension	09h 51m 40.66831s
Declination	−46° 32′ 51.4401″
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)	15.94±2.50 km/s
Proper motion (μ)	RA: −25.119 mas/yr ; Dec.: +10.305 mas/yr
Parallax (π)	3.6857±0.1289 mas
Distance	880 ± 30 ly ; (271 ± 9 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☉
Radius	62.6+2.5; −2.2 R☉
Luminosity	1,602+109; −93 L☉
Surface gravity (log g)	1.65 cgs
Temperature	4,761 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, as measured from its annual parallax shift of 3.6857 mas, is 880 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 42.6×10⁻¹⁷ W/m².

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 1,600 times the Sun's luminosity from its photosphere at an effective temperature of 4,761 K.

References

1 2 3 4 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. XHIP record for this object at VizieR.
1 2 3 4 5 6 7 8 9 10 11 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
1 2 3 4 5 6 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
1 2 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
1 2 3 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.
1 2 3 4 5 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.
↑ "HD 85622". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-08-08.
↑ 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.
↑ 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.

[Anderson2012-1] 1 2 3 4 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. XHIP record for this object at VizieR.

[GaiaDR3-2] 1 2 3 4 5 6 7 8 9 10 11 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.

[Hearnshaw2012-3] 1 2 3 4 5 6 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

[perkins1989-4] 1 2 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

[DeMedeiros2002-5] 1 2 3 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.

[Tetzlaff2011-6] 1 2 3 4 5 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.

[SIMBAD-7] "HD 85622". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-08-08.

[deBruijne2012-8] 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.

[Schmitt1998-9] 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.