HD 85622

HD 85622
Observation data; Epoch J2000 Equinox J2000
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.^[1] The distance to HD 85622, as measured from its annual parallax shift of 3.6857 mas,^[2] is 880 light years. It is moving further from the Earth with a heliocentric radial velocity of +8 km/s.^[8]

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.^[3] This value provides a lower bound on the actual semimajor axis. The system shows a micro-variability in its brightness,^[3] and is a source of X-ray emission with an apparent flux of 42.6×10⁻¹⁷ W/m².^[9]

The visible component is a supergiant star with a stellar classification of G5 Ib^[3] or G6 IIa.^[4] It is about 64 million years old^[6] with a projected rotational velocity of 19 km/s.^[5] The star has 6.2 times the mass of the Sun^[6] and is radiating 1,600 times the Sun's luminosity from its photosphere at an effective temperature of 4,761 K.^[6]

References

^ ^a ^b ^c ^d 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.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j 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.
^ ^a ^b ^c ^d ^e ^f 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
^ ^a ^b 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
^ ^a ^b ^c 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.
^ ^a ^b ^c ^d ^e 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] 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] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j 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] ^ ^a ^b ^c ^d ^e ^f 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] 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] 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] 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.

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Observation data Epoch J2000 Equinox J2000
Constellation	Vela^[1]
Right ascension	09^h 51^m 40.66831^s^[2]
Declination	−46° 32′ 51.4401″^[2]
Apparent magnitude (V)	4.58^[1]
Characteristics
Evolutionary stage	Supergiant^[3]
Spectral type	G5 Ib^[3] or G6 IIa^[4]
B−V color index	1.20^[5]
Astrometry

Radial velocity (R_v)	15.94±2.50^[2] km/s
Proper motion (μ)	RA: −25.119 mas/yr^[2] Dec.: +10.305 mas/yr^[2]
Parallax (π)	3.6857±0.1289 mas^[2]
Distance	880 ± 30 ly (271 ± 9 pc)
Absolute magnitude (M_V)	−2.96^[1]

Orbit^[3]
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^[6] `M`_☉
Radius	62.6+2.5 −2.2^[2] `R`_☉
Luminosity	1,602+109 −93^[2] `L`_☉
Surface gravity (log g)	1.65^[2] cgs
Temperature	4,761^[2] K
Rotational velocity (v sin i)	19.3±1.0^[5] km/s
Age	63.7±15.8^[6] Myr

Other designations
m Vel, CD−45°5508, HD 85622, HIP 48374, HR 3912, SAO 221553^[7]
Database references
SIMBAD	data

HD 85622

HD 85622

HD 85622

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HD 85622

References