HD 32309

HD 32309 is a single[8] star in the southern constellation of Lepus. It has a blue-white hue and is visible to the naked eye with an apparent visual magnitude of 4.91.[2] The distance to this object is 197 light years based on parallax.[1] It is drifting further away from the Sun with a radial velocity of +24 km/s.[2] This is a member of the Columba association of co-moving stars.[9]

HD 32309
Observation data
Epoch J2000      Equinox J2000
Constellation Lepus
Right ascension 05h 01m 25.58117s[1]
Declination −20° 03′ 06.9054″[1]
Apparent magnitude (V) 4.91[2]
Characteristics
Evolutionary stage main sequence[3]
Spectral type B9V[4]
B−V color index −0.047±0.002[2]
Astrometry
Radial velocity (Rv)+24.2±2.8[2] km/s
Proper motion (μ) RA: +36.377[1] mas/yr
Dec.: −15.600[1] mas/yr
Parallax (π)16.5337 ± 0.1691[1] mas
Distance197 ± 2 ly
(60.5 ± 0.6 pc)
Absolute magnitude (MV)1.00[2]
Details
Mass2.56±0.02[3] or 3.24[5] M☉
Radius3.1[6] R☉
Luminosity46.5[2] L☉
Surface gravity (log g)4.27±0.14[5] cgs
Temperature12,450±423[5] K
Rotational velocity (v sin i)293[5] or 302[3] km/s
Age124[5] Myr
Other designations
BD−20°990, HD 32309, HIP 23362, HR 1621, SAO 169981[7]
Database references
SIMBADdata

This is a B-type main-sequence star with a stellar classification of B9V.[4] It is around 124[5] million years old and is spinning rapidly with a projected rotational velocity of about 300 km/s.[5][3] Mass estimates range from 2.56[3] to 3.24[5] times the mass of the Sun and it has about 3.1[6] times the Sun's radius. The star is radiating 46.5[2] times the luminosity of the Sun from its photosphere at an effective temperature of 12,450 K.[5]

References
  1. 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.
  2. 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.
  3. Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691.
  4. Houk, Nancy; Smith-Moore, M. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1988mcts.book.....H.
  5. David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146.
  6. Pasinetti Fracassini, L. E.; et al. (2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy & Astrophysics (Third ed.), 367 (2): 521–24, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451
  7. "HD 32309". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-12-14.
  8. Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
  9. Elliott, P.; et al. (May 2016), "Search for associations containing young stars (SACY). VII. New stellar and substellar candidate members in the young associations", Astronomy & Astrophysics, 590: 28, arXiv:1604.03550, Bibcode:2016A&A...590A..13E, doi:10.1051/0004-6361/201628253, A13.
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