HD 34968

HD 34968
Observation data; Epoch J2000 Equinox J2000
Constellation	Lepus
Right ascension	05h 20m 26.91498s
Declination	−21° 14′ 23.1367″
Apparent magnitude (V)	4.69 (4.73 + 8.45)
Characteristics
Spectral type	A0 V
B−V color index	−0.048±0.003
Astrometry
Radial velocity (Rv)	30.9±0.5 km/s
Proper motion (μ)	RA: +17.149 mas/yr ; Dec.: −9.382 mas/yr
Parallax (π)	8.7188 ± 0.1661 mas
Distance	374 ± 7 ly ; (115 ± 2 pc)
Absolute magnitude (MV)	−0.82
Details
HD 34968 A
Mass	3.34±0.06 M☉
Radius	2.0 R☉
Luminosity	245+38; −33 L☉
Temperature	10,046+70; −69 K
Rotational velocity (v sin i)	84 km/s
Other designations
	BD−21° 1135, HD 34968, HIP 24927, HR 1762, SAO 170327, WDS J05204-2114A
Database references
SIMBAD	data

HD 34968 is a binary star^[2] system in the southern constellation Lepus. The combined apparent visual magnitude of 4.69^[2] is bright enough to be visible to the naked eye. The distance to HD 34968 can be estimated from its annual parallax shift of 8.7 mas, yielding a range of 374 light years. It is moving further away from the Earth with a heliocentric radial velocity of 31 km/s,^[5] having come within 118.6 ly some 3,686,000 years ago.^[4]

The primary member, component A, is a magnitude 4.73 star. Houk and Smith-Moore (1978) gave this object a stellar classification of A0 V,^[3] indicating it is an ordinary A-type main-sequence star. Gray and Garrison (1987) classified it as B9.5 III and noted that the spectrum is slightly variable.^[9] It is 99.2%±2.6% of the way through its main sequence lifetime,^[6] with 3.34^[6] times the mass of the Sun and 2.0^[7] times the Sun's radius. The star is spinning with a projected rotational velocity of 84 km/s.^[6] It is radiating 245^[6] times the Sun's luminosity from its photosphere at an effective temperature of 10,046 ^[6]

The fainter secondary, component B, is a magnitude 8.45^[2] star at an angular separation of 4.1″ along a position angle of 279°, as of 2008.^[10]

References

^ ^a ^b ^c ^d ^e 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.
^ ^a ^b ^c ^d Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
^ ^a ^b Houk, Nancy; Smith-Moore, M. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1988mcts.book.....H.
^ ^a ^b ^c 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.
^ ^a ^b 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.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ Zorec, J.; Royer, F. (January 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, S2CID 55586789.
^ ^a ^b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", Astronomy and Astrophysics, 367 (2): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
^ "HD 34968". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-26.
^ Gray, R. O.; Garrison, R. F. (December 1987), "The Early A-Type Stars: Refined MK Classification, Confrontation with Stroemgren Photometry, and the Effects of Rotation", Astrophysical Journal Supplement, 65: 581, Bibcode:1987ApJS...65..581G, doi:10.1086/191237.
^ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466–3471, Bibcode:2001AJ....122.3466M, doi:10.1086/323920