HR 4339

HR 4339

Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Hydra
Right ascension	11^h 09^m 53.39376^s[1]
Declination	–32° 22′ 03.0986″[1]
Apparent magnitude (V)	5.79[2]
Characteristics
Evolutionary stage	main sequence[3]
Spectral type	A1V[4]
B−V color index	0.027±0.005[2]
Astrometry
Radial velocity (Rv)	+1.3±0.5[2] km/s
Proper motion (μ)	RA: +18.454[1] mas/yr Dec.: -29.966[1] mas/yr
Parallax (π)	8.9232 ± 0.0816 mas[1]
Distance	366 ± 3 ly (112 ± 1 pc)
Absolute magnitude (MV)	0.38[2]
Details
Mass	2.61±0.06[3] M☉
Luminosity	72.1+7.8 −7.0[3] L☉
Temperature	9,120+127 −215[3] K
Rotational velocity (v sin i)	73[3] km/s
Other designations
Beta Antliae[5], NSV 5111, BD−31°8816, HD 97023, HIP 54561, HR 4339, SAO 202149[6]
Database references
SIMBAD	data

HR 4339 is a single^[7] star in the equatorial constellation of Hydra. It was designated as Beta Antliae by Lacaille, and Gould intended to keep it in that constellation. However, the delineating of constellation boundaries by the IAU in 1930 saw it transferred to Hydra.^[5] It has a white hue and is just visible to the naked eye with an apparent visual magnitude of 5.79.^[2] The distance to this star, as determined from parallax measurements, is approximately 366 light years.^[1] It is drifting further away with a radial velocity of +1.3 km/s.^[2]

This object is an A-type main-sequence star with a stellar classification of A1V.^[4] It is a suspected variable star of unknown type and magnitude.^[8] The star has 2.6^[3] times the mass of the Sun and it is spinning with a projected rotational velocity of 73 km/s.^[3] It is radiating around 72 times the luminosity of the Sun from its photosphere at an effective temperature of 9,120 K.^[3]

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. S2CID 119257644.
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. S2CID 55586789. A120.
4. Houk, Nancy (1979). Michigan catalogue of two-dimensional spectral types for the HD stars. Vol. 3. Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan. Bibcode:1982mcts.book.....H.
5. Wagman, Morton (2003). Lost Stars: Lost, Missing and Troublesome Stars from the Catalogues of Johannes Bayer, Nicholas Louis de Lacaille, John Flamsteed, and Sundry Others. Blacksburg, VA: The McDonald & Woodward Publishing Company. p. 29. ISBN 978-0-939923-78-6.
6. "HD 97023". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-12-06.
7. 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. S2CID 14878976.
8. Samus, N. N.; et al. (2017). "General Catalogue of Variable Stars". Astronomy Reports. 5.1. 61 (1): 80–88. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. S2CID 125853869.