65 Aurigae

65 Aurigae

Observation data Epoch J2000      Equinox J2000
Constellation	Auriga
Right ascension	07^h 22^m 02.61744^s[1]
Declination	+36° 45′ 38.0957″[1]
Apparent magnitude (V)	5.12[2]
Characteristics
Spectral type	K0 III[3]
B−V color index	1.082±0.005[2]
Astrometry
Radial velocity (Rv)	21.81±0.16[2] km/s
Proper motion (μ)	RA: −96.915[1] mas/yr Dec.: −22.436[1] mas/yr
Parallax (π)	12.9673 ± 0.1294 mas[1]
Distance	252 ± 3 ly (77.1 ± 0.8 pc)
Absolute magnitude (MV)	0.82[2]
Details
65 Aur A
Mass	1.34[4] M☉
Radius	13.02+0.47 −2.57[1] R☉
Luminosity	69.6±0.9[1] L☉
Surface gravity (log g)	2.72[3] cgs
Temperature	4,575±17[4] K
Metallicity [Fe/H]	−0.35±0.04[2] dex
Rotational velocity (v sin i)	0.0[5] km/s
Age	3.31[4] Gyr
Other designations
65 Aur, BD+37°1707, FK5 2568, HD 57264, HIP 35710, HR 2793, SAO 60010[6]
Database references
SIMBAD	data

65 Aurigae is a binary star^[7] system located 252 light years away from the Sun in the northern constellation of Auriga. It is visible to the naked eye as a faint, orange hued star with an apparent visual magnitude of 5.12.^[2] The primary, designated component A, is an aging giant star with a stellar classification of K0 III.^[3] It is 3.31^[4] billion years old and has expanded to 13 times the Sun's radius after exhausting the hydrogen at its core.^[1] Its companion, component B, is a magnitude 11.7 star located at an angular separation of 11.4″ from the primary, as of 2008.^[7] The pair are moving further from the Earth with a heliocentric radial velocity of 22 km/s.^[2]

It was also known to be part of a much bigger constellation named Telescopium Herschelii before it was unrecognized by the International Astronomical Union (IAU).

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. Cenarro, A. J.; et al. (January 2007), "Medium-resolution Isaac Newton Telescope library of empirical spectra - II. The stellar atmospheric parameters", Monthly Notices of the Royal Astronomical Society, 374 (2): 664–690, arXiv:astro-ph/0611618, Bibcode:2007MNRAS.374..664C, doi:10.1111/j.1365-2966.2006.11196.x, S2CID 119428437.
4. Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal, 150 (3): 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID 118505114.
5. Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 Hipparcos Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209, S2CID 121883397.
6. "65 Aur". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-05-25.
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.

External links

• HR 2793
• CCDM J07220+3646
• Image 65 Aurigae