65 Arietis

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65 Arietis
Observation data
Epoch J2000      Equinox J2000
Constellation Aries
Right ascension  03h 24m 26.11530s[1]
Declination +20° 48′ 12.5626″[1]
Apparent magnitude (V) 6.07[2]
Evolutionary stage main sequence[3]
Spectral type A1 V[4]
B−V color index −0.028±0.006[2]
Radial velocity (Rv)−6.2±2.3[2] km/s
Proper motion (μ) RA: +0.28[5] mas/yr
Dec.: −10.35[5] mas/yr
Parallax (π)9.4511 ± 0.0940[1] mas
Distance345 ± 3 ly
(106 ± 1 pc)
Absolute magnitude (MV)1.17[2]
Mass2.45±0.03[3] M
Radius2.7[6] R
Luminosity36.75[2] L
[3] K
Rotational velocity (v sin i)27[3] km/s
Other designations
65 Ari, BD+20°556, HD 21050, HIP 15870, HR 1027, SAO 75915[7]
Database references

65 Arietis is a star in the northern constellation of Aries, located near Tau Arietis. 65 Arietis, abbreviated '65 Ari', is the Flamsteed designation. It has an apparent visual magnitude of 6.07,[7] which, according to the Bortle Dark-Sky Scale, means it is faintly visible to the naked eye when viewed from dark suburban skies. Based upon an annual parallax shift of 9.45±0.09 mas,[5] it is approximately 345 light-years (106 parsecs) distant from the Sun. The star is moving closer to the Earth with a heliocentric radial velocity of around −6 km/s.[2]

This is an ordinary A-type main sequence star with a stellar classification of A1 V,[4] it has about 2.45 times the mass of the Sun and shines with 40 times the Sun's luminosity. This energy is being radiated into outer space at an effective temperature of 10.300 K,[3] giving it the white-hued glow of an A-type star. It is roughly 23% of the way through its lifetime on the main sequence of core hydrogen burning stars.[3]


  1. ^ a b c 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. ^ a b c d e f 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. ^ a b c d e f Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, A120.
  4. ^ a b Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
  5. ^ a b c van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  6. ^ Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (Third ed.), 367 (2): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
  7. ^ a b "65 Ari". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-07-18.

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