59 Arietis

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59 Arietis
Observation data
Epoch J2000      Equinox J2000
Constellation Aries
Right ascension  03h 19m 55.79556s[1]
Declination +27° 04′ 16.0661″[1]
Apparent magnitude (V) 5.91[2]
Spectral type G7 IV[3]
B−V color index 0.860±0.015[2]
Radial velocity (Rv)−4.67±0.14[1] km/s
Proper motion (μ) RA: −25.853[1] mas/yr
Dec.: −72.813[1] mas/yr
Parallax (π)15.3970 ± 0.0621[1] mas
Distance211.8 ± 0.9 ly
(64.9 ± 0.3 pc)
Absolute magnitude (MV)1.78[2]
Mass1.96±0.30 M
Radius5.76±0.27 R
Surface gravity (log g)3.21 cgs
Temperature5,044 K
Metallicity [Fe/H]−0.06 dex
Rotational velocity (v sin i)1.8 km/s
Other designations
59 Ari, BD+26°540, HD 20618, HIP 15514, HR 995, SAO 75863[5]
Database references

59 Arietis is a star in the northern constellation of Aries. 59 Arietis is the Flamsteed designation. It is dimly visible to the naked eye with an apparent visual magnitude of 5.91.[2] Based upon an annual parallax shift of 15.40±0.06 mas,[1] it is located approximately 212 light-years (65 parsecs) distant from the Sun. The star is moving closer to the Earth with a heliocentric radial velocity of −4.7 km/s.[1]

The spectrum of this object is that of a subgiant star with a stellar classification of G7 IV,[3] which would suggest it has exhausted the supply of hydrogen at its core and has begun to evolve into a giant star. It is around 1.7 billion years old with a projected rotational velocity of 1.8 km/s. The star has nearly double the mass of the Sun and almost six times the Sun's radius. It is radiating 20 times the luminosity of the Sun from its photosphere at an effective temperature of 5,044 K.[4]


  1. ^ a b c d e f g h 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 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 Keenan, P.; McNeil, R. (October 1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245–266, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
  4. ^ a b Brewer, John M.; et al. (2016), "Spectral Properties of Cool Stars: Extended Abundance Analysis of 1,617 Planet-Search Stars", The Astrophysical Journal Supplement Series, 225 (2): 32, arXiv:1606.07929, Bibcode:2016ApJS..225...32B, doi:10.3847/0067-0049/225/2/32.
  5. ^ "59 Ari". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-06-03.

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