36 Arietis

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36 Arietis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Aries
Right ascension  02h 44m 19.11291s[1]
Declination +17° 45′ 50.1344″[1]
Apparent magnitude (V) 6.40[2]
Evolutionary stage giant
Spectral type K2 III[3]
B−V color index 1.143±0.008[2]
Radial velocity (Rv)−34.29±0.29[2] km/s
Proper motion (μ) RA: +36.786[1] mas/yr
Dec.: −36.103[1] mas/yr
Parallax (π)8.5941 ± 0.0377[1] mas
Distance380 ± 2 ly
(116.4 ± 0.5 pc)
Absolute magnitude (MV)1.45±0.11[4]
Mass1.06±0.30 M
[1] R
Luminosity44.16±0.29[1] L
Surface gravity (log g)2.59±0.11 cgs
Temperature4,749±92 K
Metallicity [Fe/H]0.24 dex
Other designations
36 Ari, BD+17°426, FK5 2190, GC 3294, HD 17017, HIP 12784, HR 808, SAO 93081[5]
Database references

36 Arietis is a star in the northern constellation of Aries. 36 Arietis is the Flamsteed designation. It is a dim, orange-hued star that is a challenge to view with the naked eye, having an apparent visual magnitude of 6.40.[2] Based upon an annual parallax shift of 8.59±0.04 mas, this star is located 380 light-years (120 parsecs) away from the Sun. It is moving closer to the Earth with a heliocentric radial velocity of −34 km/s,[2] and is a member of the Wolf 630 moving group of stars that share a common motion through space.[6]

This object is an evolved giant star with a stellar classification of K2 III,[3] it is around two million years old with a similar mass as the Sun.[4] With the hydrogen at its core exhausted, the star has expanded to ten[1] times the girth of the Sun, it has a higher than solar metallicity, showing a high abundance of iron in its spectrum. The star is radiating 44[1] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,749 K.[4]


  1. ^ a b c d e f g h i 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 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 Adams, Walter S.; et al. (1935), "The Spectroscopic Absolute Magnitudes and Parallaxes of 4179 Stars", Astrophysical Journal, 81: 187, Bibcode:1935ApJ....81..187A, doi:10.1086/143628.
  4. ^ a b c d Feuillet, Diane K.; et al. (2016), "Determining Ages of APOGEE Giants with Known Distances", The Astrophysical Journal, 817: 40, arXiv:1511.04088, Bibcode:2016ApJ...817...40F, doi:10.3847/0004-637X/817/1/40.
  5. ^ "36 Ari". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-06-03.
  6. ^ McDonald, A. R. E.; Hearnshaw, J. B. (August 1983), "The Wolf 630 moving group of stars", Monthly Notices of the Royal Astronomical Society, 204 (3): 841–852, Bibcode:1983MNRAS.204..841M, doi:10.1093/mnras/204.3.841.

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