64 Arietis

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64 Arietis
Observation data
Epoch J2000      Equinox J2000
Constellation Aries
Right ascension 03h 24m 18.4749s[1]
Declination +24° 43′ 26.626″[1]
Apparent magnitude (V) +5.67[2]
Spectral type K4 III[2]
B−V color index 1.19
Radial velocity (Rv)+8.49 ± 0.09[3] km/s
Proper motion (μ) RA: +15.22[1] mas/yr
Dec.: –52.36[1] mas/yr
Parallax (π)15.68 ± 0.32[1] mas
Distance208 ± 4 ly
(64 ± 1 pc)
Radius11[3] R
Luminosity42[3] L
Surface gravity (log g)2.5[3] cgs
Temperature4,426[3] K
Rotational velocity (v sin i)1.4[3] km/s
Other designations
BD+24° 481, HD 21017, HIP 15861, HR 1022, SAO 75912.[4]
Database references

64 Arietis (abbreviated 64 Ari) is a star in the northern constellation of Aries. 64 Arietis is the Flamsteed designation. It is faintly visible to the naked eye with an apparent visual magnitude of +5.67.[2] This is a giant star with a stellar classification of K4 III.[2] It has 11 times the radius of the Sun and shines with 42 times the Sun's luminosity.[3] This energy is being radiated from the outer envelope at an effective temperature of 4,426 K,[3] giving it the orange-hued glow of a K-type star. Based upon an annual parallax shift of 15.68 mas,[1] this star is approximately 208 light-years (64 parsecs) distant from Earth.


  1. ^ a b c d e f 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.
  2. ^ a b c d 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.
  3. ^ a b c d e f g h 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.
  4. ^ "* 64 Ari". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-07-18.

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