66 Arietis

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66 Arietis
Observation data
Epoch J2000      Equinox J2000
Constellation Aries
Right ascension 03h 28m 26.56850s[1]
Declination +22° 48′ 14.4271″[1]
Apparent magnitude (V) 6.03[2] (6.2/10.4)[3]
Spectral type K0 IV[4]
B−V color index 0.964[5]
Radial velocity (Rv) +48.99 ± 0.16[5] km/s
Proper motion (μ) RA: +2.12[1] mas/yr
Dec.: –110.85[1] mas/yr
Parallax (π) 15.52 ± 0.81[1] mas
Distance 210 ± 10 ly
(64 ± 3 pc)
66 Ari A
Radius 6[5] R
Luminosity 18[5] L
Surface gravity (log g) 3.0[5] cgs
Temperature 4,864[5] K
Rotational velocity (v sin i) 1.6[5] km/s
Other designations
BD+22° 495, HD 21467, HIP 16181, HR 1048, SAO 75945, WDS J03284+2248.[6]
Database references

66 Arietis (abbreviated 66 Ari) is a double star[3] in the northern constellation of Aries. 66 Arietis is the Flamsteed designation. It has an apparent visual magnitude of 6.03,[2] putting it near the limit for naked eye visibility. The magnitude 10.4 companion is located at an angular separation of 0.810 arcseconds from the primary along a position angle of 65°.[3] The distance to this pair, as determined from parallax measurements made during the Hipparcos mission, is approximately 210 light-years (64 parsecs).[1]

The spectrum of the primary component matches a stellar classification of K0 IV,[4] with the luminosity class of IV indicating this is a subgiant star. It has 6 times the radius of the Sun and shines with 18 times the Sun's energy.[5] This energy is radiated from the outer atmosphere at an effective temperature of 4,864 K,[5] giving it the cool orange-hued glow of a K-type star.


  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:0708.1752Freely accessible, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357. 
  2. ^ a b Oja, T. (September 1993), "UBV photometry of stars whose positions are accurately known. VII", Astronomy and Astrophysics Supplement Series, 100 (3): 591–592, Bibcode:1993A&AS..100..591O. 
  3. ^ a b c Fabricius, C.; Makarov, V. V. (April 2000), "Two-colour photometry for 9473 components of close Hipparcos double and multiple stars", Astronomy and Astrophysics, 356: 141–145, Bibcode:2000A&A...356..141F. 
  4. ^ a b Harlan, E. A. (September 1969), "MK classifications for F- and G-type stars. I", Astronomical Journal, 74: 916–919, Bibcode:1969AJ.....74..916H, doi:10.1086/110881. 
  5. ^ a b c d e f g h i 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. 
  6. ^ "66 Ari -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2012-08-18. 

External links[edit]