1 Arietis

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1 Arietis
Observation data
Epoch J2000      Equinox J2000
Constellation Aries
Right ascension 01h 50m 08.56984s[1]
Declination +22° 16′ 31.2100″[1]
Apparent magnitude (V) 5.86[2] (6.40/7.20)[3]
Spectral type K1 III + A6 V[3]
U−B color index +0.50[2]
B−V color index +0.74[2]
Radial velocity (Rv)+1[4] km/s
Proper motion (μ) RA: –16.52[1] mas/yr
Dec.: –8.25[1] mas/yr
Parallax (π)5.57 ± 0.75[1] mas
Distanceapprox. 590 ly
(approx. 180 pc)
Other designations
ADS 1457, BD+21 243, HIP 8544, HR 530, SAO 74966.[5]
1 Ari A: HD 11154.
1 Ari B: HD 11155.
Database references

1 Arietis is a double star[3] in the northern constellation of Aries. 1 Arietis is the Flamsteed designation. The pair have a combined visual magnitude of 5.86,[2] making it faintly visible to the naked eye. Based upon an annual parallax shift of 5.57 mas,[1] the distance to the two stars is approximately 590 light-years (180 parsecs). The brighter component is a magnitude 6.40 giant star with a stellar classification of K1 III. The companion star, at an angular separation of 2.873 arcseconds from the primary, is a magnitude 7.20 A-type main sequence star with a classification of A6 V.[3]


  1. ^ a b c d e f van Leeuwen, F. (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 Nicolet, B. (1978). "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System". Astronomy and Astrophysics Supplement Series. 34: 1–49. Bibcode:1978A&AS...34....1N.
  3. ^ a b c d Eggleton, P. P.; Tokovinin, A. A. (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.
  4. ^ Wilson, R. E. (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institution of Washington. Bibcode:1953GCRV..C......0W. LCCN 54001336.
  5. ^ "* 1 Ari". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-07-18.

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