1 Arietis

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). As of 2016, the secondary had an angular separation of 2.90″ along a position angle of 165° from the primary.[6] They are moving further from the Earth with a heliocentric radial velocity of +7 km/s.[4]

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] (6.4/7.2)[3]
Characteristics
Spectral type K1 III + A6 V[3]
U−B color index +0.5[2]
B−V color index +0.74[2]
Astrometry
Radial velocity (Rv)6.95±0.13[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)
Absolute magnitude (MV)−0.39[4]
Details
Luminosity141.51[4] L☉
Other designations
1 Ari, BD+21°243, HIP 8544, HR 530, SAO 74966, ADS 1457, WDS J01501+2217[5]
1 Ari A: HD 11154.
1 Ari B: HD 11155.
Database references
SIMBADdata

The brighter star, designated component A, is a magnitude 6.40 giant star with a stellar classification of K1 III. The companion star, component B, is a magnitude 7.20 A-type main sequence star with a classification of A6 V.[3] Helmut Abt (1985) had this star classified as A3 IV,[7] matching a more evolved subgiant.

References
  1. 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. 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. 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. 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.
  5. "* 1 Ari". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-07-18.
  6. Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122: 3466–3471, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.
  7. Abt, H. A. (September 1985), "Visual multiples. VIII - 1000 MK types", Astrophysical Journal Supplement Series, 59: 95–112, Bibcode:1985ApJS...59...95A, doi:10.1086/191064
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