1 Arietis

Double star in the constellation Aries J2000 01 50 08.56984 +22 16 31.2100 5.86 (6.4/7.2) Aries K1 III + A6 V +0.74 +0.5 6.95 0.13 –16.52 –8.25 5.57 0.75 −0.39 141.51 1 Ari +21°243 8544 530 74966 1457 J01501+2217 1 Ari A HD 11154. 1 Ari B HD 11155. 1+Ari 1 Arietis is a double star in the northern constellation of Aries. 1 Arietis is the Flamsteed designation. The pair has a combined visual magnitude of 5.86, making it faintly visible to the naked eye. Based upon an annual parallax shift of 5.57 mas, the distance to the two stars is approximately 590 ly pc off on. As of 2016, the secondary had an angular separation of 2.90 arcsecond along a position angle of 165° from the primary. They are moving further from the Earth with a heliocentric radial velocity of +7 km/s. 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. Helmut Abt (1985) had this star classified as A3 IV, matching a more evolved subgiant. References XHIP: An extended hipparcos compilation Anderson E. Francis Ch. Astronomy Letters 38 5 331 2012 2012AstL...38..331A 10.1134/S1063773712050015 1108.4971 119257644 . 1 Mason B. D. Wycoff G. L. Hartkopf W. I. Douglass G. G. Worley C. E. The Washington Visual Double Star Catalog 2014 2001AJ....122.3466M . 10.1086/323920 122 The Astronomical Journal 6 3466–3471 free Abt H. A. Visual multiples. VIII - 1000 MK types Astrophysical Journal Supplement Series 59 September 1985 95–112 10.1086/191064 1985ApJS...59...95A free van Leeuwen F. 2007 Validation of the new Hipparcos reduction Astronomy and Astrophysics 474 2 653–664 0708.1752 2007A&A...474..653V 10.1051/0004-6361:20078357 free 18759600 Nicolet B. 1978 Photoelectric photometric Catalogue of homogeneous measurements in the UBV System Astronomy and Astrophysics Supplement Series 34 1–49 1978A&AS...34....1N 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 0806.2878 2008MNRAS.389..869E 10.1111/j.1365-2966.2008.13596.x free 14878976 * 1 Ari 2012-07-18 External links CCDM J01501+2217A Image 1 Arietis Category:K-type giants Category:A-type main-sequence stars Category:Binary stars Category:Aries (constellation) Category:Durchmusterung objects Arietis, 01 011154 008544 0530