Probable binary star in the constellation Camelopardalis
HD 21447 is a probablebinary star [ 9] Camelopardalis . The star is also known asHR 1046 . It can be viewed with the naked eye, having anapparent visual magnitude of 5.09.[ 1] parallax shift of± 0.29 mas [ 2] light years from the Sun. It is a candidate for membership in theUrsa Major Moving Group .[ 10]
The primary component isA-type main-sequence star with astellar classification of A1 Va.[ 3] [ 7] projected rotational velocity of 182 km/s.[ 7] [ 5] mass of the Sun and about 1.9[ 6] Sun's radius . It is radiating around 32[ 1] Sun's luminosity from itsphotosphere at aneffective temperature of 10,049 K.[ 7] angular separation of″ [ 9]
^a b c d e f g 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 . XHIP record for this object atVizieR .^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 ,S2CID 18759600 . ^a b Gray, R. O.; Garrison, R. F. (December 1987), "The Early A-Type Stars: Refined MK Classification, Confrontation with Stroemgren Photometry, and the Effects of Rotation",Astrophysical Journal Supplement ,65 : 581,Bibcode :1987ApJS...65..581G ,doi :10.1086/191237 ^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project",Astronomy & Astrophysics ,546 : 14,arXiv :1208.3048 Bibcode :2012A&A...546A..61D ,doi :10.1051/0004-6361/201219219 ,S2CID 59451347 , A61. ^a b De Rosa, R. J.; et al. (January 2014), "The VAST Survey - III. The multiplicity of A-type stars within 75 pc",Monthly Notices of the Royal Astronomical Society ,437 (2):1216– 1240,arXiv :1311.7141 Bibcode :2014MNRAS.437.1216D ,doi :10.1093/mnras/stt1932 S2CID 88503488 . ^a b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)",Astronomy and Astrophysics ,367 (Third ed.):521– 524,arXiv :astro-ph/0012289 Bibcode :2001A&A...367..521P ,doi :10.1051/0004-6361:20000451 ,S2CID 425754 . ^a b c d e f g David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets",The Astrophysical Journal ,804 (2): 146,arXiv :1501.03154 Bibcode :2015ApJ...804..146D ,doi :10.1088/0004-637X/804/2/146 ,S2CID 33401607 . ^ "HD 21447" .SIMBAD Centre de données astronomiques de Strasbourg . Retrieved2018-05-16 .^a b 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 S2CID 14878976 . ^ King, Jeremy R.; et al. (2003),"Stellar Kinematic Groups. II. A Reexamination of the Membership, Activity, and Age of the Ursa Major Group" The Astronomical Journal ,125 (4): 1980,Bibcode :2003AJ....125.1980K ,doi :10.1086/368241
