CK Carinae(CK Car/HD 90382/SAO 238038) is a variable star in the constellationCarina,the keel ofArgo Navis.It is a member of the star associationCarina OB1-D,at a distance of around2,300parsecsor7,500light years.
Classified as asemiregular variable star,CK Carinae's brightness varies betweenapparent magnitudes+7.2 and +8.5 with a period of approximately 525 days.[3]It has aGaia Data Release 2parallaxof0.4286±0.0806mas,[5]which implies a distance of around2,300 pc,and is thought to be a member of the Carina OB1-D stellar association which is at a distance of about2,200 pc.[2][9]An analysis of the distances of apparently-nearby OB stars implies a distance of2,920 pcfor CK Carinae.[6]It has anMK spectral classificationof M3.5 Iab, with theluminosity classindicating an intermediate luminositysupergiant.[4]
CK Carinae is ared supergiantwith aneffective temperatureof 3,500K.[7]It is 690 times larger than the Sun,[7]which means that if it were in the place of the Sun, its surface would reach beyond the orbit of Mars, with Earth being encompassed within the star. Consequently, CK Carinae is also a luminous star, radiating 72,000 times as much energy as the sun.[7]
^abcSamus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)".VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S.1.Bibcode:2009yCat....102025S.
^abcdefghGonzález-Torà, G.; Wittkowski, M.; Davies, B.; Plez, B. (2024). "The effect of winds on atmospheric layers of red supergiants II. Modelling VLTI/GRAVITY and MATISSE observations of AH Sco, KW SGR, V602 Car, CK Car, and V460 Car".Astronomy & Astrophysics.683:A19.arXiv:2312.12521.Bibcode:2024A&A...683A..19G.doi:10.1051/0004-6361/202348047.
^Anders, F.; Khalatyan, A.; Chiappini, C.; Queiroz, A. B.; Santiago, B. X.; Jordi, C.; Girardi, L.; Brown, A. G. A.; Matijevič, G.; Monari, G.; Cantat-Gaudin, T.; Weiler, M.; Khan, S.; Miglio, A.; Carrillo, I.; Romero-Gómez, M.; Minchev, I.; De Jong, R. S.; Antoja, T.; Ramos, P.; Steinmetz, M.; Enke, H. (2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18".Astronomy & Astrophysics.628:A94.arXiv:1904.11302.Bibcode:2019A&A...628A..94A.doi:10.1051/0004-6361/201935765.S2CID131780028.
