45 Cancri Star in the constellation Cancer
For other stars with this Bayer designation, see
A Cancri .
45 Cancri
Observation dataEpoch J2000.0 Equinox J2000.0
Constellation Cancer
Right ascension 08h 43m 12.32940s [ 1]
Declination +12° 40′ 51.1486″ [ 1]
Apparent magnitude (V)5.62[ 2]
Characteristics
Spectral type G8 III and A3 III [ 3]
B−V color index
± 0.005[ 2]
Astrometry Radial velocity (Rv )± 2.3[ 2] km/s Proper motion (μ) RA: −9.828[ 1] mas /yr Dec.: +0.916[ 1] mas /yr Parallax (π)4.7700± 0.1025 mas [ 1] Distance 680 ± 10 ly pc ) Absolute magnitude (MV )−1.62[ 2] Orbit [ 4] Period (P)± 0.12 dEccentricity (e)± 0.002Semi-amplitude 1 )± 0.06 km/sSemi-amplitude (K2 )± 0.02 km/sDetails 45 Cnc A Mass ± 0.10[ 3] M ☉ Radius +5.03 [ 1] R ☉ Luminosity ± 5.4[ 1] L ☉ Surface gravity (log g )2.72[ 5] cgs Temperature 5,058[ 5] K Metallicity [Fe/H] ± 0.22[ 5] dex Rotational velocity (v sin i )5.3[ 6] km/s 45 Cnc B Mass ± 0.10[ 3] M ☉ Luminosity +43.9 [ 3] L ☉ Other designations A1 Cnc, [ 7] 45 Cnc , BD +13°1972FK5 2686HD 74228HIP 42795HR 3450SAO 98069[ 8] Database references SIMBAD data
45 Cancri is a binary star [ 4] zodiac constellation of Cancer , located 680 light-years away from the Sun .[ 1] Bayer designation A1 Cancri ;[ 7] 45 Cancri is the Flamsteed designation . It is visible to the naked eye as a faint, white-hued star at an apparent visual magnitude of 5.62.[ 2] spectroscopic binary with an orbital period of 2.76 years and an eccentricity of 0.46.[ 4] radial velocity of −6 km/s.[ 2]
The primary, designated component A, is an aging giant star with a stellar classification of G8 III,[ 9] red giant branch .[ 3] [ 3] mass of the Sun and has expanded to 14[ 1] Sun's radius . The star is radiating 210[ 1] luminosity of the Sun from its enlarged photosphere at an effective temperature of K [ 5] III. It has three times the mass of the Sun and shines with 191 times the Sun's luminosity.[ 3]
References
1 2 3 4 5 6 7 8 9 10 Brown, A. G. A. ; et al. (Gaia collaboration ) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties" . Astronomy & Astrophysics 616 . A1. arXiv :1804.09365 Bibcode :2018A& A...616A...1G doi :10.1051/0004-6361/201833051 Gaia DR2 record for this source at VizieR .1 2 3 4 5 6 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 , S2CID 119257644 . 1 2 3 4 5 6 7 Griffin, R. E. M.; Griffin, R. F. (February 2015), "Composite spectra: XX. 45 Cancri. Two stars with very similar masses but quite different evolutionary states", Astronomische Nachrichten , 336 (2): 178– 188, Bibcode :2015AN....336..178G , doi :10.1002/asna.201412148 1 2 3 Eggleton, Peter P.; Yakut, Kadri (July 2017), "Models for 60 double-lined binaries containing giants", Monthly Notices of the Royal Astronomical Society , 468 (3): 3533– 3556, arXiv :1611.05041 Bibcode :2017MNRAS.468.3533E , doi :10.1093/mnras/stx598 1 2 3 4 Soubiran, Caroline; et al. (2016), "The PASTEL catalogue: 2016 version", Astronomy & Astrophysics , 591 : A118, arXiv :1605.07384 Bibcode :2016A& A...591A.118S , doi :10.1051/0004-6361/201628497 , S2CID 119258214 . ↑ [ permanent dead link ] 1 2 HD 74228 , HD-DM-GC-HR-HIP-Bayer-Flamsteed Cross Index, N. D. Kostjuk, Institute of Astronomy of Russian Academy of Sciences, 2002; CDS ID IV/27A .↑ "45 Cnc" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 2019-03-04 .↑ Ginestet, N.; Carquillat, J. M. (2002), "Spectral Classification of the Hot Components of a Large Sample of Stars with Composite Spectra, and Implication for the Absolute Magnitudes of the Cool Supergiant Components", The Astrophysical Journal Supplement Series , 143 (2): 513, Bibcode :2002ApJS..143..513G , doi :10.1086/342942 , S2CID 120976247
