39 Cancri
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cancer
Right ascension 08h 40m 06.41823s[1]
Declination +20° 00′ 28.0339″[1]
Apparent magnitude (V) 6.39[2]
Characteristics
Spectral type G8+ III-IIIb[3]
B−V color index 0.98[2]
Astrometry
Radial velocity (Rv)33.88[2] km/s
Proper motion (μ) RA: −35.610[1] mas/yr
Dec.: −11.964[1] mas/yr
Parallax (π)5.3162 ± 0.0589 mas[1]
Distance614 ± 7 ly
(188 ± 2 pc)
Details
Mass2.88[2] M☉
Radius12[4] R☉
Luminosity105[2] L☉
Surface gravity (log g)2.70±0.11[5] cgs
Temperature4,954±25[2] K
Metallicity [Fe/H]+0.21±0.05[5] dex
Age460[2] Myr
Other designations
39 Cnc, BD+20°2158, HD 73665, HIP 42516, HR 3427, SAO 80333[6]
Database references
SIMBADdata

39 Cancri is a star in the constellation Cancer, located about 614 light years from the Sun in the Beehive Cluster (NGC 2632). It is a challenge to see with the naked eye, having an apparent visual magnitude of 6.39.[2] This object is moving further from the Earth with a heliocentric radial velocity of 34 km/s.[2]

This is an evolved giant star with a stellar classification of G8+ III-IIIb,[3] indicating it has consumed the hydrogen at its core. It is 460[2] million years old with 2.88[2] times the mass of the Sun and about 12[4] times the Sun's radius. The star is radiating 105[2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,954 K.[2]

References

  1. ^ a b c d e 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.
  2. ^ a b c d e f g h i j k l m Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal, 150 (3), 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID 118505114.
  3. ^ a b Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", The Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
  4. ^ a b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (Third ed.), 367: 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
  5. ^ a b Prugniel, Ph.; et al. (July 2011), "The atmospheric parameters and spectral interpolator for the MILES stars", Astronomy & Astrophysics, 531: A165, arXiv:1104.4952, Bibcode:2011A&A...531A.165P, doi:10.1051/0004-6361/201116769, S2CID 54940439.
  6. ^ "39 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-03-03.
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