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79 Cancri

Topic: Astronomy

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Short description: G-type star in the constellation Cancer
79 Cancri
Observation data
Equinox J2000.0]] (ICRS)
Constellation Cancer
Right ascension  09h 10m 20.85841s[1]
Declination +21° 59′ 47.1000″[1]
Apparent magnitude (V) 6.04[2]
Characteristics
Evolutionary stage giant
Spectral type G5 III[3]
B−V color index 0.871[4]
Astrometry
Radial velocity (Rv)−3.24±0.13[1] km/s
Proper motion (μ) RA: +2.933[1] mas/yr
Dec.: +5.027[1] mas/yr
Parallax (π)8.1569 ± 0.0676[1] mas
Distance400 ± 3 ly
(123 ± 1 pc)
Absolute magnitude (MV)0.78[2]
Details
Mass2.30[4] M☉
Radius9.41+0.38
−0.57[1] R☉
Luminosity57.6±0.6[1] L☉
Surface gravity (log g)2.88[5] cgs
Temperature5,076±47[4] K
Metallicity [Fe/H]−0.10[5] dex
Age770[4] Myr
Other designations
79 Cnc, BD+22°2063, GC 12655, HD 78715, HIP 45033, HR 3640, SAO 80674, WDS 09103+2200[6]
Database references
SIMBADdata

79 Cancri is a star in the constellation Cancer, located 400 light years from the Sun.[1] It is just visible to the naked eye as a dim, yellow-hued star with an apparent visual magnitude of 6.04.[2] This object is gradually moving slower to the Earth with a heliocentric radial velocity of −3.2 km/s.[1]

This is an aging giant star with a stellar classification of G5 III,[3] which indicates that, at the age of 770[4] million years, it has exhausted the hydrogen at its core and evolved away from the main sequence. The star has 2.30[4] times the mass of the Sun and has expanded to 9.4[1] times the Sun's radius. It is radiating 58[1] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 5,076 K.[4]

References

  1. ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  3. ↑ 3.0 3.1 Cowley, A. P.; Bidelman, W. P. (February 1979), "MK spectral types for some F and G stars", Publications of the Astronomical Society of the Pacific 91: 83–86, doi:10.1086/130446, Bibcode: 1979PASP...91...83C. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal 150 (3): 88, doi:10.1088/0004-6256/150/3/88, Bibcode: 2015AJ....150...88L. 
  5. ↑ 5.0 5.1 Liu, Y. J. et al. (April 2014), "The Lithium Abundances of a Large Sample of Red Giants", The Astrophysical Journal 785 (2): 12, doi:10.1088/0004-637X/785/2/94, 94, Bibcode: 2014ApJ...785...94L. 
  6. ↑ "78 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=78+Cnc. 



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