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79 Cancri 
Summary
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]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| 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 mas[1] |
| Distance | 400 ± 3 ly (123 ± 1 pc) |
| Absolute magnitude (MV) | 0.78[2] |
| Details | |
| Mass | 2.30[4] M☉ |
| Radius | 9.41+0.38 −0.57[1] R☉ |
| Luminosity | 57.6±0.6[1] L☉ |
| Surface gravity (log g) | 2.88[5] cgs |
| Temperature | 5,076±47[4] K |
| Metallicity [Fe/H] | −0.10[5] dex |
| Age | 770[4] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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 edit
- ^ a b c d e f g h i j k l 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.
- ^ a b c 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.
- ^ a b 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, Bibcode:1979PASP...91...83C, doi:10.1086/130446.
- ^ a b c d e f g 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.
- ^ a b Liu, Y. J.; et al. (April 2014), "The Lithium Abundances of a Large Sample of Red Giants", The Astrophysical Journal, 785 (2): 12, arXiv:1404.1687, Bibcode:2014ApJ...785...94L, doi:10.1088/0004-637X/785/2/94, S2CID 119226316, 94.
- ^ "78 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-03-11.