Astronomy:79 Cancri
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Short description: G-type star in the constellation Cancer
| 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 |
| 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 |
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
- ↑ 1.00 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.
- ↑ 2.0 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.
- ↑ 3.0 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.
- ↑ 4.0 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.
- ↑ 5.0 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.
- ↑ "78 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=78+Cnc.
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