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39 Cancri 
Summary
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]
| 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] |
| Distance | 614 ± 7 ly (188 ± 2 pc) |
| Details | |
| Mass | 2.88[2] M☉ |
| Radius | 12[4] R☉ |
| Luminosity | 105[2] L☉ |
| Surface gravity (log g) | 2.70±0.11[5] cgs |
| Temperature | 4,954±25[2] K |
| Metallicity [Fe/H] | +0.21±0.05[5] dex |
| Age | 460[2] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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 edit
- ^ 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.
- ^ 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.
- ^ 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.
- ^ a b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (Third ed.): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
- ^ 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.
- ^ "39 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-03-03.