Astronomy:57 Cancri
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Short description: Star in the constellation Cancer
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 54m 14.73274s[1] |
| Declination | +30° 34′ 44.8283″[1] |
| Apparent magnitude (V) | +5.40[2] (6.09 + 6.37)[3] |
| Characteristics | |
| Spectral type | G7 III + K0 III[4] |
| B−V color index | 1.05[2] |
| Astrometry | |
| Radial velocity (Rv) | −59.2±0.4[2] km/s |
| Proper motion (μ) | RA: +41.60[1] mas/yr Dec.: −24.02[1] mas/yr |
| Parallax (π) | 7.07 ± 0.68[1] mas |
| Distance | 460 ± 40 ly (140 ± 10 pc) |
| Absolute magnitude (MV) | –0.33[2] |
| Details[5] | |
| 57 Cnc A | |
| Mass | 6.49±2.16 M☉ |
| Luminosity | 173.13[2] L☉ |
| Surface gravity (log g) | 2.74±0.11 cgs |
| Temperature | 4,810±92 K |
| Metallicity [Fe/H] | 0.08±0.05 dex |
| Age | 645+154 −120 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
57 Cancri is a double star in the zodiac constellation of Cancer, located around 460 light years away from the Sun.[1] They are visible to the naked eye as a faint star with a combined apparent visual magnitude of +5.40.[2] The brighter member, designated component A. is a yellow-hued giant star with a stellar classification of G7 III[4] and an apparent magnitude of +6.09.[3] Its companion, component B, is an orange-hued giant with a class of K0 III[4] and an apparent magnitude of +6.37.[3] As of 2017, the pair had an angular separation of 1.50″ along a position angle of 310°.[3]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 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 3.2 3.3 Mason, B. D. et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal 122 (6): 3466, doi:10.1086/323920, Bibcode: 2001AJ....122.3466M
- ↑ 4.0 4.1 4.2 Abt, Helmut A. (2008), "Visual Multiples. IX. MK Spectral Types", The Astrophysical Journal Supplement Series 176 (1): 216–217, doi:10.1086/525529, Bibcode: 2008ApJS..176..216A.
- ↑ Feuillet, Diane K. et al. (2016), "Determining Ages of APOGEE Giants with Known Distances", The Astrophysical Journal 817 (1): 40, doi:10.3847/0004-637X/817/1/40, Bibcode: 2016ApJ...817...40F.
- ↑ "57 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=57+Cnc.
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