Astronomy:60 Cancri
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 55m 55.54693s[1] |
| Declination | +11° 37′ 33.6990″[1] |
| Apparent magnitude (V) | +5.44[2] |
| Characteristics | |
| Evolutionary stage | giant |
| Spectral type | K5 III[3][2][4] |
| B−V color index | 1.462±0.004[2] |
| Astrometry | |
| Radial velocity (Rv) | +25.38±0.16[1] km/s |
| Proper motion (μ) | RA: −15.443[1] mas/yr Dec.: −13.539[1] mas/yr |
| Parallax (π) | 3.8596 ± 0.1340[1] mas |
| Distance | 850 ± 30 ly (259 ± 9 pc) |
| Details[5] | |
| Mass | 1.42±0.45 M☉ |
| Radius | 54[6] R☉ |
| Luminosity | 669.87[2] L☉ |
| Surface gravity (log g) | 1.28±0.11 cgs |
| Temperature | 4,150±92 K |
| Metallicity [Fe/H] | −0.01±0.05 dex |
| Age | 1.15+0.67 −0.43 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
60 Cancri is a star in the zodiac constellation Cancer, located about 850 light years away from the Sun. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of +5.44.[2] 60 Cancri is situated near the ecliptic, so it is subject to the occasional occultation by the Moon.[7] It is moving away from the Earth with a heliocentric radial velocity of +25 km/s.[1]
This is an aging giant star with a stellar classification of K5 III,[3] indicating it has exhausted the hydrogen at its core and evolved off the main sequence. It is a suspected variable star of unknown type.[8] The interferometry-measured angular diameter of the primary component, after correcting for limb darkening, is 1.94±0.02 mas,[9] which, at its estimated distance, equates to a physical radius of about 54 times the radius of the Sun.[6] It is around 1.15 billion years old with 1.4 times the mass of the Sun.[5] The star is radiating 670[2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,150 K.[5]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 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 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 Adams, Walter S. et al. (April 1935), "The Spectroscopic Absolute Magnitudes and Parallaxes of 4179 Stars", Astrophysical Journal 81: 187, doi:10.1086/143628, Bibcode: 1935ApJ....81..187A.
- ↑ 4.0 4.1 "60 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=60+Cnc.
- ↑ 5.0 5.1 5.2 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.
- ↑ 6.0 6.1 Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1, https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41. The radius (R*) is given by:
- [math]\displaystyle{ \begin{align} 2\cdot R_* & = \frac{(10^{-3}\cdot 259.1\cdot 1.94)\ \text{AU}}{0.0046491\ \text{AU}/R_{\bigodot}} \\ & \approx 108\cdot R_{\bigodot} \end{align} }[/math]
- ↑ White, Nathaniel M.; Feierman, Barry H. (September 1987), "A Catalog of Stellar Angular Diameters Measured by Lunar Occultation", Astronomical Journal 94: 751, doi:10.1086/114513, Bibcode: 1987AJ.....94..751W.
- ↑ Samus N. N. et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1 61 (1): 80–88, doi:10.1134/S1063772917010085, Bibcode: 2017ARep...61...80S.
- ↑ Richichi, A. et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics 431 (2): 773–777, doi:10.1051/0004-6361:20042039, Bibcode: 2005A&A...431..773R
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