46 Cancri is a star in the zodiac constellation of Cancer, located around 680 light years away from the Sun. It is a dim, yellow-hued star, near the lower limits of visibility to the naked eye with an apparent visual magnitude of 6.12.[2] The star is moving closer to the Earth with a heliocentric radial velocity of –13.1 km/s.[2] It has a stellar classification of G5 III,[3] matching an aging giant star that has consumed the hydrogen at its core and evolved away from the main sequence.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 45m 21.42336s[1] |
| Declination | +30° 41′ 51.9066″[1] |
| Apparent magnitude (V) | 6.122[2] |
| Characteristics | |
| Spectral type | G5 III[3] |
| B−V color index | 0.912[2] |
| Astrometry | |
| Radial velocity (Rv) | –13.1[2] km/s |
| Proper motion (μ) | RA: −9.828[1] mas/yr Dec.: +0.916[1] mas/yr |
| Parallax (π) | 4.7700 ± 0.1025 mas[1] |
| Distance | 680 ± 10 ly (210 ± 5 pc) |
| Absolute magnitude (MV) | 0.297[4] |
| Details | |
| Mass | 2.65[2] M☉ |
| Radius | 11[5] R☉ |
| Luminosity | 125.9[2] L☉ |
| Surface gravity (log g) | 2.80[4] cgs |
| Temperature | 4,966±74[2] K |
| Metallicity [Fe/H] | −0.08[4] dex |
| Rotational velocity (v sin i) | 6.6[6] km/s |
| Age | 740[2] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
46 Cancri is 740 million years old with 2.65[2] times the mass of the Sun. It has expanded to about 11[5] times the Sun's radius and is radiating 125.9[2] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,966 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 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 Hoffleit, Dorrit (1964), Catalogue of Bright Stars (3rd ed.), New Haven, Conn.: Yale University Observatory, Bibcode:1964cbs..book.....H.
- ^ a b c Liu, Yujuan; et al. (August 2010), "Stellar Parameters and Abundance Analysis of 58 Late G Giants", Publications of the Astronomical Society of Japan, 62 (4): 1071–1084, Bibcode:2010PASJ...62.1071L, doi:10.1093/pasj/62.4.1071.
- ^ 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.
- ^ De Medeiros, J. R.; et al. (November 2000), "Rotation and lithium in single giant stars", Astronomy and Astrophysics, 363: 239–243, arXiv:astro-ph/0010273, Bibcode:2000A&A...363..239D.
- ^ "46 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-03-06.