46 Cancri

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.

46 Cancri

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
46 Cnc, BD+31°1876, FK5 2690, HD 74485, HIP 42954, HR 3464, SAO 61029[7]
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

1. 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.
2. 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.
3. Hoffleit, Dorrit (1964), Catalogue of Bright Stars (3rd ed.), New Haven, Conn.: Yale University Observatory, Bibcode:1964cbs..book.....H.
4. 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.
5. 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.
6. 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.
7. "46 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-03-06.