79 Cancri

79 Cancri is a star in the constellation Cancer, located 400 light years from the Sun.^[1] It is just visible to the naked eye as a dim, yellow-hued star with an apparent visual magnitude of 6.04.^[2] This object is gradually moving slower to the Earth with a heliocentric radial velocity of −3.2 km/s.^[1]

79 Cancri

Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Cancer
Right ascension	09h 10m 20.85841s[1]
Declination	+21° 59′ 47.1000″[1]
Apparent magnitude (V)	6.04[2]
Characteristics
Evolutionary stage	giant
Spectral type	G5 III[3]
B−V color index	0.871[4]
Astrometry
Radial velocity (Rv)	−3.24±0.13[1] km/s
Proper motion (μ)	RA: +2.933[1] mas/yr Dec.: +5.027[1] mas/yr
Parallax (π)	8.1569±0.0676 mas[1]
Distance	400 ± 3 ly (123 ± 1 pc)
Absolute magnitude (MV)	0.78[2]
Details
Mass	2.30[4] M☉
Radius	9.41+0.38 −0.57[1] R☉
Luminosity	57.6±0.6[1] L☉
Surface gravity (log g)	2.88[5] cgs
Temperature	5,076±47[4] K
Metallicity [Fe/H]	−0.10[5] dex
Age	770[4] Myr
Other designations
79 Cnc, BD+22°2063, GC 12655, HD 78715, HIP 45033, HR 3640, SAO 80674, WDS 09103+2200[6]
Database references
SIMBAD	data

This is an aging giant star with a stellar classification of G5 III,^[3] which indicates that, at the age of 770^[4] million years, it has exhausted the hydrogen at its core and evolved away from the main sequence. The star has 2.30^[4] times the mass of the Sun and has expanded to 9.4^[1] times the Sun's radius. It is radiating 58^[1] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 5,076 K.^[4]