1 Cancri

1 Cancri is a single^[2] star in the zodiac constellation of Cancer, positioned near the border with Gemini at a distance of around 467 light years from the Sun. It is barely visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 5.97. The object is moving further from the Earth with a heliocentric radial velocity of +14 km/s.

1 Cancri

Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Cancer
Right ascension	07h 56m 59.45262s[1]
Declination	+15° 47′ 25.0019″[1]
Apparent magnitude (V)	5.97[2]
Characteristics
Spectral type	K3− III[3]
B−V color index	1.285±0.007[4]
Astrometry
Radial velocity (Rv)	+13.55±0.12[1] km/s
Proper motion (μ)	RA: −26.731[1] mas/yr Dec.: −42.7591[1] mas/yr
Parallax (π)	6.9810±0.0694 mas[1]
Distance	467 ± 5 ly (143 ± 1 pc)
Absolute magnitude (MV)	0.03[4]
Details
Mass	1.1[5] M☉
Radius	18.7[6] R☉
Luminosity	199[1] L☉
Surface gravity (log g)	2.03[7] cgs
Temperature	4,231[7] K
Metallicity [Fe/H]	−0.01[7] dex
Other designations
1 Cnc, BD+16°1590, FK5 1208, HD 64960, HIP 38848, HR 3095, SAO 97399[8]
Database references
SIMBAD	data

This is an evolved giant star with a stellar classification of K3− III,^[3] having exhausted the hydrogen at its core and expanded. It is specified as a spectral standard for that type.^[3] The angular diameter of the star measured from a lunar occultation is 2.1±0.6 mas,^[9] which, at its estimated distance, equates to a physical radius of about 19 times the radius of the Sun. It is radiating 199 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,231 K.