Sigma3 Cancri

Sigma³ Cancri is a solitary,^[9] yellow-hued star in the zodiac constellation of Cancer. Its name is a Bayer designation that is Latinized from σ³ Cancri, and abbreviated Sigma³ Cnc or σ³ Cnc. With an apparent visual magnitude of +5.24,^[2] it is a dim star that is visible to the naked eye. Based upon an annual parallax shift of 10.75 mas as seen from Earth,^[6] it is located approximately 303 light-years (93 pc) from the Sun. The star's proper motion makes it a candidate for membership in the IC 2391 supercluster.^[10]

For other stars with this Bayer designation, see σ Cancri.

Sigma³ Cancri

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Cancer
Right ascension	08h 59m 32.655s[1]
Declination	+32° 25′ 06.81″[1]
Apparent magnitude (V)	+5.24[2]
Characteristics
Evolutionary stage	red clump[3]
Spectral type	G9 III[4]
U−B color index	+0.64[2]
B−V color index	+0.91[2]
Astrometry
Radial velocity (Rv)	+20.82±0.21[5] km/s
Proper motion (μ)	RA: −43.741 mas/yr[1] Dec.: −34.754 mas/yr[1]
Parallax (π)	10.7481±0.0965 mas[6]
Distance	303 ± 3 ly (93.0 ± 0.8 pc)
Absolute magnitude (MV)	0.45[7]
Details[5]
Mass	2.81±0.11 M☉
Radius	10.32 R☉
Luminosity	72 L☉
Surface gravity (log g)	3.18 cgs
Temperature	5,170±21 K
Metallicity [Fe/H]	−0.03±0.06 dex
Rotational velocity (v sin i)	2.30±0.47 km/s
Age	420±40 Myr
Other designations
σ3 Cnc, 64 Cancri, BD+32°1821, FK5 1232, GC 12417, HD 76813, HIP 44154, HR 3575, SAO 61177, WDS J08595+3225A[8]
Database references
SIMBAD	data

This is an evolved, G-type giant star with a stellar classification of G9 III.^[4] At the estimated age of 420^[5] million years it is a red clump star on the horizontal branch, which indicates it is generating energy through helium fusion at its core.^[3] Sigma³ Cancri has 2.8 times the mass of the Sun and has expanded to 10.3 times the Sun's radius. It is radiating 72 times the solar luminosity from its photosphere at an effective temperature of 5,170 K.^[5]