Sigma2 Cancri

Sigma² Cancri is a solitary,^[8] white-hued star in the constellation Cancer. Its name is a Bayer designation that is Latinized from σ² Cancri, and abbreviated Sigma² Cnc σ² Cnc. This star is faintly visible to the naked eye, having an apparent visual magnitude of +5.44.^[3] Based upon an annual parallax shift of 17.04 mas as seen from Earth,^[2] this star is located 191 light-years (59 pc) from the Sun. It is drifting closer to the Sun with a radial velocity of −26 km/s.^[5]

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

Sigma² Cancri

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Cancer[1]
Right ascension	08h 56m 56.598s[2]
Declination	+32° 54′ 37.54″[2]
Apparent magnitude (V)	+5.436[3]
Characteristics
Spectral type	A7 IV[4]
B−V color index	+0.157[3]
Astrometry
Radial velocity (Rv)	−26.2±0.7[5] km/s
Proper motion (μ)	RA: −53.031 mas/yr[2] Dec.: −66.186 mas/yr[2]
Parallax (π)	17.0377±0.0716 mas[2]
Distance	191.4 ± 0.8 ly (58.7 ± 0.2 pc)
Absolute magnitude (MV)	+1.57[1]
Details
Mass	1.79[6] M☉
Radius	2.28+0.02 −0.04[2] R☉
Luminosity	21.5[4] L☉
Surface gravity (log g)	4.17[6] cgs
Temperature	8,309±283[6] K
Rotational velocity (v sin i)	133[4] km/s
Age	441[6] Myr
Other designations
σ2 Cnc, 59 Cancri, BD+33°1785, HD 76398, HIP 43932, HR 3555, SAO 61146[7]
Database references
SIMBAD	data

With an estimated age of 441^[6] million years, this is an A-type subgiant star with a stellar classification of A7 IV.^[4] It is spinning rapidly with a projected rotational velocity of 133 km/s.^[4] The star has an estimated 1.8^[6] times the mass of the Sun with 2.3 times the Sun's radius.^[2] It is radiating 21.5^[4] times the Sun's luminosity from its photosphere at an effective temperature of roughly 8,309 K.^[6]