Omicron1 Cancri

Omicron¹ Cancri is a solitary,^[11] white-hued star in the zodiac constellation of Cancer. Its name is a Bayer designation that is Latinized from ο¹ Cancri, and abbreviated Omicron¹ Cancri or ο¹ Cnc. This star is faintly visible to the naked eye with an apparent visual magnitude of +5.20.^[3] Based upon an annual parallax shift of 20.33 mas as seen from Earth,^[2] it is located 160 light-years (49 pc) away from the Sun. It most likely forms a co-moving pair with Omicron² Cancri.^[12]

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

Omicron¹ Cancri

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Cancer[1]
Right ascension	08h 57m 14.950s[2]
Declination	+15° 19′ 21.96″[2]
Apparent magnitude (V)	+5.20[3]
Characteristics
Spectral type	A5 III[4]
B−V color index	+0.1540[3]
Astrometry
Radial velocity (Rv)	−4.6±2.8[5] km/s
Proper motion (μ)	RA: +60.732 mas/yr[2] Dec.: +20.396 mas/yr[2]
Parallax (π)	20.3294±0.0891 mas[2]
Distance	160.4 ± 0.7 ly (49.2 ± 0.2 pc)
Absolute magnitude (MV)	+1.92[1]
Details
Mass	2.02[6] M☉
Radius	1.86[7] R☉
Luminosity	13.4[8] L☉
Surface gravity (log g)	3.982+0.008 −0.005[9] cgs
Temperature	8,145±3[9] K
Metallicity [Fe/H]	−0.85+0.09 −0.04[9] dex
Rotational velocity (v sin i)	90[6] km/s
Age	598[6] Myr
Other designations
ο1 Cnc, 62 Cancri, BD+15°1945, HD 76543, HIP 43970, HR 3561, SAO 98247[10]
Database references
SIMBAD	data

With a stellar classification of A5 III,^[4] this presents as an evolved, A-type giant star. At the age of about 600 million years,^[6] it has double^[6] the mass of the Sun and 1.86 times the Sun's radius.^[7] Omicron¹ Cancri is radiating 13.4^[8] times the solar luminosity from its photosphere at an effective temperature of about 8,145 K.^[9] It has a high rate of spin, showing a projected rotational velocity of 90 km/s.^[13]

Omicron¹ Cancri has an infrared excess, indicating it surrounded by a circumstellar debris disk.^[7] The signature matches a two-component disk with the spatially separated belts having temperatures of 146 K and 81 K.^[8]