Omicron1 Cancri
Star in the constellation Cancer
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Omicron1 Cancri is a solitary,[12] 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.[13]
| 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 | |
| Evolutionary stage | main sequence[4][2] |
| Spectral type | A5 III[5] |
| B−V color index | +0.1540[3] |
| Astrometry | |
| Radial velocity (Rv) | −4.6±2.8[6] 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[7] M☉ |
| Radius | 1.86[8] R☉ |
| Luminosity | 13.4[9] L☉ |
| Surface gravity (log g) | 3.982+0.008 −0.005[10] cgs |
| Temperature | 8,145±3[10] K |
| Metallicity [Fe/H] | −0.85+0.09 −0.04[10] dex |
| Rotational velocity (v sin i) | 90[7] km/s |
| Age | 598[7] Myr |
| Other designations | |
| ο1 Cnc, 62 Cancri, BD+15°1945, HD 76543, HIP 43970, HR 3561, SAO 98247[11] | |
| Database references | |
| SIMBAD | data |
With a stellar classification of A5 III,[5] this presents as an evolved, A-type giant star. At the age of about 600 million years,[7] it has double[7] the mass of the Sun and 1.86 times the Sun's radius.[8] Omicron1 Cancri is radiating 13.4[9] times the solar luminosity from its photosphere at an effective temperature of about 8,145 K.[10] It has a high rate of spin, showing a projected rotational velocity of 90 km/s.[14]
Omicron1 Cancri has an infrared excess, indicating it surrounded by a circumstellar debris disk.[8] The signature matches a two-component disk with the spatially separated belts having temperatures of 146 K and 81 K.[9]