Gamma Cancri
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 43m 17.147s |
| Declination | +21° 28′ 06.60″ |
| Apparent magnitude (V) | 4.673 |
| Characteristics | |
| Spectral type | A1IV |
| U−B color index | +0.03 |
| B−V color index | +0.010 |
| Astrometry | |
| Radial velocity (Rv) | 28.7 km/s |
| Proper motion (μ) | RA: −105.760 mas/yr Dec.: −39.157 mas/yr |
| Parallax (π) | 18.6431±0.1900 mas |
| Distance | 175 ± 2 ly (53.6 ± 0.5 pc) |
| Absolute magnitude (MV) | +1.1 |
| Details | |
| Mass | 2.35±0.42 M☉ |
| Radius | 2.53±0.23 R☉ |
| Luminosity | 43.3±7.9 L☉ |
| Surface gravity (log g) | 4.00±0.25 cgs |
| Temperature | 9,311 K |
| Rotational velocity (v sin i) | 86±6 km/s |
| Age | 171 Myr |
| Other designations | |
| Asellus Borealis, γ Cnc, Gamma Cnc, 43 Cnc, BD+21°1895, FK5 1228, GC 11982, HD 74198, HIP 42806, HR 3449, SAO 80378, CCDM 08433+2128 | |
| Database references | |
| SIMBAD | data |
Gamma Cancri is a star in the northern constellation of Cancer. Its name is a Bayer designation that is Latinized from γ Cancri, and abbreviated Gamma Cnc or γ Cnc. This star is formally named Asellus Borealis, pronouced /əˈsɛləs bɒriˈælɪs/, the traditional name of the system. Based on parallax measurements, it is located at a distance of approximately 175 light-years (54 pc) from the Sun. The star is drifting further away with a radial velocity of 29 km/s.
In 1910 this star was reported to be a spectroscopic binary by O. J. Lee, but is now considered a single star. Since it is near the ecliptic, it can be occulted by the Moon.