Gamma Cancri
Gamma Cancri, or γ Cancri, is a star in the northern constellation of Cancer. It is formally named Asellus Borealis /əˈsɛləs bɒriˈælɪs/, the traditional name of the system. Based on parallax measurements, it is located at a distance of approximately 181 light years 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 and, very rarely, by planets.
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 43m 17.14820s |
| Declination | +21° 28′ 06.6008″ |
| 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: −103.51 mas/yr Dec.: −39.48 mas/yr |
| Parallax (π) | 18.00 ± 0.21 mas |
| Distance | 181 ± 2 ly (55.6 ± 0.6 pc) |
| Absolute magnitude (MV) | +1.1 |
| Details | |
| Mass | 2.18 M☉ |
| Radius | 2.5 R☉ |
| Luminosity | 36 L☉ |
| Surface gravity (log g) | 4.17 cgs |
| Temperature | 9,108 K |
| Rotational velocity (v sin i) | 86±6 km/s |
| Age | 171 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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