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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