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Gamma Cancri
Star system in the constellation Cancer / From Wikipedia, the free encyclopedia
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.[12] 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.[5] In 1910 this star was reported to be a spectroscopic binary by O. J. Lee,[13] but is now considered a single star.[14][15] Since it is near the ecliptic, it can be occulted by the Moon[16] and, very rarely, by planets.
Quick Facts Constellation, Right ascension ...
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Cancer |
Right ascension | 08h 43m 17.14820s[1] |
Declination | +21° 28′ 06.6008″[1] |
Apparent magnitude (V) | 4.673[2] |
Characteristics | |
Spectral type | A1IV[3] |
U−B color index | +0.03[4] |
B−V color index | +0.010[2] |
Astrometry | |
Radial velocity (Rv) | 28.7[5] km/s |
Proper motion (μ) | RA: −103.51[1] mas/yr Dec.: −39.48[1] mas/yr |
Parallax (π) | 18.00 ± 0.21 mas[1] |
Distance | 181 ± 2 ly (55.6 ± 0.6 pc) |
Absolute magnitude (MV) | +1.1[6] |
Details | |
Mass | 2.18[7] M☉ |
Radius | 2.5[8] R☉ |
Luminosity | 36[9] L☉ |
Surface gravity (log g) | 4.17[7] cgs |
Temperature | 9,108[9] K |
Rotational velocity (v sin i) | 86±6[10] km/s |
Age | 171[7] Myr |
Other designations | |
Database references | |
SIMBAD | data |
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