Beta Cancri
Star in the constellation Cancer / From Wikipedia, the free encyclopedia
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Beta Cancri (β Cancri, abbreviated Beta Cnc, β Cnc), also named Tarf /ˈtɑːrf/,[10] is the brightest star in the zodiacal constellation of Cancer. It has an apparent visual magnitude of +3.5[2] and an absolute magnitude of −1.2.[6] Based on parallax measurements obtained during the Hipparcos mission, it is approximately 290 light-years distant from the Sun.[1] An exoplanet, designated Beta Cancri b, is believed to be orbiting the star.[11]
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Cancer |
Right ascension | 08h 16m 30.9206s[1] |
Declination | +09° 11′ 07.961″[1] |
Apparent magnitude (V) | 3.50 - 3.58[2] |
Characteristics | |
Spectral type | K4III Ba1[3] |
U−B color index | +1.77[4] |
B−V color index | +1.48[4] |
Variable type | Suspected[2] |
Astrometry | |
Radial velocity (Rv) | 22.94[5] km/s |
Proper motion (μ) | RA: −46.80[1] mas/yr Dec.: −48.65[1] mas/yr |
Parallax (π) | 11.23 ± 0.97 mas[1] |
Distance | 290 ± 30 ly (89 ± 8 pc) |
Absolute magnitude (MV) | −1.218[6] |
Details | |
Mass | 1.7±0.1[7] M☉ |
Radius | 47.2±1.3[7] R☉ |
Luminosity | 794[7] L☉ |
Surface gravity (log g) | 1.5[8] cgs |
Temperature | 4092.1±17.5[7] K |
Metallicity [Fe/H] | -0.29±0.06[7] dex |
Rotational velocity (v sin i) | 3.7±0.8[7] km/s |
Age | 1.85±0.34[7] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Close
Beta Cancri has a companion listed and together they are designated WDS J08165+0911. As the primary, Beta Cancri bears the designation WDS J08165+0911A.[9] The companion is designated WDS J08165+0911B.[12]