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