12 Cancri
Star in the constellation Cancer
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12 Cancri is a star in the zodiac constellation Cancer. It has an apparent visual magnitude of 6.25,[2] placing just below the normal limit for stars visible to the naked eye in good seeing conditions. The star displays an annual parallax shift of 12.7 mas as seen from Earth's orbit, which places it at a distance of about 257 light-years. It is moving toward the Sun with a radial velocity of around −10 km/s.[4]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 08m 42.4457s[1] |
| Declination | +13° 38′ 27.307″[1] |
| Apparent magnitude (V) | 6.25[2] |
| Characteristics | |
| Spectral type | F3 V[3] |
| B−V color index | 0.480±0.007[2] |
| Astrometry | |
| Radial velocity (Rv) | −10.0±4.3[4] km/s |
| Proper motion (μ) | RA: +2.776[1] mas/yr Dec.: −14,723[1] mas/yr |
| Parallax (π) | 12.7085±0.1327 mas[1] |
| Distance | 257 ± 3 ly (78.7 ± 0.8 pc) |
| Absolute magnitude (MV) | 1.59[5] |
| Details | |
| Mass | 1.16[6] M☉ |
| Luminosity | 17.94[2] L☉ |
| Surface gravity (log g) | 3.60±0.14[6] cgs |
| Temperature | 6,357±88[7] K |
| Metallicity [Fe/H] | 0.04[7] dex |
| Rotational velocity (v sin i) | 52.3±4.1[5] km/s |
| Age | 2.466[6] Gyr |
| Other designations | |
| 12 Cnc, BD+14°1831, HD 67483, HIP 39874, HR 3184, SAO 97594[8] | |
| Database references | |
| SIMBAD | data |
This is an ordinary F-type main-sequence star with a stellar classification of F3 V,[3] which indicates it is generating energy through hydrogen fusion at its core. It is spinning with a projected rotational velocity of 52[5] km/s and appears to be undergoing solar-like differential rotation with relative rate of α = 0.33±0.13.[9] The star is about 2.5[6] billion years old with 1.16[6] times the mass of the Sun and is radiating nearly 18[2] times the Sun's luminosity from its photosphere at an effective temperature of around 6,357 K.[7]