57 Cancri
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 54m 14.73274s |
| Declination | +30° 34′ 44.8283″ |
| Apparent magnitude (V) | +5.40 (6.09 + 6.37) |
| Characteristics | |
| Spectral type | G7 III + K0 III |
| B−V color index | 1.05 |
| Astrometry | |
| Radial velocity (Rv) | −59.2±0.4 km/s |
| Proper motion (μ) | RA: +41.60 mas/yr Dec.: −24.02 mas/yr |
| Parallax (π) | 7.07±0.68 mas |
| Distance | 460 ± 40 ly (140 ± 10 pc) |
| Absolute magnitude (MV) | –0.33 |
| Details | |
| 57 Cnc A | |
| Mass | 6.49±2.16 M☉ |
| Luminosity | 173.13 L☉ |
| Surface gravity (log g) | 2.74±0.11 cgs |
| Temperature | 4,810±92 K |
| Metallicity [Fe/H] | 0.08±0.05 dex |
| Age | 645+154 −120 Myr |
| Other designations | |
| 57 Cnc, BD+31°1907, GC 12289, HD 75959, HIP 43721, HR 3532, SAO 61125, ADS 7071, WDS J08542+3035 | |
| Database references | |
| SIMBAD | data |
57 Cancri is a double star in the zodiac constellation of Cancer, located around 460 light years away from the Sun. They are visible to the naked eye as a faint star with a combined apparent visual magnitude of +5.40. The brighter member, designated component A. is a yellow-hued giant star with a stellar classification of G7 III and an apparent magnitude of +6.09. Its companion, component B, is an orange-hued giant with a class of K0 III and an apparent magnitude of +6.37. As of 2017, the pair had an angular separation of 1.50″ along a position angle of 310°.