Phi1 Cancri
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 26m 27.706s |
| Declination | +27° 53′ 36.89″ |
| Apparent magnitude (V) | +5.57 |
| Characteristics | |
| Spectral type | K5 III |
| U−B color index | +1.68 |
| B−V color index | +1.40 |
| Astrometry | |
| Radial velocity (Rv) | +25.25±0.19 km/s |
| Proper motion (μ) | RA: −33.427 mas/yr Dec.: −115.457 mas/yr |
| Parallax (π) | 7.5571±0.0757 mas |
| Distance | 432 ± 4 ly (132 ± 1 pc) |
| Absolute magnitude (MV) | +0.29 |
| Details | |
| Mass | 1.27+1.21 −0.45 M☉ |
| Radius | 27 R☉ |
| Luminosity | 195+14 −13 L☉ |
| Temperature | 4,100±80 K |
| Metallicity [Fe/H] | −0.134±0.093 dex |
| Rotational velocity (v sin i) | 1.3 km/s |
| Other designations | |
| φ1 Cnc, 22 Cancri, BD+28°1602, FK5 2656, HD 71093, HIP 41377, HR 3304, SAO 80181 | |
| Database references | |
| SIMBAD | data |
Phi1 Cancri is a solitary, orange-hued star in the constellation Cancer. Its name is a Bayer designation that is Latinized from φ1 Cancri, and abbreviated Phi1 Cnc or φ1 Cnc. This star is faintly visible to the naked eye with an apparent visual magnitude of +5.57. Based upon an annual parallax shift of 7.56 mas, it is approximately 432 light-years (132 pc) distant from the Sun. The star is drifting further away with a line of sight velocity of +25 km/s.
This is an evolved K-type giant star with a stellar classification of K5 III, having exhausted the hydrogen at its core then expanded off from the main sequence. The measured angular diameter of this star, after correction for limb darkening, is 1.87±0.02 mas. At the estimated distance of Phi1 Cancri, this yields a physical size of about 27 times the radius of the Sun. It has 1.3 times the mass of the Sun and is radiating 195 times the Sun's luminosity from its photosphere at an effective temperature of 4,100 K.