Phi1 Cancri
Star in the constellation Cancer
From Wikipedia, the free encyclopedia
Phi1 Cancri is a solitary,[4] 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.[3] Based upon an annual parallax shift of 7.56 mas,[2] 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.[5]
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Cancer[1] |
| Right ascension | 08h 26m 27.706s[2] |
| Declination | +27° 53′ 36.89″[2] |
| Apparent magnitude (V) | +5.57[3] |
| Characteristics | |
| Spectral type | K5 III[4] |
| U−B color index | +1.68[3] |
| B−V color index | +1.40[3] |
| Astrometry | |
| Radial velocity (Rv) | +25.25±0.19[5] km/s |
| Proper motion (μ) | RA: −33.427 mas/yr[2] Dec.: −115.457 mas/yr[2] |
| Parallax (π) | 7.5571±0.0757 mas[2] |
| Distance | 432 ± 4 ly (132 ± 1 pc) |
| Absolute magnitude (MV) | +0.29[1] |
| Details | |
| Mass | 1.27+1.21 −0.45[6] M☉ |
| Radius | 27[7] R☉ |
| Luminosity | 195+14 −13[6] L☉ |
| Temperature | 4,100±80[6] K |
| Metallicity [Fe/H] | −0.134±0.093[8] dex |
| Rotational velocity (v sin i) | 1.3[9] km/s |
| Other designations | |
| φ1 Cnc, 22 Cancri, BD+28°1602, FK5 2656, HD 71093, HIP 41377, HR 3304, SAO 80181[10] | |
| Database references | |
| SIMBAD | data |
This is an evolved K-type giant star with a stellar classification of K5 III,[4] 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.[11] At the estimated distance of Phi1 Cancri, this yields a physical size of about 27 times the radius of the Sun.[7] 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.[6]
