Phi1 Cancri
Phi1 Cancri, Latinised from φ1 Cancri, is a solitary, orange-hued star in the constellation Cancer. It is faintly visible to the naked eye with an apparent visual magnitude of +5.57. Based upon an annual parallax shift of 8.74 mas, it is approximately 370 light-years from the Sun.
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 26m 27.70615s |
| Declination | +27° 53′ 36.8867″ |
| 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: −33.28 mas/yr Dec.: −116.17 mas/yr |
| Parallax (π) | 8.74 ± 0.40 mas |
| Distance | 370 ± 20 ly (114 ± 5 pc) |
| Absolute magnitude (MV) | +0.29 |
| Details | |
| Radius | 17 R☉ |
| Luminosity | 121 L☉ |
| Temperature | 4,138 K |
| Metallicity [Fe/H] | −0.134±0.093 dex |
| Rotational velocity (v sin i) | 1.3 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is an evolved K-type giant star with a stellar classification of K5 III. 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 17 times the radius of the Sun. It is radiating 121 times the Sun's luminosity from its photosphere at an effective temperature of 4,138 K.
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