| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h26m 27.70615s[1] |
| Declination | +27° 53′ 36.8867″[1] |
| Apparent magnitude (V) | +5.57[2] |
| Characteristics | |
| Spectral type | K5 III[3] |
| U−B color index | +1.68[2] |
| B−V color index | +1.40[2] |
| Astrometry | |
| Radial velocity (Rv) | +25.25±0.19[4] km/s |
| Proper motion (μ) | RA: −33.28[1] mas/yr Dec.: −116.17[1] mas/yr |
| Parallax (π) | 8.74 ± 0.40 mas[1] |
| Distance | 370 ± 20 ly (114 ± 5 pc) |
| Absolute magnitude (MV) | +0.29[5] |
| Details | |
| Radius | 17[6] R☉ |
| Luminosity | 121[7] L☉ |
| Temperature | 4,138[7] 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 |
Phi1 Cancri, Latinised from φ1 Cancri, is a solitary,[3] orange-hued star in the constellation Cancer. It is faintly visible to the naked eye with an apparent visual magnitude of +5.57.[2] Based upon an annual parallax shift of 8.74 mas,[1] it is approximately 370 light-years from the Sun.
This is an evolved K-type giant star with a stellar classification of K5 III.[3] 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 17 times the radius of the Sun.[6] It is radiating 121 times the Sun's luminosity from its photosphere at an effective temperatureof4,138 K.[7]
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