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.
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Cancer |
Right ascension | 08h 26m 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 | |
Database references | |
SIMBAD | data |
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 temperature of 4,138 K.[7]