Phi1 Cancri

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]

For other stars with this Bayer designation, see φ Cancri.

Phi¹ Cancri

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]