Upsilon1 Cancri

Upsilon¹ Cancri, Latinised from υ¹ Cancri, is the Bayer designation for a solitary,^[3] yellow-white-hued star in the constellation Cancer. It is faintly visible with the naked eye, having an apparent visual magnitude of +5.7.^[2] Based upon an annual parallax shift of 13.05 mas as seen from Earth,^[1] this system is roughly 250 light-years from the Sun.

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

Upsilon¹ Cancri

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Cancer
Right ascension	08h 31m 30.51925s[1]
Declination	+24° 04′ 51.9890″[1]
Apparent magnitude (V)	+5.694[2]
Characteristics
Spectral type	F0 IIIn[3]
B−V color index	+0.309[2]
Astrometry
Radial velocity (Rv)	+19.0±4.3[4] km/s
Proper motion (μ)	RA: −81.36[1] mas/yr Dec.: −44.57[1] mas/yr
Parallax (π)	13.05±0.29 mas[1]
Distance	250 ± 6 ly (77 ± 2 pc)
Absolute magnitude (MV)	+1.29[5]
Details
Mass	1.47[6] M☉
Luminosity	25[5] L☉
Surface gravity (log g)	3.51[7] cgs
Temperature	7,240±246[6] K
Rotational velocity (v sin i)	109.2[7] km/s
Age	570[6] Myr
Other designations
υ1 Cnc, 30 Cancri, BD+24° 1940, FK5 2666, HD 72041, HIP 41816, HR 3355, SAO 80229[8]
Database references
SIMBAD	data

This object has a stellar classification of F0 IIIn, indicating it is an F-type giant star.^[3] The 'n' suffix indicates "nebulous" absorption lines due to rapid rotation, and it shows a relatively high projected rotational velocity of 109.2 km/s.^[7] It is a variable star of unknown type that varies in brightness with an amplitude of 0.05 magnitude.^[9] The star is about 570^[6] million years old and it has an estimated mass of 1.47^[6] times that of the Sun. On average, it is radiating 25^[5] times the Sun's luminosity from its photosphere at an effective temperature of 7,240 K.^[6]