1 Canis Minoris

1 Canis Minoris is a single^[9] star in the equatorial constellation of Canis Minor, located about 287 light years away from the Sun. It is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude of 5.37.^[2] The radial velocity of this object is poorly constrained at −1.0±4.2 km/s.^[2]

1 Canis Minoris

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Canis Minor
Right ascension	07h 24m 58.17971s[1]
Declination	+11° 40′ 10.2843″[1]
Apparent magnitude (V)	5.37[2]
Characteristics
Spectral type	A5 IV[3] or A4 V[4]
B−V color index	0.105±0.006[2]
Astrometry
Radial velocity (Rv)	−1.0±4.2[2] km/s
Proper motion (μ)	RA: −15.263[1] mas/yr Dec.: −15.625[1] mas/yr
Parallax (π)	11.3473±0.1958 mas[1]
Distance	287 ± 5 ly (88 ± 2 pc)
Absolute magnitude (MV)	0.44[2]
Details
Mass	2.15[5] M☉
Radius	4.6[6] R☉
Luminosity	66.3+3.8 −3.6[7] L☉
Surface gravity (log g)	3.87[5] cgs
Temperature	8,374±285[5] K
Rotational velocity (v sin i)	159[7] km/s
Age	716[5] Myr
Other designations
1 CMi, BD+11°1578, GC 9891, HD 58187, HIP 35987, HR 2820, SAO 96871[8]
Database references
SIMBAD	data

Cowley et al. (1969) listed a stellar classification of A5 IV^[3] for 1 Canis Minoris, matching an A-type subgiant star that has exhausted the hydrogen at its core and is evolving into a giant. However, Gray and Garrison (1989) catalogued it as an A-type main-sequence star with a class of A4 V.^[4] The Hipparcos team used a class of A3 Vn,^[2] where the 'n' indicates "nebulous" lines due to rapid rotation.

This star is estimated to be 716^[5] million years old and is at or near the end of its main sequence lifetime.^[7] It has a high rate of spin, showing a projected rotational velocity of 159 km/s.^[7] The star has more than double^[5] the mass of the Sun with about 4.6^[6] times the Sun's radius. It is radiating 66^[7] times the Sun's luminosity from its photosphere at an effective temperature of 8,374 K.^[5]