Delta1 Canis Minoris

Delta¹ Canis Minoris is a solitary,^[10] yellow-white hued star in the constellation Canis Minor. Its name is a Bayer designation that is Latinized from δ¹ Canis Minoris, and abbreviated Delta¹ CMi or δ¹ CMi. This star is faintly visible to the naked eye with an apparent visual magnitude of +5.25.^[3] Based upon an annual parallax shift of 3.99 mas as seen from Earth,^[2] this star is located roughly 820 light years from the Sun. It is drifting further away with a line of sight velocity of +29 km/s.^[6]

For other stars with this Bayer designation, see δ Canis Minoris.

δ¹ Canis Minoris

Location of δ1 Canis Minoris (circled)
Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Canis Minor[1]
Right ascension	07h 32m 05.949s[2]
Declination	+01° 54′ 52.13″[2]
Apparent magnitude (V)	+5.25[3]
Characteristics
Evolutionary stage	Giant star or main sequence star
Spectral type	F0 III[4] or F0 V[5]
U−B color index	+0.20[3]
B−V color index	+0.22[3]
Astrometry
Radial velocity (Rv)	+29.1±2.8[6] km/s
Proper motion (μ)	RA: −2.129 mas/yr[2] Dec.: −0.868 mas/yr[2]
Parallax (π)	3.9896±0.0775 mas[2]
Distance	820 ± 20 ly (251 ± 5 pc)
Absolute magnitude (MV)	−1.59[1]
Details
Mass	4.34±0.11[2] M☉
Radius	11.6±0.4[2] R☉
Luminosity	542+26 −22[2] L☉
Surface gravity (log g)	3.40±0.05[2] cgs
Temperature	7,210+243 −86[2] K
Metallicity [Fe/H]	+0.15±0.05[7] dex
Rotational velocity (v sin i)	50[8] km/s
Other designations
δ1 CMi, 7 CMi, BD+02°1691, FK5 2587, GC 10085, HD 59881, HIP 36641, HR 2880, SAO 115581[9]
Database references
SIMBAD	data

Houk and Swift (1999) list a stellar classification of F0 V^[5] for Delta¹ Canis Minoris, indicating it is an F-type main-sequence star. However, Cowley et al. (1969) gave it a class of F0 III, which would suggest it is instead an evolved giant star.^[4] The spectrum displays a higher than solar metallicity – a term indicating the abundance of elements other than hydrogen and helium compared to the Sun. The star is spinning with a projected rotational velocity of 50^[8] km/s. Based on stellar models, it has 4.3 times the mass of the Sun and 11.6 times the Sun's radius. It is radiating 542 times the Sun's luminosity from its photosphere at an effective temperature of 7,210 K.^[2]