Delta3 Canis Minoris

Delta³ Canis Minoris is a solitary,^[9] white-hued star in the equatorial constellation of Canis Minor. Its name is a Bayer designation that is Latinized from δ³ Canis Minoris, and abbreviated Delta³ CMi or δ³ CMi. With an apparent visual magnitude of +5.81,^[2] it is just bright enough to be faintly visible to the naked eye. Based upon a parallax of 4.60 mas as seen from Gaia spacecraft,^[1] this star is about 730 light years away from the Solar System. At that distance, the visual magnitude of these stars is diminished by an extinction of more than 0.15 due to interstellar dust.^[5] It is drifting further away with a line of sight velocity of 34 km/s.^[4]

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

δ³ Canis Minoris

Location of δ3 Canis Minoris (circled)
Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Canis Minor
Right ascension	07h 34m 15.893s[1]
Declination	+03° 22′ 18.21″[1]
Apparent magnitude (V)	+5.81[2]
Characteristics
Evolutionary stage	Main sequence
Spectral type	B9 V[3]
U−B color index	−0.09[2]
B−V color index	−0.02[2]
Astrometry
Radial velocity (Rv)	33.8±2.9[4] km/s
Proper motion (μ)	RA: −2.534 mas/yr[1] Dec.: −5.305 mas/yr[1]
Parallax (π)	4.603±0.0452 mas[1]
Distance	709 ± 7 ly (217 ± 2 pc)
Absolute magnitude (MV)	+0.77[5]
Details
Mass	3.16±0.09[6] M☉
Radius	2.1[7] R☉
Luminosity	175[6] L☉
Temperature	9,908[6] K
Rotational velocity (v sin i)	259[6] km/s
Age	310[5] Myr
Other designations
δ3 CMi, 9 CMi, BD+03°1719, GC 10128, HD 60357, HIP 36812, HR 2901, SAO 115644, CCDM 07343+0322, WDS J07343+0322A[8]
Database references
SIMBAD	data

This is a B-type main-sequence star with a stellar classification of B9 V.^[3] At the estimated age of 310 million years,^[5] it is about 93.7%±2.9% of the way through its main sequence lifetime and is spinning rapidly with a projected rotational velocity of 259 km/s.^[6] The star has an estimated 3.16^[6] times the mass of the Sun and about 2.1^[7] times the Sun's radius. It is radiating 175 times the Sun's luminosity from its photosphere at an effective temperature of 9,908 K.^[6]