Delta2 Canis Minoris

Delta² Canis Minoris is a single star in the constellation Canis Minor. Its name is a Bayer designation that is Latinized from δ² Canis Minoris, and abbreviated Delta² CMi or δ² CMi. An apparent visual magnitude of 5.57^[2] means it is deemed visible to the naked eye but faint and requires a dark sky to view.^[11] Based on parallax measurements it is calculated to be 141 light-years (43 pc) distant from the Earth.^[1] It is drifting further away from the Sun with a line of sight velocity of +3 km/s.^[1]

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

δ² Canis Minoris

Location of δ2 Canis Minoris (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Canis Minor
Right ascension	07h 33m 11.666s[1]
Declination	+03° 17′ 25.37″[1]
Apparent magnitude (V)	5.571[2]
Characteristics
Spectral type	F2 V[3]
U−B color index	+0.10[4]
B−V color index	+0.31[4]
Astrometry
Radial velocity (Rv)	+3.40±0.24[1] km/s
Proper motion (μ)	RA: –15.909 mas/yr[1] Dec.: 42.696 mas/yr[1]
Parallax (π)	23.1488±0.0622 mas[1]
Distance	140.9 ± 0.4 ly (43.2 ± 0.1 pc)
Absolute magnitude (MV)	3.01[5]
Details
Mass	1.63[6] M☉
Radius	1.855[7] R☉
Luminosity	10[8] L☉
Surface gravity (log g)	4.15[9] cgs
Temperature	7,378±251[9] K
Rotational velocity (v sin i)	113[6] km/s
Age	874[9] Myr
Other designations
δ2 Canis Minoris, 8 Canis Minoris, BD+03°1715, GC 10104, HD 60111, HIP 36723, HR 2887, SAO 115610[10]
Database references
SIMBAD	data

The star figures from this part of the Milky Way galaxy as the more central of three that share the Delta designation (the greek-lettered catalog is that of Johann Bayer's 1603 Uranometria atlas of bright stars) in star atlases very close, southwest of Delta³ Canis Minoris which is physically unrelated. The Flamsteed designation for this star is 8 Canis Minoris in John Flamsteed's 1712 star catalog.

Properties

This star is rotating rapidly; the projected rotational velocity is 117.6 km/s,^[12] which means that the equator of this star is rotating at this velocity or greater. By comparison, the Sun is a slow rotator with an equatorial azimuthal velocity of 2 km/s.^[13] δ² Canis Minoris has a stellar classification of F2 V,^[3] indicating that this is an F-type main-sequence star that is generating energy at its core through thermonuclear fusion of hydrogen. The effective temperature of the photosphere is about 7053 K,^[14] giving it the yellow-white hue that is characteristic of F-type stars.^[15] The radius of this star can be estimated indirectly based upon the measured brightness and color information, which suggests the star is about 86% larger than the Sun.^[7]

As of 2008, no companion has been suspected or found orbiting δ² Canis Minoris.^[8][16]