20 Leonis Minoris

20 Leonis Minoris
Observation data; Epoch J2000 Equinox J2000
Constellation	Leo Minor
Right ascension	10h 01m 00.65765s
Declination	+31° 55′ 25.2151″
Apparent magnitude (V)	+5.40
Characteristics
Spectral type	G3 Va Hδ1 + M7 V
U−B color index	+0.27
B−V color index	+0.65
Astrometry
Radial velocity (Rv)	+55.96±0.09 km/s
Proper motion (μ)	RA: −527.63±0.30 mas/yr ; Dec.: −429.42±0.18 mas/yr
Parallax (π)	66.46 ± 0.32 mas
Distance	49.1 ± 0.2 ly ; (15.05 ± 0.07 pc)
Absolute magnitude (MV)	4.46
Details
20 LMi A
Mass	1.12 M☉
Radius	1.247±0.021 R☉
Luminosity	1.378±0.027 L☉
Temperature	5,735±5.6 K
Rotation	10.64±0.14 d
Age	6.2–7.7 Gyr
20 LMi B
Mass	0.11 M☉
Rotation	19.2687 d
Other designations
	20 LMi, BD+32° 1964, FK5 1258, GJ 376, HD 86728, HIP 49081, HR 3951, SAO 61808, LHS 2216, LTT 12671
Database references
SIMBAD	data

20 Leonis Minoris is a binary star system in the northern constellation of Leo Minor. It is faintly visible to the naked eye, having an apparent visual magnitude of +5.4. Based upon an annual parallax shift of 66.46 mas, it is located 49 light years from the Sun. The star has a relatively high proper motion and is moving away from the Sun with a radial velocity of +56 km/s. The system made its closest approach about 150,000 years ago when it came within 32.2 ly (9.86 pc).

The primary member of this system is a G-type main-sequence star with a stellar classification of G3 Va H_δ1. It has 12% more mass and a 25% larger radius than the Sun. The star is about seven billion years old and is spinning with a rotation period of 10.6 days. The small companion is an active red dwarf star that has a relatively high metallicity. The two stars are currently separated by 14.5 arc seconds, corresponding to a projected separation of 2016 AU.

In 2020, a candidate exoplanet was detected orbiting 20 Leonis Minoris (HD 86728). With a minimum mass of 0.032 M_J (10.2 M_E) and an orbital period of 31 days, this would most likely be a hot Neptune.

The 20 Leonis Minoris planetary system
Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b (unconfirmed)	≥0.032+0.005 −0.005 M_J	0.2003+0.00007 −0.00007	31.15+0.02 −0.02	0.2+0.2 −0.1	—	—

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