Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Leo Minor |
Right ascension | 10h 01m 00.65688s[1] |
Declination | +31° 55′ 25.2130″[1] |
Apparent magnitude (V) | +5.40[2] |
Characteristics | |
Spectral type | G3 Va Hδ1[3] + M7 V[4] |
U−B color index | +0.27[5] |
B−V color index | +0.65[5] |
Astrometry | |
Radial velocity (Rv) | +55.96±0.09[6] km/s |
Proper motion (μ) | RA: −528.871(92) mas/yr[1] Dec.: −429.376(74) mas/yr[1] |
Parallax (π) | 66.9958 ± 0.0921 mas[1] |
Distance | 48.68 ± 0.07 ly (14.93 ± 0.02 pc) |
Absolute magnitude (MV) | 4.46[7] |
Details | |
20 LMi A | |
Mass | 0.967±0.010[8] M☉ |
Radius | 1.237±0.019[8] R☉ |
Luminosity | 1.365±0.014[8] L☉ |
Surface gravity (log g) | 4.25±0.02[8] cgs |
Temperature | 5,735±5.6[9] K |
Metallicity [Fe/H] | 0.20±0.02[8] dex |
Rotation | 10.64±0.14 d[2] |
Rotational velocity (v sin i) | 2.4±0.5[8] km/s |
Age | 6.2–7.7[10] Gyr |
20 LMi B | |
Mass | 0.11[11] M☉ |
Rotation | 19.2687 d[4] |
Other designations | |
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.[2] Based upon an annual parallax shift of 66.996 mas, it is located 48.7 light-years from the Sun. The star has a relatively high proper motion[3] and is moving away from the Sun with a radial velocity of +56 km/s.[6] The system made its closest approach about 150,000 years ago when it came within 32.2 ly (9.86 pc).[13]
The primary member of this system is a G-type main-sequence star with a stellar classification of G3 Va Hδ1.[3] It has 12% more mass and a 25% larger radius than the Sun. The star is about seven[10] billion years old and is spinning with a rotation period of 10.6 days.[2] The small companion is an active red dwarf star that has a relatively high metallicity.[14] The two stars are currently separated by 14.5 arc seconds, corresponding to a projected separation of 2016 AU.[11]
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