20 Leonis Minoris
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Leo Minor |
| Right ascension | 10h 01m 00.65688s |
| Declination | +31° 55′ 25.2130″ |
| 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: −528.871(92) mas/yr Dec.: −429.376(74) mas/yr |
| Parallax (π) | 66.9958±0.0921 mas |
| Distance | 48.68 ± 0.07 ly (14.93 ± 0.02 pc) |
| Absolute magnitude (MV) | 4.46 |
| Details | |
| 20 LMi A | |
| Mass | 0.967±0.010 M☉ |
| Radius | 1.237±0.019 R☉ |
| Luminosity | 1.365±0.014 L☉ |
| Surface gravity (log g) | 4.25±0.02 cgs |
| Temperature | 5,735±5.6 K |
| Metallicity [Fe/H] | 0.20±0.02 dex |
| Rotation | 10.64±0.14 d |
| Rotational velocity (v sin i) | 2.4±0.5 km/s |
| Age | 6.2–7.7 Gyr |
| 20 LMi B | |
| Mass | 0.11 M☉ |
| Temperature | 3,106(54) K |
| Metallicity [Fe/H] | 0.00(9) dex |
| 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 66.996 mas, it is located 48.7 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 Hδ1. 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.