| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Leo |
| Right ascension | 09h 43m 43.90499s[1] |
| Declination | +14° 01′ 18.1033″[1] |
| Apparent magnitude (V) | 5.38[2] |
| Characteristics | |
| Spectral type | M2 IIIab[3] |
| U−B color index | +1.95[2] |
| B−V color index | +1.60[2] |
| Astrometry | |
| Radial velocity (Rv) | 10.31±0.41[4] km/s |
| Proper motion (μ) | RA: −344.28[1] mas/yr Dec.: −47.65[1] mas/yr |
| Parallax (π) | 34.49 ± 0.20 mas[1] |
| Distance | 94.6 ± 0.5 ly (29.0 ± 0.2 pc) |
| Absolute magnitude (MV) | −1.39[5] |
| Details | |
| Luminosity | 903[6] L☉ |
| Temperature | 3,756[6] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
ψ Leonis (Latinised as Psi Leonis, abbreviated to ψ Leo or psi Leo), is a solitary[3] star located in the zodiac constellation of Leo, to the east-northeast of Regulus. It is faintly visible to the naked eye with an apparent visual magnitude of 5.38.[2] Based upon stellar parallax measurements,[1] it is located around 95 light years from the Sun. At that distance, the visual magnitude of the star is diminished by an absorption factor of 0.3 due to interstellar dust.[5]
Psi Leonis is an evolved red giant star with a stellar classification of M2 IIIab.[3] It shines with a luminosity over 900 times that of the Sun from a relatively cool outer atmosphere that has an effective temperature of 3,756.[6] It is a suspected variable star with a measured brightness variation of 0m.018.[8] Psi Leonis has a magnitude 11.63 visual companion at an angular separation of 281.60 arcseconds along a position angle of 139°, as of 2000.[9]
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