Psi Leonis
Star in the constellation Leo
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ψ Leonis (Latinised as Psi Leonis, abbreviated to ψ Leo or Psi Leo), is a solitary[4] 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 610 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]
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Leo |
| Right ascension | 09h 43m 43.90682s[1] |
| Declination | +14° 01′ 18.1311″[1] |
| Apparent magnitude (V) | 5.38[2] |
| Characteristics | |
| Evolutionary stage | AGB[3] |
| Spectral type | M2 IIIab[4] |
| U−B color index | +1.95[2] |
| B−V color index | +1.60[2] |
| Astrometry | |
| Radial velocity (Rv) | 10.98±0.18[1] km/s |
| Proper motion (μ) | RA: +1.614 mas/yr[1] Dec.: −2.014 mas/yr[1] |
| Parallax (π) | 5.3048±0.0890 mas[1] |
| Distance | 610 ± 10 ly (189 ± 3 pc) |
| Absolute magnitude (MV) | −1.39[5] |
| Details | |
| Mass | 1.3[6] M☉ |
| Radius | 62[7] R☉ |
| Luminosity | 903[8] L☉ |
| Surface gravity (log g) | 1.97[6] cgs |
| Temperature | 3,857[7] K |
| Metallicity [Fe/H] | −0.29[6] dex |
| Other designations | |
| ψ Leo, 16 Leo, BD+14°2136, FK5 1252, HD 84194, HIP 47723, HR 3866, SAO 98733[9] | |
| Database references | |
| SIMBAD | data |
Psi Leonis is an evolved red giant star with a stellar classification of M2 IIIab.[4] 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 K.[8] It is a suspected variable star with a measured brightness variation of 0m.018.[10] 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.[11]