Pi Leonis
Star in the constellation Leo
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Pi Leonis, Latinised from π Leonis, is a single[11] star in the zodiac constellation Leo. It is a red-hued star that is visible to the naked eye with an apparent visual magnitude of 4.70.[2] This object is located at a distance of some 410 light-years from the Sun based on parallax, and is drifting further away with a radial velocity of +22 km/s.[5] Because the star lies near the ecliptic it is subject to occultations by the Moon.[12]
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Leo |
| Right ascension | 10h 00m 12.80589s[1] |
| Declination | +08° 02′ 39.2032″[1] |
| Apparent magnitude (V) | 4.70[2] |
| Characteristics | |
| Evolutionary stage | AGB[3] |
| Spectral type | M2 III[4] |
| U−B color index | +1.88[2] |
| B−V color index | +1.60[2] |
| Astrometry | |
| Radial velocity (Rv) | 22.36±0.29[5] km/s |
| Proper motion (μ) | RA: −31.41[1] mas/yr Dec.: −22.15[1] mas/yr |
| Parallax (π) | 8.03±0.29 mas[1] |
| Distance | 410 ± 10 ly (125 ± 4 pc) |
| Absolute magnitude (MV) | −0.79[6] |
| Details | |
| Mass | 1.64[7] M☉ |
| Radius | 84.7[7] R☉ |
| Luminosity | 1,077±73[8] L☉ |
| Surface gravity (log g) | 1.028[9] cgs |
| Temperature | 3,757[9] K |
| Metallicity [Fe/H] | +0.447[9] dex |
| Other designations | |
| π Leo, 29 Leonis, BD+08°2301, HD 86663, HIP 49029, HR 3950, SAO 118044[10] | |
| Database references | |
| SIMBAD | data |
This is an evolved, red giant star with a stellar classification of M2 III.[4] With the supply of hydrogen at its core exhausted, it has expanded to 70 times the Sun's radius. The star shines with 1,077 times the luminosity of the Sun from an expanded outer atmosphere that has an effective temperature of 3,757 K. According to the General Catalogue of Variable Stars, it is a suspected variable star with a maximum magnitude of 4.67.[13]