Lambda Leonis
Orange-hued giant star in the constellation Leo / From Wikipedia, the free encyclopedia
Lambda Leonis (λ Leonis, abbreviated Lam Leo, λ Leo), formally named Alterf /ælˈtərf/,[11][12] is a star in the constellation of Leo. The star is bright enough to be seen with the naked eye, having an apparent visual magnitude of 4.32[2] Based upon an annual parallax shift of 0.00991 arcseconds, it is located about 329 light-years from the Sun. At that distance, the visual magnitude of the star is reduced by an interstellar absorption factor of 0.06 because of extinction.[4]
Quick Facts Constellation, Right ascension ...
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Leo |
Right ascension | 09h 31m 43.22754s[1] |
Declination | +22° 58′ 04.6904″[1] |
Apparent magnitude (V) | 4.32[2] |
Characteristics | |
Spectral type | K4.5 III[3] |
U−B color index | +1.82[2] |
B−V color index | +1.54[2] |
Astrometry | |
Radial velocity (Rv) | 24.27±0.19[4] km/s |
Proper motion (μ) | RA: −20.17[1] mas/yr Dec.: −39.47[1] mas/yr |
Parallax (π) | 9.91 ± 0.18 mas[1] |
Distance | 329 ± 6 ly (101 ± 2 pc) |
Absolute magnitude (MV) | −0.70[5] |
Details | |
Radius | 45[6] R☉ |
Luminosity | 472[7] L☉ |
Surface gravity (log g) | 1.60[8] cgs |
Temperature | 3,900[8] K |
Metallicity [Fe/H] | −0.29[8] dex |
Rotational velocity (v sin i) | 8[9] km/s |
Other designations | |
Database references | |
SIMBAD | data |
Close