Gamma Leonis
Binary star in the constellation Leo / From Wikipedia, the free encyclopedia
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Gamma Leonis (γ Leonis, abbreviated Gamma Leo, γ Leo), also named Algieba /ælˈdʒiːbə/,[9][10] is a binary star system in the constellation of Leo. In 2009, a planetary companion around the primary was announced.
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Leo |
Right ascension | 10h 19m 58.35056s[1] |
Declination | +19° 50′ 29.3468″[1] |
Apparent magnitude (V) | 2.08 (2.37/3.64)[2] |
Characteristics | |
Spectral type | K0III + G7III[3] |
U−B color index | 1.00 |
B−V color index | 1.14 |
Variable type | Suspected[4] |
Astrometry | |
Radial velocity (Rv) | −36.24±0.18[5] km/s |
Proper motion (μ) | RA: +304.30[1] mas/yr Dec.: −154.28[1] mas/yr |
Parallax (π) | 25.07 ± 0.52 mas[1] |
Distance | 130 ± 3 ly (39.9 ± 0.8 pc) |
Absolute magnitude (MV) | −0.27/+0.98[6] |
Orbit[7][8] | |
Period (P) | 510.3 yr |
Semi-major axis (a) | 4.24″ |
Eccentricity (e) | 0.845 |
Inclination (i) | 76.0° |
Longitude of the node (Ω) | 143.4° |
Periastron epoch (T) | 1671.3 |
Details | |
γ Leo A | |
Mass | 1.66±0.14[3] M☉ |
Radius | 26.08±0.79[3] R☉ |
Luminosity | 250[3] L☉ |
Surface gravity (log g) | 1.8±0.04[3] cgs |
Temperature | 4457±63[3] K |
Metallicity [Fe/H] | −0.41±0.03[3] dex |
γ Leo B | |
Mass | 1.55±0.08[3] M☉ |
Radius | 10.55±0.29[3] R☉ |
Luminosity | 63.1[3] L☉ |
Surface gravity (log g) | 2.98[6] cgs |
Temperature | 4969±15[3] K |
Metallicity [Fe/H] | –0.38 ± 0.02[3] dex |
Other designations | |
γ Leo A: γ1 Leonis, HD 89484, HR 4057, SAO 81298 | |
γ Leo B: γ2 Leonis, HD 89485, HR 4058, SAO 81299 | |
Database references | |
SIMBAD | data |
Exoplanet Archive | data |
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