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 | |
Evolutionary stage | Red clump (both stars)[3] |
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[3] | |
γ Leo A | |
Mass | 1.66±0.14 M☉ |
Radius | 26.08±0.79 R☉ |
Luminosity | 250 L☉ |
Surface gravity (log g) | 1.8±0.04 cgs |
Temperature | 4457±63 K |
Metallicity [Fe/H] | −0.41±0.03 dex |
Rotational velocity (v sin i) | 1.41 km/s |
Age | 1.75±0.43 Gyr |
γ Leo B | |
Mass | 1.55±0.08 M☉ |
Radius | 10.55±0.29 R☉ |
Luminosity | 63.1 L☉ |
Surface gravity (log g) | 2.56±0.04 cgs |
Temperature | 4969±15 K |
Metallicity [Fe/H] | –0.38 ± 0.02 dex |
Rotational velocity (v sin i) | 1.62 km/s |
Age | 2.12±0.33 Gyr |
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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