Omicron Leonis
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Leo |
| Right ascension | 09h 41m 09.032s |
| Declination | +09° 53′ 32.31″ |
| Apparent magnitude (V) | +3.52 |
| Characteristics | |
| Spectral type | F8-G0III + A7m |
| U−B color index | 0.21 |
| B−V color index | 0.49 |
| Astrometry | |
| Proper motion (μ) | RA: -143.20 mas/yr Dec.: -37.20 mas/yr |
| Parallax (π) | 24.412±0.081 mas |
| Distance | 133.53±0.45 ly (40.96±0.14 pc) |
| Absolute magnitude (MV) | +0.51 |
| Orbit | |
| Primary | Aa |
| Name | Ab |
| Period (P) | 14.498068(6) days |
| Semi-major axis (a) | 0.1834±0.0007 AU |
| Eccentricity (e) | 0.0007±0.0004 |
| Inclination (i) | 57.8±0.2° |
| Longitude of the node (Ω) | 191.6±0.1° |
| Periastron epoch (T) | 2450623.9(9) days |
| Argument of periastron (ω) (secondary) | 214±22° |
| Semi-amplitude (K1) (primary) | 54.75±0.02 km/s |
| Semi-amplitude (K2) (secondary) | 61.66±0.02 km/s |
| Details | |
| ο Leo Aa | |
| Mass | 2.074±0.013 M☉ |
| Radius | 5.73±0.34 R☉ |
| Luminosity | 41.1+5.8 −5.1 L☉ |
| Temperature | 6,107±93 K |
| Metallicity [Fe/H] | 0.11±0.10 dex |
| Age | 1.06±0.03 Gyr |
| ο Leo Ab | |
| Mass | 1.841±0.011 M☉ |
| Radius | 2.43±0.35 R☉ |
| Luminosity | 17.8+5.7 −4.3 L☉ |
| Temperature | 7,600±200 K |
| Metallicity [Fe/H] | 0.11±0.10 dex |
| Age | 1.06±0.03 Gyr |
| Other designations | |
| Subra, ο Leo, 14 Leo, BD+10 2044, FK5 365, HD 83808, HD 83809, HIP 47508, HR 3852, SAO 98709 | |
| Database references | |
| SIMBAD | data |
Omicron Leonis (ο Leonis, abbreviated Omicron Leo, ο Leo) is a binary star in the constellation of Leo, west of Regulus, some 130 light-years from the Sun, where it marks one of the lion's forepaws. The position of this system near the ecliptic means it is subject to lunar occultation.
The system consists of Omicron Leonis Aa (officially named Subra /ˈsuːbrə/, the traditional name for the system) and Omicron Leonis Ab.