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Omicron Leonis
Multiple star in the constellation Leo / From Wikipedia, the free encyclopedia
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Omicron Leonis (ο Leonis, abbreviated Omicron Leo, ο Leo) is a multiple star system in the constellation of Leo, west of Regulus, some 130 light-years from the Sun, where it marks one of the lion's forepaws.
Quick Facts Constellation, Right ascension ...
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Leo |
Right ascension | 09h 41m 09.03s |
Declination | +09° 53' 32.30" |
Apparent magnitude (V) | +3.52[1] |
Characteristics | |
Spectral type | F8-G0III + A7m[2] |
U−B color index | 0.21[1] |
B−V color index | 0.49[1] |
Astrometry | |
Proper motion (μ) | RA: -143.20[3] mas/yr Dec.: -37.20[3] mas/yr |
Parallax (π) | 25.03[3] ± 0.22 mas |
Distance | 135 ly (41.4±0.1[4] pc) |
Absolute magnitude (MV) | +0.51[5] |
Orbit[4] | |
Primary | Aa |
Companion | Ab |
Period (P) | 14.498064±0.000009 days |
Semi-major axis (a) | 4.46±0.01 mas |
Eccentricity (e) | 0 |
Inclination (i) | 57.6±0.1° |
Longitude of the node (Ω) | 191.4±0.1° |
Periastron epoch (T) | TJD 10629.831±0.003 |
Details[4] | |
ο Leo Aa | |
Mass | 2.12 M☉ |
Radius | 5.9±0.5 R☉ |
Luminosity | 39.4±2.4 L☉ |
Temperature | 6,000±200 K |
Age | 800(estimate) Myr |
ο Leo Ab | |
Mass | 1.87±0.01 M☉ |
Radius | 2.2±0.3 R☉ |
Luminosity | 15.4±1.0 L☉ |
Temperature | 7,600±400 K |
Other designations | |
Database references | |
SIMBAD | data |
Close
It consists of a binary pair, designated Omicron Leonis A and an optical companion, Omicron Leonis B.[6] A's two components are themselves designated Omicron Leonis Aa (officially named Subra /ˈsuːbrə/, the traditional name for the system)[7][8] and Ab.