Omicron Leonis
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 Omicron Leonis is located to the lower far right on this map of the constellation. | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Leo |
| Right ascension | 09h 41m 09.03s[1] |
| Declination | +09° 53' 32.30"[1] |
| Apparent magnitude (V) | +3.53[1] |
| Characteristics | |
| Spectral type | F9III/A5mV[2] |
| Astrometry | |
| Proper motion (μ) | RA: -143.67[1] mas/yr Dec.: -37.45[1] mas/yr |
| Parallax (π) | 24.12 ± 0.97[1] mas |
| Distance | 135 ly (41.4±0.1[2] pc) |
| Orbit[2] | |
| 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 | |
| Mass | 2.12/1.87 ± 0.01[2] M☉ |
| Radius | 5.9±0.5/2.2±0.3[2] R☉ |
| Luminosity | 39.4±2.4/15.4±1.0 [2] L☉ |
| Temperature | 6,000±200/7,600±400[2] K |
| Age | 8 × 108(estimate)[2] years |
| Other designations | |
Omicron Leonis (ο Leo, ο Leonis), known also by its traditional name, Subra, is a binary star in the constellation of Leo, west of Regulus, some 130 light years from here, where it marks one of the lion's forepaws.
The two stars of Omicron Leonis (Subra-A and Subra-B) are given variably as type F9III giant for the primary and A5mV dwarf for the secondary[2] and subsequently as an F6II bright giant with a companion A7V dwarf star according to Kaler and others. Their combined apparent magnitude is +3.53.[1]
References
- Omicron Leo/Subra in Kaler Stars
- subra (HIP 47508) Relates to the A star, Subra-B
- Subra -Omi Leonis brief data.
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