Omicron Leonis

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Omicron Leonis
Leo constellation map.png
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]
Spectral type F9III/A5mV[2]
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)
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
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
14 Leo, HR 3852, BD+10 2044, HD 83808/83809, SAO 98709, FK5 365, HIP 47508.[1]

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]


  1. ^ a b c d e f g h Database entry for omicron leonis, SIMBAD. Accessed online May 7, 2010.
  2. ^ a b c d e f g h i Refereed paper on the parameters of omicron leonis. Accessed online May 7, 2010.