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
Declination +09° 53' 32.30"
Apparent magnitude (V) +3.52[1]
Spectral type F8-G0III/A7m[2]
U−B color index 0.21[1]
B−V color index 0.49[1]
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)
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[4] M
Radius 5.9±0.5/2.2±0.3[4] R
Luminosity 39.4±2.4/15.4±1.0 [4] L
Temperature 6,000±200/7,600±400[4] K
Age 8 × 108(estimate)[4] years
Other designations
14 Leo, HR 3852, BD+10 2044, HD 83808/83809, SAO 98709, FK5 365, HIP 47508.
Database references

Omicron Leonis (ο Leo, ο Leonis), known also by its traditional name, Subra,[5] 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 primary is given the type F8-G0III giant and the secondary (Subra-B) is type A7m dwarf.[4] Their combined apparent magnitude is +3.52.


  1. ^ a b c Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues 2237: 0. Bibcode:2002yCat.2237....0D. 
  2. ^ Ginestet, N.; Carquillat, J. M. (2002). "Spectral Classification of the Hot Components of a Large Sample of Stars with Composite Spectra, and Implication for the Absolute Magnitudes of the Cool Supergiant Components". The Astrophysical Journal Supplement Series 143 (2): 513. Bibcode:2002ApJS..143..513G. doi:10.1086/342942. 
  3. ^ a b c Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. 
  4. ^ a b c d e f g h Hummel, C. A.; Carquillat, J. -M.; Ginestet, N.; Griffin, R. F.; Boden, A. F.; Hajian, A. R.; Mozurkewich, D.; Nordgren, T. E. (2001). "Orbital and Stellar Parameters of Omicron Leonis from Spectroscopy and Interferometry". The Astronomical Journal 121 (3): 1623. doi:10.1086/319391. 
  5. ^ Jim Kaler's website: (online 6th Sep 2015)

External links[edit]