| Observation data EpochJ2000.0 EquinoxJ2000.0 (ICRS) | |
|---|---|
| Constellation | Leo |
| Right ascension | 09h 28m 27.39861s[1] |
| Declination | +09° 03′ 24.4255″[1] |
| Apparent magnitude (V) | 5.42[2](5.69 + 7.28)[3] |
| Characteristics | |
| ω Leo A | |
| Evolutionary stage | main sequence[4] |
| Spectral type | G1 V[5] |
| U−Bcolor index | +0.12[2] |
| B−Vcolor index | +0.60[2] |
| Astrometry | |
| Radial velocity (Rv) | −7.6±0.2[6] km/s |
| Proper motion (μ) | RA: +36.98[1]mas/yr Dec.: +5.78[1]mas/yr |
| Parallax (π) | 30.15±1.45 mas[1] |
| Distance | 108 ± 5 ly (33 ± 2 pc) |
| Absolute magnitude (MV) | +2.72[7] |
| Orbit[8] | |
| Period (P) | 42,678.5 days |
| Eccentricity (e) | 0.56 |
| Periastronepoch (T) | 2436769.0 (JD) |
| Argument of periastron (ω) (secondary) | 124.6° |
| Semi-amplitude (K1) (primary) | 2.2 km/s |
| Details | |
| ω Leo A | |
| Mass | 1.35+0.05 −0.03[9] M☉ |
| Luminosity | 6[10] L☉ |
| Surface gravity (log g) | 3.82±0.05[9] cgs |
| Temperature | 5940±85[9] K |
| Metallicity[Fe/H] | 0.02±0.06[9] dex |
| Rotational velocity (v sin i) | 5.1[4] km/s |
| Age | 3.68+0.31 −0.28[9] Gyr |
| Other designations | |
| ω Leo,2 Leo,BD+09°2188,HD 81858,HIP 46454,HR 3754,SAO 117717[11] | |
| Database references | |
| SIMBAD | data |
ω Leonis (Latinised asOmega Leonis, abbreviated to ω Leo or Omega Leo), is astar system located in thezodiacconstellation ofLeo. It is visible to thenaked eye in the absence oflight pollution, with anapparent visual magnitude of about 5.4. The distance to this star, as determined usingparallax measurements, is around 108 light years from theSun. Because of its location close to the ecliptic, it is subject to being obscured bythe Moon, and potentially byplanets.
This is aspectroscopic binary star system with anorbital period of 116.8 years and aneccentricity of 0.56.[8] In 2010, speckleinterferometry observations showed anangular separation of738±10 mas between the two components along aposition angle of102.7°±0.6°.[12] The primary is aG-type main sequence star with aspectral classification of G1 V.[5] It has about 35%[9] more mass than the Sun and shines six[10] times as brightly from anouter atmosphere that has aneffective temperature of 5940 K.[9] The system is roughly 3.7 billion years old[9] and is a member of the galacticthin disk population.[9]
