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Star in the constellation Gemini From Wikipedia, the free encyclopedia
Omega Geminorum, Latinized from ω Geminorum, is a star located in the middle of the northern zodiac constellation of Gemini. With an apparent visual magnitude of 5.18,[2] it is faintly visible to the naked eye. According to the Bortle scale, it can be viewed from dark suburban skies. With an annual parallax shift of just 2.19 mas,[1] it is located about 1,500 light years from the Sun.
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Gemini |
Right ascension | 07h 02m 24.78033s[1] |
Declination | +24° 12′ 55.6051″[1] |
Apparent magnitude (V) | 5.18[2] |
Characteristics | |
Spectral type | G5 II[3] |
U−B color index | +0.68[2] |
B−V color index | +0.95[2] |
Variable type | Cepheid?[4] |
Astrometry | |
Radial velocity (Rv) | −9.10±0.40[5] km/s |
Proper motion (μ) | RA: −6.74[1] mas/yr Dec.: -0.25[1] mas/yr |
Parallax (π) | 2.19 ± 0.26 mas[1] |
Distance | approx. 1,500 ly (approx. 460 pc) |
Absolute magnitude (MV) | −3.06[6] |
Details | |
Mass | 6.3±0.5[3] M☉ |
Radius | 72[7] R☉ |
Luminosity | 1,813[8] L☉ |
Surface gravity (log g) | 2.45[9] cgs |
Temperature | 5,090[9] K |
Metallicity [Fe/H] | −0.02[9] dex |
Rotational velocity (v sin i) | 10[10] km/s |
Age | 14.8[3] Myr |
Other designations | |
Database references | |
SIMBAD | data |
This is an evolved bright giant star with a stellar classification of G5 II.[3] It is positioned near the instability strip and in 1977 was listed as a candidate cepheid variable star[12] with a luminosity amplitude of 0.086 and a period of 0.7282 days.[4] The interferometer-measured angular diameter of this star is 1.47±0.21 mas.[13] At its estimated distance, this yields a physical size of about 72 times the radius of the Sun.[7] It has 6.3[3] times the mass of the Sun and radiates 1,813[8] times the solar luminosity from its outer atmosphere at an effective temperature of 5,090 K.[9]
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