Omega Geminorum

ω Geminorum
Location of ω Geminorum (circled)
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]
Distanceapprox. 1,500 ly
(approx. 460 pc)
Absolute magnitude (MV)−3.06[6]
Details
Mass6.3±0.5[3] M☉
Radius72[7] R☉
Luminosity1,813[8] L☉
Surface gravity (log g)2.45[9] cgs
Temperature5,090[9] K
Metallicity [Fe/H]−0.02[9] dex
Rotational velocity (v sin i)10[10] km/s
Age14.8[3] Myr
Other designations
ω Gem, 42 Geminorum, BD+24° 1502, FK5 1182, HD 52497, HIP 33927, HR 2630, SAO 78999.[11]
Database references
SIMBADdata

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.

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]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Argue1966 was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference Tetzlaff2011 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Henriksson1977 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference aa546_A61 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference lang2006 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Mcdonald2012 was invoked but never defined (see the help page).
  9. ^ a b c d Cite error: The named reference Kovtyukh2008 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Bernacca1970 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Gorynya1998 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Richichi2005 was invoked but never defined (see the help page).