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ω Geminorum
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Location of ω Geminorum (circled)
Constellation	Gemini
Right ascension	07^h 02^m 24.78033^s^[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 (R_v)	−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 (M_V)	−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
ω Gem, 42 Geminorum, BD+24° 1502, FK5 1182, HD 52497, HIP 33927, HR 2630, SAO 78999.^[11]
Database references
SIMBAD	data

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]

References

^ ^a ^b ^c ^d ^e ^f 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, S2CID 18759600.
^ ^a ^b ^c ^d Argue, A. N. (1966), "UBV photometry of 550 F, G and K type stars", Monthly Notices of the Royal Astronomical Society, 133 (4): 475–493, Bibcode:1966MNRAS.133..475A, doi:10.1093/mnras/133.4.475.
^ ^a ^b ^c ^d ^e Tetzlaff, N.; et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x, S2CID 118629873.
^ ^a ^b Henriksson, G. (January 1977), "Low amplitude variable stars", Astronomy and Astrophysics, 54: 309–310, Bibcode:1977A&A....54..309H.
^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
^ ^a ^b Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, vol. 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1. The radius (R_*) is given by:
${\begin{aligned}2\cdot R_{*}&={\frac {(457\cdot 1.47\cdot 10^{-3})\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 144\cdot R_{\bigodot }\end{aligned}}$
^ ^a ^b McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
^ ^a ^b ^c ^d Kovtyukh, V. V.; et al. (September 2008), "Reddenings of FGK supergiants and classical Cepheids from spectroscopic data", Monthly Notices of the Royal Astronomical Society, 389 (3): 1336–1344, arXiv:0807.2057, Bibcode:2008MNRAS.389.1336K, doi:10.1111/j.1365-2966.2008.13644.x, S2CID 119204089.
^ Bernacca, P. L.; Perinotto, M. (1970), "A catalogue of stellar rotational velocities", Contributi Osservatorio Astronomico di Padova in Asiago, 239 (1): 1, Bibcode:1970CoAsi.239....1B.
^ "ome Gem -- Cepheid variable Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2016-12-09.
^ Gorynya, N. A.; et al. (November 1998), "A catalog of Cepheid radial velocities measured in 1995-1998 with the correlation spectrometer", Astronomy Letters, 24 (6): 815–818, Bibcode:1998AstL...24..815G.
^ Richichi, A.; et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039

External links

Kaler, James B., "Omega Geminorum", Stars, University of Illinois, retrieved 2016-12-10.

Constellation of Gemini

Stars

Bayer	α (Castor) β (Pollux) γ (Alhena) δ (Wasat) ε (Mebsuta) ζ (Mekbuda) η (Propus) θ ι κ λ μ (Tejat) ν ξ (Alzirr) ο (Jishui) π ρ σ τ υ φ χ ω
Flamsteed	1 3 6 25 30 37 38 (e) 57 (A) 64 (b¹) 65 (b) 74 (f) 81 (g)
Variable	R U TV BG DM DN OU WY V429
HR	2877
HD	44780 50554 63433 260655
Other	2MASS 0727+1710 CXOU J061705.3+222127 Geminga Gliese 251 HAT-P-20 HAT-P-24 HAT-P-33 LB-1 PSR J0659+1414 WD J0651+2844 WISEP J060738.65+242953.4

Exoplanets	HAT-P-24b HAT-P-50b HD 50554 b HD 59686 Ab Pollux b τ Geminorum b

Star
clusters

NGC	2129 2158 2266 2277 2355
Other	Koposov 2 Messier 35

Nebulae	IC 443 IC 444 Medusa Nebula NGC 2371-2 NGC 2392

Galaxies

NGC	2291 2294 2357

Astronomical events	GRB 070125

Omega Geminorum

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References

External links