My Geminorum
Star μ Geminorum |
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Left μ Geminorum, in the middle the supernova remnant IC 443 , right η Geminorum | |||||||||||||||||||||
AladinLite | |||||||||||||||||||||
Observation dates equinox : J2000.0 , epoch : J2000.0 |
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Constellation | Twins | ||||||||||||||||||||
Right ascension | 06 h 22 m 57.63 s | ||||||||||||||||||||
declination | + 22 ° 30 ′ 48.9 ″ | ||||||||||||||||||||
Apparent brightness | 2.87 (2.75 to 3.02) mag | ||||||||||||||||||||
Typing | |||||||||||||||||||||
B − V color index | +1.64 | ||||||||||||||||||||
U − B color index | +1.86 | ||||||||||||||||||||
R − I index | +1.38 | ||||||||||||||||||||
Spectral class | M3 III | ||||||||||||||||||||
Variable star type | SR | ||||||||||||||||||||
Astrometry | |||||||||||||||||||||
Radial velocity | (54.38 ± 0.24) km / s | ||||||||||||||||||||
parallax | (14.08 ± 0.71) mas | ||||||||||||||||||||
distance | (230 ± 15) ly 71 pc |
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Visual absolute brightness M vis | −1.4 mag | ||||||||||||||||||||
Proper movement | |||||||||||||||||||||
Rec. Share: | (+56.39 ± 0.85) mas / a | ||||||||||||||||||||
Dec. portion: | (−110.03 ± 0.51) mas / a | ||||||||||||||||||||
Physical Properties | |||||||||||||||||||||
Dimensions | 2.1 M ☉ | ||||||||||||||||||||
Luminosity |
2750 L ☉ |
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Effective temperature | 3600 K | ||||||||||||||||||||
Metallicity [Fe / H] | +0.11 | ||||||||||||||||||||
Other names and catalog entries |
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My Geminorum ( μ Gem for short , historical proper name Tejat Posterior ) is a red giant of the spectral type M0 about 230 light years away . My Geminorum is a semi-regularly variable star , the apparent magnitude of which varies between 2.75 mag and 3.02 mag.
As a star near the ecliptic, My Geminorum can be covered by the moon and (very rarely) planets .
Web links
Individual evidence
- ↑ a b c d e f g h mu Gem. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed on August 2, 2018 .
- ↑ a b c d mu. According to : VSX. AAVSO, accessed August 2, 2018 .
- ^ A b Ricardo P. Schiavon: Population Synthesis in the Blue. IV. Accurate Model Predictions for Lick Indices and UBV Colors in Single Stellar Populations . In: The Astrophysical Journal Supplement Series . 171, No. 1, July 2007, pp. 146-205. arxiv : astro-ph / 0611464 . bibcode : 2007ApJS..171..146S . doi : 10.1086 / 511753 .
- ↑ Takashi Tsuji: Isotopic abundances of Carbon and Oxygen in Oxygen-rich giant stars (Convection in Astrophysics, Proceedings of IAU Symposium # 239 held August 21-25, 2006 in Prague, Czech Republic) . In: n / a . May 2007, pp. 307-310. arxiv : astro-ph / 0610180 . bibcode : 2007IAUS..239..307T . doi : 10.1017 / S1743921307000622 .
- ^ A b Sushma V. Mallik: Lithium abundance and mass . In: Astronomy and Astrophysics . 352, December 1999, pp. 495-507. bibcode : 1999A & A ... 352..495M .