My Geminorum

from Wikipedia, the free encyclopedia
Star
μ Geminorum
Left μ Geminorum, in the middle the supernova remnant IC 443, right η Geminorum
Left μ Geminorum, in the middle the supernova remnant IC 443 , right η Geminorum
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
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
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 ☉

Effective temperature 3600  K
Metallicity [Fe / H] +0.11
Other names
and catalog entries
Bayer name μ Geminorum
Flamsteed name 13 Geminorum
Bonn survey BD + 22 ° 1304
Bright Star Catalog HR 2286 [1]
Henry Draper Catalog HD 44478 [2]
Hipparcos catalog HIP 30343 [3]
SAO catalog SAO 78297 [4]
Tycho catalog TYC 1878-1429-1 [5]
2MASS catalog 2MASS J06225762 + 2230490 [6]
Other names FK5  241

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

  1. ↑ a b c d e f g h mu Gem. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed on August 2, 2018 .
  2. ↑ a b c d mu. According to : VSX. AAVSO, accessed August 2, 2018 .
  3. ^ 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 .
  4. ↑ 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 .
  5. ^ A b Sushma V. Mallik: Lithium abundance and mass . In: Astronomy and Astrophysics . 352, December 1999, pp. 495-507. bibcode : 1999A & A ... 352..495M .