T Cephei

From Wikipedia, the free encyclopedia
Jump to: navigation, search
T Cephei
Observation data
Epoch J2000      Equinox J2000
Constellation Cepheus
Right ascension 21h 09m 31.7809s[1]
Declination +68° 29′ 27.204″[1]
Apparent magnitude (V) 7.33[1]
Spectral type M6-9e[1]
U−B color index 0.33[1]
B−V color index 1.49[1]
Variable type Mira[2]
Radial velocity (Rv) -8.03[1] km/s
Proper motion (μ) RA: -43.75[1] mas/yr
Dec.: -45.46[1] mas/yr
Parallax (π) 5.33 ± 0.90[1] mas
Distance approx. 600 ly
(approx. 190 pc)
Absolute magnitude (MV) 0.96[citation needed]
Mass 15-18[citation needed] M
Radius 540-742[citation needed] R
Luminosity 50,000[citation needed] L
Temperature 3,720[citation needed] K
Other designations
T Cephei, GSC 04460-02400, HD 202012, BD+67° 1291, HIC 104451, GC 29611, HIP 104451, HR 8113, SAO 19229

T Cephei is a Mira variable star in the constellation Cepheus. Located approximately 188 parsecs (610 ly) distant, it varies between magnitudes 5.2 and 11.3 over a period of around 388 days.[2]


  1. ^ a b c d e f g h i j "T Cephei". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 1 July 2014. 
  2. ^ a b VSX (4 January 2010). "T Cep". AAVSO Website. American Association of Variable Star Observers. Retrieved 1 July 2014.