T Cephei

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Template:Short description

T Cephei
File:TCepheiLocation.jpg
Region of NGC 7023, T Cephei is marked with a green arrow
Credit: NASA, ESA and Digitized Sky Survey 2
Observation data
Epoch J2000      Equinox J2000
Constellation Cepheus
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 5.2 - 11.3[2]
Characteristics
Evolutionary stage AGB[3]
Spectral type M6-9e[4]
U−B Template:Engvar +0.33[5]
B−V Template:Engvar +1.49[5]
Variable type Mira[3]
Astrometry
Radial velocity (Rv)−8.03[6] km/s
Proper motion (μ) RA: −44.210[1] mas/yr
Dec.: −44.921[1] mas/yr
Parallax (π)5.4400±0.3476 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Details
Mass0.55[7] Template:Solar mass
RadiusScript error: No such module "val".[8] Template:Solar radius
Luminosity5,700[9] Template:Solar luminosity
Temperature2,400[9] - 3,347[10] K
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
T Cephei, HR 8113, HD 202012, HIP 104451, BD+67°1291, GC 29611, SAO 19229, GSC 04460-02400
Database references
SIMBADdata

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File:TCepLightCurve.png
The visual band light curve of T Cephei, from AAVSO data[11]

T Cephei is a Mira variable star in the constellation Cepheus. Located approximately Script error: No such module "convert". distant, it varies between magnitudes 5.2 and 11.3 over a period of around 388 days.[9][2] When it is near its maximum brightness, it is faintly visible to the naked eye under good observing conditions.

Vitold Ceraski announced his discovery that the star is a variable star, in 1879.[12] It appeared with its variable star designation, T Cephei, in Annie Jump Cannon's 1907 publication Second catalogue of variable stars.[13] T Cephei is a red giant of spectral type M6-9e with an effective temperature 2,400 K, a radius of Template:Solar radius, a mass of Template:Solar mass, and a luminosity of Template:Solar luminosity. If it were in the place of the Sun, its photosphere would at least engulf the orbit of Mars. This star is believed to be in a late stage of its life, the asymptotic giant branch phase, blowing off its own atmosphere to form a white dwarf in a distant future.

See also

References

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  1. ↑ a b c d e Template:Cite Gaia DR3
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  5. ↑ a b Script error: No such module "Citation/CS1".
  6. ↑ Script error: No such module "Citation/CS1".
  7. ↑ Script error: No such module "Citation/CS1".
  8. ↑ Script error: No such module "citation/CS1".
  9. ↑ a b c Script error: No such module "Citation/CS1".
  10. ↑ Script error: No such module "Citation/CS1".
  11. ↑ Script error: No such module "citation/CS1".
  12. ↑ Script error: No such module "Citation/CS1".
  13. ↑ Script error: No such module "Citation/CS1".

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External links

Template:Stars of Cepheus

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