T Cephei

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T Cephei
Region of NGC 7023 (Digitized Sky Survey 2).jpg
Region of NGC 7023, with T Cephei marked on the full-size image
Credit: NASA, ESA and Digitized Sky Survey 2
Observation data
Epoch J2000      Equinox J2000
Constellation Cepheus
Right ascension 21h 09m 31.78348s[1]
Declination +68° 29′ 27.2311″[1]
Apparent magnitude (V) 5.2 - 11.3[2]
Evolutionary stage AGB[3]
Spectral type M6-9e[4]
U−B color index +0.33[5]
B−V color index +1.49[5]
Variable type Mira[3]
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]
Distance600 ± 40 ly
(180 ± 10 pc)
Mass0.55[7] M
[8] R
Luminosity5,700[9] L
Temperature2,400[9] - 3,347[10] K
Other designations
T Cephei, HR 8113, HD 202012, HIP 104451, BD+67°1291, GC 29611, SAO 19229, GSC 04460-02400
Database references
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 600 light-years (180 parsecs) distant, it varies between magnitudes 5.2 and 11.3 over a period of around 388 days.[9][2]

T Cephei is a red giant of spectral type M6-9e with an effective temperature 2,400 K, a radius of 329 R, a mass of 0.55 M, and a luminosity of 5,700 L. 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, blowing off its own atmosphere to form a white dwarf in a distant future.

See also[edit]


  1. ^ a b c d e Vallenari, A.; et al. (Gaia Collaboration) (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. arXiv:2208.00211. doi:10.1051/0004-6361/202243940. Gaia DR3 record for this source at VizieR.
  2. ^ a b VSX (4 January 2010). "T Cep". AAVSO Website. American Association of Variable Star Observers. Retrieved 1 July 2014.
  3. ^ a b Danilovich, T.; Ramstedt, S.; Gobrecht, D.; Decin, L.; De Beck, E.; Olofsson, H. (2018). "Sulphur-bearing molecules in AGB stars". Astronomy & Astrophysics. 617: A132. arXiv:1807.05144. doi:10.1051/0004-6361/201833317. S2CID 119225670.
  4. ^ Keenan, Philip C.; Garrison, Robert F.; Deutsch, Armin J. (1974). "Revised Catalog of Spectra of Mira Variables of Types ME and Se". Astrophysical Journal Supplement. 28: 271. Bibcode:1974ApJS...28..271K. doi:10.1086/190318.
  5. ^ a b Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  6. ^ Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters". Astronomy and Astrophysics. 430: 165. arXiv:astro-ph/0409579. Bibcode:2005A&A...430..165F. doi:10.1051/0004-6361:20041272. S2CID 17804304.
  7. ^ Tuchman, Y. (1991). "The mode of pulsation in Mira variables determined by the observed acceleration data". The Astrophysical Journal. 383: 779. Bibcode:1991ApJ...383..779T. doi:10.1086/170836.
  8. ^ Weigelt, Gerd; Beckmann, Udo; Berger, Jean-Philippe; Bloecker, Thomas; Brewer, Michael K.; Hofmann, Karl-Heinz; Lacasse, Marc G.; Malanushenko, Victor; Millan-Gabet, Rafael; et al. (2003). "JHK-band spectro-interferometry of T Cep with the IOTA interferometer". In Traub, Wesley A (ed.). Interferometry for Optical Astronomy II. Proc. SPIE. Vol. 4838. Society of Photo-optical Instrumentation Engineers (SPIE). pp. 181–184. Bibcode:2003SPIE.4838..181W. doi:10.1117/12.458659. ISBN 9780819446176. S2CID 123045204.
  9. ^ a b c Danilovich, T.; Teyssier, D.; Justtanont, K.; Olofsson, H.; Cerrigone, L.; Bujarrabal, V.; Alcolea, J.; Cernicharo, J.; Castro-Carrizo, A.; García-Lario, P.; Marston, A. (2015). "New observations and models of circumstellar CO line emission of AGB stars in the Herschel SUCCESS programme". Astronomy & Astrophysics. 581: A60. arXiv:1506.09065. Bibcode:2015A&A...581A..60D. doi:10.1051/0004-6361/201526705. S2CID 55109956.
  10. ^ Guha Niyogi, Suklima; Speck, Angela K.; Onaka, Takashi (2011). "A Temporal Study of the Oxygen-rich Pulsating Variable Asymptotic Giant Branch Star, T Cep: Investigation on Dust Formation and Dust Properties". The Astrophysical Journal. 733 (2): 93. arXiv:1103.5040. Bibcode:2011ApJ...733...93G. doi:10.1088/0004-637X/733/2/93. S2CID 118332811.
  11. ^ "Download Data". aavso.org. AAVSO. Retrieved 1 October 2021.

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