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T Cephei
	; 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
Declination	+68° 29′ 27.2311″
Apparent magnitude (V)	5.2 - 11.3
Characteristics
Evolutionary stage	AGB
Spectral type	M6-9e
U−B color index	+0.33
B−V color index	+1.49
Variable type	Mira
Astrometry
Radial velocity (Rv)	−8.03 km/s
Proper motion (μ)	RA: −44.210 mas/yr ; Dec.: −44.921 mas/yr
Parallax (π)	5.4400 ± 0.3476 mas
Distance	600 ± 40 ly ; (180 ± 10 pc)
Details
Mass	0.55 M☉
Radius	329+70; −50 R☉
Luminosity	5,700 L☉
Temperature	2,400 - 3,347 K
Other designations
	T Cephei, HR 8113, HD 202012, HIP 104451, BD+67°1291, GC 29611, SAO 19229, GSC 04460-02400
Database references
SIMBAD	data

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.

References

^ ^a ^b ^c ^d ^e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
^ ^a ^b VSX (4 January 2010). "T Cep". AAVSO Website. American Association of Variable Star Observers. Retrieved 1 July 2014.
^ ^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.
^ 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.
^ ^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.
^ 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.
^ 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.
^ 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.
^ ^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.
^ 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.
^ "Download Data". aavso.org. AAVSO. Retrieved 1 October 2021.