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Name
  T Cep  
AAVSO UID
000-BCN-399 (105792 observations)  
Constellation
Cepheus Sequence
J2000.0
21 09 31.78 +68 29 27.2  (317.38242 +68.49089) Search nearby
B1950.0 21 08 52.83 +68 17 12.9
Proper motion
RA: -43.75 +/- 0.86 mas/yDec: -45.46 +/- 0.81 mas/ySource: F. Van Leeuwen, 2007
Galactic coord. 104.805 +13.845
Other names

(Internal only)
2MASS J21093180+6829268 AAVSO 2108+68 BD+67 1291
HD 202012 HIP 104451 HR 8113
IRC +70168 RAFGL 2721 SAO 19229
TIC 388000857 TYC 4460-2400-1 WISEA J210931.64+682926.7
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Variability type
M
Spectral type M5.5e-M8.8e
Mag. range
5.2 - 11.0 V
Discoverer Vitold Ceraski (1878)
Epoch
26 May 2019 (HJD 2458630.0) Ephemeris
Outburst --
Period 388.9 d
Rise/eclipse dur. 54%  (210 d)
Remarks
Some references may be clicked to view in new window. Roll over index number to view submission details.
1 GCVS Team P var. Max = 2414252 + 386.05d*E (JD2406900 - 20490); Max = 2431086 + 394.93d*E (JD2420490 - 32900); Max = 2440262 + 379.22d*E (JD2432900 - 42200); since JD2442200 Max = 2444171 + 392.7d*E. Mean value of the period is given in the Table. SiO maser.
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References
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1 Cannon, A. J., 1907, Second catalogue of variable stars 1907AnHar..55....1C
2 T. Karlsson, Maxima of Mira stars --
3 General Catalogue of Variable Stars, 4th Edition, Volumes I-III, P.N.
Kholopov et al.		 --
External Links
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Catalog Data
Information from selected catalogs obtained by cross-matching to 2 arc seconds using the CDS X-Match Service. These data may not be complete.
2MASS J = -0.50H = -1.29K = -1.82J - K = 1.33
AllWISE W4 = -3.07
APASS-DR9 B = 8.24V = 7.09g' = 7.40r' = 6.72B - V = 1.15
Images
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Supporting Documents
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Campaigns/Programs
 Legacy LPV Program
 LPV Program
 LPV Humps
Revision History
Currently approved revision is checked. Click revision number to view details of that revision.
4 Otero, Sebastian Alberto 2024-01-19 01:29 UTC Period, epoch and minimum magnitude from AAVSO data.
3 Fernig, Leo 2022-04-22 13:36 UTC Discoverer updated from 1907AnHar..55....1C page 30
2 Admin, VSX 2010-01-05 04:43 UTC Position updated from the GCVS version of November 2009.
1 Admin, VSX 2005-12-18 01:33 UTC Initial upload.

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