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Name
  U Cep  
AAVSO UID
000-BBC-297 (23180 observations)  
Constellation
Cepheus Sequence
J2000.0
01 02 18.44 +81 52 32.1  (15.57683 +81.87558) Search nearby
B1950.0 00 57 44.95 +81 36 24.2
Proper motion
RA: 23.890 +/- 0.030 mas/yDec: -4.305 +/- 0.030 mas/ySource: Gaia DR1
Galactic coord. 123.338 +19.012
Other names

(Internal only)
AAVSO 0053+81 ADS 830 A ASASSN-V J010218.13+815232.4
BD+81 25 HD 5679 HIP 4843
SAO 168    
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Variability type
DPV:/EA
Spectral type B7Ve+G8III-IV
Mag. range
6.75 - 9.24 V
Discoverer Vitold Ceraski (1880)
Epoch
18 Jul 2014 (HJD 2456857.45665) Ephemeris
Outburst --
Period 2.493087 d
Rise/eclipse dur. 15%  (8.98 h)
Remarks
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1 Otero, Sebastian Alberto Long period cycle varies (Mennickent, 2017).
2 GCVS Team VB A (B 11.83m, 13.9", 62deg; C 12.3m, 23.0", 318deg). 0.010P <= d <= 0.040P. Min II 6.93. P var. Min I = 2407890.3346 + 2.4928551d*E + 5.15d*10**(-9)*E**2 (JD2388855 - 2440790) [M.A.Svechnikov, L.P.Surkova, V.M.Danilov, Perem. Zvezdy 18, N3, 237, 1971.]; analysis of period variations in this interval see also in [D.S.Hall, AA 25, N1, 1, 1975.]; Min I = 2441395.3604 + 2.4931048d*E (JD2440790 - 41600); Min I = 2441679.5716 + 2.4930432d*E (JD2441600 - 950); Min I = 2443753.7982 + 2.4930679d*E (JD2442100 - 43800); since JD2444000 - see Table. Shape of the light curve and depth of minima vary. Brightness of the secondary (G8) varies sporadically. Subgiant brightening accompanies eruptive mass transfer. The gaseous stream moving to the primary (B7) component forms around it gaseous ring or disc [E.C.Olson, ApJ 250, 704, 1981.].
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References
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1 Mennickent, R. E., 2017, Long photometric cycles in hot Algols (Invited
review)		 --
2 Bob Nelson's O-C files, 2016 --
3 E.C.Olson, R.C.Crawford, D.S.Hall, H.Louth, N.L.Markworth, V.Piirola, PASP
93, 464, 1981.		 1981PASP...93..464O
4 Cannon, A. J., 1907, Second catalogue of variable stars 1907AnHar..55....1C
5 J.G.Hagen, ASV IV, 1907. --
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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 = 6.47H = 6.36K = 6.25J - K = 0.22
AllWISE W1 = 6.22W2 = 6.28W3 = 6.30W4 = 6.18W1 - W2 = -0.06W3 - W4 = 0.11
APASS-DR9 B = 8.51V = 6.96g' = 8.65r' = 7.06i' = 7.20B - V = 1.55
Images
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Supporting Documents
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Revision History
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5 Fernig, Leo 2022-02-18 22:10 UTC Discoverer updated from 1907AnHar..55....1C page 7
4 Otero, Sebastian Alberto 2019-06-08 02:58 UTC Type from Mennickent, 2017.
3 Otero, Sebastian Alberto 2017-02-17 01:35 UTC Period from AAVSO data. Epoch from Bob Nelson's O-C files (2016).
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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