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Name
  bet Cep  
AAVSO UID
000-BCN-968 (1893 observations)  
Constellation
Cepheus Sequence
J2000.0
21 28 39.60 +70 33 38.6  (322.16500 +70.56072) Search nearby
B1950.0 21 28 01.38 +70 20 27.5
Proper motion
RA: 12.54 +/- 0.37 mas/yDec: 8.39 +/- 0.27 mas/ySource: F. Van Leeuwen, 2007
Galactic coord. 107.539 +14.026
Other names

(Internal only)
8 Cep 1RXP J212837.4+703335 1RXS J212838.8+703352
1WGA J2128.6+7033 2E 2128.0+7020 2E 4480
2MASS J21283958+7033389 2RXS J212839.3+703350 2XMM J212839.3+703338
3XMM J212839.5+703338 4XMM J212839.5+703339 8 Cep
AAVSO 2127+70 ADS 15032 ADS 15032 A
ALS 14839 Alfirk BD+69 1173
CCDM J21287+7034A EUVE J2128+70.5 GC 30118
GCRV 13520 GSC 04465-02643 Gaia DR3 2272185759996420992
HD 205021 HIP 106032 HR 8238
IRAS 21280+7020 MCW 989 PPM 10863
RAFGL 2768 SAO 10057 SBC7 859
SBC9 1310 TIC 321818578 TYC 4465-2643-1
WDS J21287+7034A WDS J21287+7034Aa,Ab XMMSL1 J212839.0+703335
XMMSL2 J212839.7+703339 XMMSL3 J212839.7+703339  
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Variability type
BCEP
Spectral type B2IIIeV
Mag. range
3.20 - 3.25 V
Discoverer --
Epoch
15 May 2024 (HJD 2460446.232) Ephemeris
Outburst --
Period 0.1904898 d  (4.57176 h)
Rise/eclipse dur. 50%  (2.286 h)
Remarks
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1 Otero, Sebastian Alberto AaAb magnitudes given in the table. Combined range AaAb-B is V= 3.19 - 3.24.
2 GCVS Team VB A (A 6m, 0.204", 47.2deg, 1977.9; B 7.84m, A2V, 13.6", 250deg). SB1 (Porb = 10.893d) [W.S.Fitch, ApJ 158, 269, 1969.]. P var. Max(Vr) = 2417359.715 + 0.1904795d*E (JD2415750 - 22000); Max(Vr) = 2422203.790 + 0.1904844d*E + 2.9440d*10**(-11)*E**2 + 3.2671d*10**(-17)*E**3 (JD2422000 - 42630) [O.Struve, D.H.McNamara, S.M.Kung, C.Beymer, ApJ 118, 39, 1953.]. Elements given in the Table satisfy observations in 1967 - 69.
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References
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1 Ricker, G. R.; et al., 2014, Transiting Exoplanet Survey Satellite (TESS) 2014SPIE.9143E..20R
2 Perryman, M. A. C.; et al., 1997, The HIPPARCOS and TYCHO catalogues 1997HIP...C......0E
3 D.F.Gray, AJ 75, 958, 1970. 1970AJ.....75..958G
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 = 3.64H = 3.75K = 3.90J - K = -0.26
AllWISE W1 = 3.56W2 = 2.69W3 = 3.93W4 = 3.88W1 - W2 = 0.86W3 - W4 = 0.05
Images
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Supporting Documents
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1 Phase plot Otero, Sebastian Alberto 2025-11-26 16:27 UTC Phase plot with TESS data.
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Revision History
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3 Otero, Sebastian Alberto 2025-11-26 16:27 UTC Period and epoch from TESS data. Range derived from Hipparcos, GCPD and TESS data.
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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