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Name
  S Equ  
AAVSO UID
000-BCV-883 (2335 observations)  
Constellation
Equuleus Sequence
J2000.0
20 57 12.84 +05 04 49.4  (314.30350 +5.08039) Search nearby
B1950.0 20 54 43.25 +04 53 13.4
Proper motion
RA: 16.083 +/- 0.065 mas/yDec: -2.869 +/- 0.038 mas/ySource: Gaia DR1
Galactic coord. 53.315 -24.966
Other names

(Internal only)
Please note that aliases shown in grey link to obsolete records.
AAVSO 2052+04 AN 56.1916 ASAS J205713+0504.8
BD+04 4584 HD 199454 HIP 103419
HV 3412 SAO 126399  
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Variability type
EA/SD
Spectral type B9V+F9III-IV
Mag. range
8.35 - 10.40 V
Discoverer --
Epoch
25 Jun 1966 (HJD 2439301.538) Ephemeris
Outburst --
Period 3.436106 d
Rise/eclipse dur. 13%
Remarks
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1 Wunder, Edgar Min II: V= 8.46.
2 GCVS Team Min II 8.11. P var. Before JD2427000 Min = 2423746.490 + 3.4360050d*E [V.P.Zessewitsch, Astron. Tsirk. N164, 1955.]; Min = 2437968.345 + 3.436072d*E (JD2427000 - 41000) [M.Plavec, BAC 15, 23, 1964.]; since JD2441000 - see Table. Gaseous streams; in Min light Halpha is in emission.
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References
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1 Paschke, A., 2014, OEJV #162 2014OEJV..162....1P
2 G.Pojmanski, Acta Astronomica 52, 397, 2002. 2002AcA....52..397P
3 S. Zola, Acta Astronomica 42, 93, 1992. 1992AcA....42...93Z
4 A.D.Mallama, ApJ Suppl 44, 241, 1980. 1980ApJS...44..241M
5 H.Tashpulatov, Perem. Zvezdy 17, N1, 76, 1969. 1969PZ.....17...76T
6 Bob Nelson's O-C files, 2016 --
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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 = 8.30H = 8.24K = 8.25J - K = 0.05
AllWISE W1 = 7.89W2 = 7.92W3 = 7.76W4 = 7.63W1 - W2 = -0.03W3 - W4 = 0.13
APASS-DR9
SDSS-DR12 u = 12.52g = 11.57r = 10.73i = 10.37z = 9.09u - g = 0.95r - i = 0.37
Images
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Supporting Documents
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Revision History
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5 Otero, Sebastian Alberto 2016-03-23 19:31 UTC Update from [2014OEJV..162....1P].
4 Otero, Sebastian Alberto 2013-04-17 16:47 UTC Epoch from ASAS-3 data.
3 Wunder, Edgar 2013-04-12 20:09 UTC magnitude range from Zola (1992), ASAS3 and Hipparcos data.
2 Admin, VSX 2010-01-04 23:43 UTC Position updated from the GCVS version of November 2009.
1 Admin, VSX 2005-12-17 20:33 UTC Initial upload.