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Latest Details
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Name
  KU Cyg  
AAVSO UID
000-BCK-946 (325 observations)  
Constellation
Cygnus Sequence
J2000.0
20 12 45.11 +47 23 41.4  (303.18796 +47.39483) Search nearby
B1950.0 20 11 12.16 +47 14 35.7
Proper motion
RA: 0.219 +/- 0.167 mas/yDec: -1.272 +/- 0.155 mas/ySource: Gaia DR1
Galactic coord. 83.147 +7.257
Other names

(Internal only)
AN 436.1928 HIP 99599 IOMC 3563000051
SVS 877    
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Variability type
EA/GS
Spectral type B7:V+K5IIIe
Mag. range
10.73 - 12.38 V
Discoverer --
Epoch
10 Sep 2002 (HJD 2452528.1) Ephemeris
Outburst --
Period 38.4396 d
Rise/eclipse dur. 8%  (3.08 d)
Remarks
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1 Otero, Sebastian Alberto Total eclipses. Out of eclipse variations come from luminosity changes in an eccentric accretion disk.
2 GCVS Team Min II 11.15; d = 0.047P. Shape of the light curve varies.
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References
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1 Bob Nelson's O-C files, 2016 --
2 J. Alfonso-Garzon, A. Domingo, J.M. Mas-Hesse, A. Gimenez, 2012,
arXiv:1210.0821 [astro-ph.IM] (online info)
2012arXiv1210.0821A
3 J.M. Kreiner, 2004, Acta Astronomica, vol. 54, pp 207-210 2004AcA....54..207K
4 KU CYG and its Eccentric Accretion Disk 1997AcA....47..345S
5 KU Cygni: New Spectroscopic and Photometric Solutions of a Long-Period
Accretion-Disk Binary
1995AJ....110.2378O
6 The Algol-type binary with an accretion disk 1992AcA....42..355Z
7 KU Cygni and its thick, dusty accretion disk 1988AJ.....96.1439O
8 D.M.Popper, ApJ 139, 143, 1964. 1964ApJ...139..143P
9 M.Huruhata, S.Gaposchkin, HB N914, 1940. 1940BHarO.914...11H
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 = 8.94H = 8.23K = 7.99J - K = 0.95
AllWISE W1 = 7.82W2 = 7.89W3 = 7.73W4 = 7.22W1 - W2 = -0.07W3 - W4 = 0.51
APASS-DR9 B = 11.33V = 10.91g' = 11.11r' = 10.64i' = 10.31B - V = 0.42
Images
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Supporting Documents
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Revision History
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4 Otero, Sebastian Alberto 2011-10-22 21:03 UTC Variability and spectral type from 1997AcA....47..345S
3 McCann, James R. 2010-05-23 05:16 UTC Updating period and epoch from very old values. Popper 1964ApJ...139..143P gives 2433884.84 + 38.4393E. Updating to HJD = 2452528.1 + E x 38.4396 per J.M. Kreiner, 2004, Acta Astronomica, vol. 54, pp 207-210 see http://www.as.wsp.krakow.pl/minicalc/CYGKU.HTM
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.