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  V0404 Cyg  
000-BCL-463 (81273 observations)  
Cygnus Sequence
20 24 03.82 +33 52 02.1  (306.01592 +33.86724) Search nearby
B1950.0 20 22 06.37 +33 42 16.2
Galactic coord. 73.119 -2.091
Other names

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AAVSO 2020+33 AN 100.1938 Downes V0404 Cyg
GS 2023+338    
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Variability type
Spectral type K0IV+Black hole
Mag. range
11.2 - 18.8 V
Discoverer A. A. Wachmann
14 Oct 1938 (HJD 2429186.00000) Ephemeris
Outburst 1938
Period 6.47083 d
Rise/eclipse dur. --
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1 Otero, Sebastian Alberto VSP Note: 18.9 Vmag. companion 1.4" to the North and 18.5 Vmag. star 7" to the South.
2 Otero, Sebastian Alberto Ellipsoidal variations at minimum V= 18.4 - 18.8; R= 16.5 - 16.9. Close companion (V= 18.9; R= 17.52) 1.4" away. (1993MNRAS.265..834C and 2004MNRAS.352..877Z). Position in the table is for the blend. Also the ~18.5 Vmag. star 2MASS J20240376+3351562 lies 7" away.
3 Admin, VSX 0.3 mag ellipsoidal variations during the orbital cycle with superimposed fast variability.
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Click reference title/citation to view in new window. Roll over index number to view submission details.
1 Corral-Santana, J. M.; Casares, J.; Muņoz-Darias, T.; et al., 2016,
WATCHDOG: A Comprehensive All-sky Database of Galactic Black Hole X-ray
2 R.A. Downes et al., 2001, PASP 113, 764 (2006 archival version) 2005JAD....11....2D
3 C. Zurita, J. Casares, R.I. Hynes, T. Shahbaz, P.A. Charles, E.P. Pavlenko,
2004, MNRAS 352, 877
4 R.A. Downes et al., 2001, PASP 113, 764 2001PASP..113..764D
5 Casares, J.; et al., 1993, Optical Studies of V:404-CYGNI the X-Ray
Transient GS:2023+338 - Part Three - the Secondary Star and Accretion Disc
6 A.A.Wachmann, Erg AN 11, N5, 1948. --
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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 = 13.57H = 12.68K = 12.32J - K = 1.25
Please review Digitized Sky Survey Acknowledgment and Copyright.
Size 5' x 5' (297 x 298 pixels)
Center 20 24 03.82 +33 52 02.1 (J2000)
Source STScI

Red, all sky, 1.0 arcsec/pixel
Supporting Documents
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 Legacy CVs
 BAA VSS Recurrent Objects Programme
Revision History
Currently approved revision is checked. Click revision number to view details of that revision.
7 Otero, Sebastian Alberto 2018-02-27 21:56 UTC Type and spectral type from 2016ApJS..222...15T. PPMXL position.
6 Otero, Sebastian Alberto 2015-06-24 19:32 UTC Maximum magnitude from AAVSO V data.
5 Otero, Sebastian Alberto 2013-10-01 04:58 UTC Minimum magnitude from 993MNRAS.265..834C and 2004MNRAS.352..877Z. Position from 2MASS.
4 Admin, VSX 2010-09-14 22:38 UTC Update from [2004MNRAS.352..877Z].
3 Admin, VSX 2010-01-04 23:43 UTC Position updated from the GCVS version of November 2009.
2 Admin, VSX 2007-03-23 15:52 UTC Discoverer added.
1 Admin, VSX 2005-12-17 20:33 UTC Initial database population.