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  V2331 Cyg  
000-BDQ-016 (837 observations)  
Cygnus Sequence
21 11 13.60 +34 19 14.3  (317.80667 +34.32064) Search nearby
B1950.0 21 09 10.58 +34 06 54.9
Proper motion
RA: -8.2 +/- 2.5 mas/yDec: -2.1 +/- 3.0 mas/ySource: UCAC4
Galactic coord. 79.597 -9.436
Other names

(Internal only)
2MASS J21111360+3419142 LD 391 USNO-B1.0 1243-0462412
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Variability type
Spectral type --
Mag. range
13.4 - 15.9 V
Discoverer L. Dahlmark
13 Sep 2012 (HJD 2456184.296) Ephemeris
Outburst --
Period 1.388613 d
Rise/eclipse dur. 14%  (4.67 h)
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1 Holmberg, Gustav This variable was discovered by Dahlmark, who classified it as type L. During monitoring in the autumn of 2012, the Swedish variable star group SAAF/V found deep eclipses and determined the elements of this eclipsing variable. Amplitude of secondary minimum: about 0.1 mag (V).
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1 Bengtsson, H.; et al., 2013, V2331 Cygni is an Algol Variable With Deep
2 L. Dahlmark, IBVS N5181, 2001. 2001IBVS.5181....1D
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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 = 12.50H = 12.26K = 12.17J - K = 0.34
AllWISE W1 = 12.24W2 = 12.30W3 = 12.14W1 - W2 = -0.06
APASS-DR9 B = 13.55V = 13.45g' = 13.20r' = 13.45i' = 13.41B - V = 0.11
Please review Digitized Sky Survey Acknowledgment and Copyright.
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Supporting Documents
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2 Phase plot V-data 2012-2015. Karlsson, Thomas 2015-09-01 14:18 UTC From observations done by SAAF (Association of Swedish Amateur Astronomers)
1 Phase plot Holmberg, Gustav 2012-10-30 11:04 UTC Phase plot, V data.
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Revision History
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5 Karlsson, Thomas 2015-08-30 10:52 UTC Updated period and added eclipse duration, based on observations 2012-2015
4 Karlsson, Thomas 2015-07-27 10:30 UTC Added reference.
3 Holmberg, Gustav 2012-10-07 10:36 UTC Type, period, epoch and range revised. Note about the discovery of eclipses added. UCAC4 position.
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.