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Details for Revision 4
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Name
  V2331 Cyg  
AAVSO UID
000-BDQ-016 (953 observations)  
Constellation
Cygnus Sequence
J2000.0
21 11 13.60 +34 19 14.3  (317.80667 +34.32064) Search nearby
B1950.0 21 09 10.54 +34 06 54.8
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
EA
Spectral type --
Mag. range
13.4 - 15.9 V
Discoverer L. Dahlmark
Epoch
13 Sep 2012 (HJD 2456184.296) Ephemeris
Outburst --
Period 1.3885 d
Rise/eclipse dur. --
Remarks
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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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References
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1 Bengtsson, H.; et al., 2013, V2331 Cygni is an Algol Variable With Deep
Eclipses 		2013JAVSO..41..264B
2 Bengtsson, H.; et al., 2013, V2331 Cygni is an Algol Variable With Deep
Eclipses 		2013JAVSO..41..264B
3 L. Dahlmark, IBVS N5181, 2001. 2001IBVS.5181....1D
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Supporting Documents
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2 Phase plot V-data 2012-2015. Karlsson, Thomas 2015-09-01 18:18 UTC From observations done by SAAF (Association of Swedish Amateur Astronomers)
1 Phase plot Holmberg, Gustav 2012-10-30 15:04 UTC Phase plot, V data.
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Revision History
Currently approved revision is checked. Click revision number to view details of that revision.
5 Karlsson, Thomas 2015-08-30 14:52 UTC Updated period and added eclipse duration, based on observations 2012-2015
4 Karlsson, Thomas 2015-07-27 14:30 UTC Added reference.
3 Holmberg, Gustav 2012-10-07 14:36 UTC Type, period, epoch and range revised. Note about the discovery of eclipses added. UCAC4 position.
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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