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  V2010 Cyg  
000-BDP-746 (4 observations)  
Cygnus Sequence
20 09 43.75 +31 59 08.7  (302.43229 +31.98575) Search nearby
B1950.0 20 07 45.24 +31 50 14.8
Galactic coord. 69.876 -0.650
Other names

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2MASS J20094374+3159086 LD 162 Mis V1340
NSVS 8467488 NSVS 8484079 NSVS J2009441+315858
SDSS J200943.75+315908.6 UCAC4 610-102364  
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Variability type
Spectral type --
Mag. range
14.6 - <17.4 V
Discoverer --
14 May 1987 (HJD 2446930) Ephemeris
Outburst --
Period 430 d
Rise/eclipse dur. --
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1 Otero, Sebastian Alberto VSP Note: 16.5 mag. red companion (variable?) 20" to the South.
2 Otero, Sebastian Alberto J-K= 2.58:; B-V= 4.2 (SDSS). Magnitudes from Dahlmark corrected using formula in IBVS 3855 and B-V~4. The finding chart in IBVS 3855 points to the Southern component of a 20" binary but both the Dauban and the Misao survey detect the Northern component as strongly variable. Combination of data from NSVS, Misao and Dahlmark reveals that they are one and the same mira so Dahlmark's identification is wrong. The other star is 2MASS J20094414+3158496 (J= 7.90; J-K= 1.95) and has V= 16.5 (UCAC4), V= 16.5 (CMC14) and V= 16.4; B-V= 3.2 (SDSS). Because of its colors, period and bump in the ascending branch, this is probably a carbon mira.
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1 S. Yoshida, 2012, MISAO project (online data) --
2 P.R. Wozniak, S.J. Williams, W.T. Vestrand, V. Gupta, AJ 128, 2965, 2004 2004AJ....128.2965W
3 L.Dahlmark, IBVS N3855, 1993. 1993IBVS.3855....1D
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Catalog Data
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2MASS J = 6.58H = 4.87K = 3.99J - K = 2.58
SDSS-DR12 u = 17.36g = 17.70r = 13.67i = 15.18z = 12.89u - g = -0.34r - i = -1.51
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Supporting Documents
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1 Phase plot Otero, Sebastian Alberto 2013-09-15 07:02 UTC Phase plot with NSVS, Dahlmark and Misao data.
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Revision History
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3 Otero, Sebastian Alberto 2013-09-15 07:02 UTC Period, epoch and range from Dahlmark, NSVS and Misao data. Identification based on Dauban Survey and Misao survey observations combined with Dahlmark's. 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.