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Latest Details
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Name
  V2011 Cyg  
AAVSO UID
000-BCK-930 (7 observations)  
Constellation
Cygnus Sequence
J2000.0
20 12 33.12 +40 16 05.4  (303.13800 +40.26817) Search nearby
B1950.0 20 10 46.82 +40 07 00.9
Proper motion
RA: -7.402 +/- 0.028 mas/yDec: -2.377 +/- 0.032 mas/ySource: Gaia DR1
Galactic coord. 77.125 +3.404
Other names

(Internal only)
Please note that aliases shown in grey link to obsolete records.
BD+39 4082 HD 192281 HIP 99580
NSV 12907 SAO 49319  
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Variability type
VAR:
Spectral type O4.5IV(n)(f)
Mag. range
7.52 - 7.56 V
Discoverer --
Epoch
--
Outburst --
Period --
Rise/eclipse dur. --
Remarks
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1 Otero, Sebastian Alberto The period of 9.59 d. (HJDmax 2448193.29) in 1993AstL...19..420B is not seen in contemporaneous HIPPARCOS data (see plot). The comparison star used by the author (HD 192660 = HIP 99760) is variable so results are inconclusive.
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References
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1 Maíz Apellániz, J.; Sota, A.; Arias, J. I.; et al., 2016, The Galactic
O-Star Spectroscopic Survey (GOSSS). III. 142 Additional O-type Systems.
2016ApJS..224....4M
2 Perryman, M. A. C.; et al., 1997, The HIPPARCOS and TYCHO catalogues 1997HIP...C......0E
3 A.A.Barannikov, Astronomy Letters 19, No.6, 420, 1993 = Astr Zh Pisma
(Russia) 19, No.11, 1032, 1993.
1993AstL...19..420B
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 = 6.74H = 6.72K = 6.70J - K = 0.05
AllWISE W1 = 6.66W2 = 6.63W3 = 6.63W4 = 5.83W1 - W2 = 0.03W3 - W4 = 0.80
APASS-DR9 B = 8.05V = 7.53g' = 7.79r' = 7.51i' = 7.36B - V = 0.52
Images
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Supporting Documents
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1 Phase plot Otero, Sebastian Alberto 2015-11-13 05:24 UTC Phase plot with HIPPARCOS and Barannikov data.
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Revision History
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4 Otero, Sebastian Alberto 2018-07-10 07:55 UTC Spectral type from 2016ApJS..224....4M.
3 Otero, Sebastian Alberto 2015-11-13 05:24 UTC Type and range from HIPPARCOS and 1993AstL...19..420B data. Spectral type from 1993AstL...19..420B.
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.