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  V1668 Cyg  
000-BCP-208 (7727 observations)  
Cygnus Sequence
21 42 35.34 +44 01 54.6  (325.64725 +44.03183) Search nearby
B1950.0 21 40 38.15 +43 48 09.6
Galactic coord. 90.838 -6.760
Other names

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AAVSO 2138+43B Downes V1668 Cyg  
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Variability type
Spectral type pec(NOVA)
Mag. range
6 - 20.0: V
Discoverer W. Morrison/P. L. Collins
12 Sep 1978 (HJD 2443764.0000) Ephemeris
Outburst 1978
Period 0.1384 d  (3.32 h)
Rise/eclipse dur. --
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1 GCVS Team There are sinusoidal light variations with A(V) = 0.15m and elements Min = 2443767.475 + 0.4392d*E in the descending branch of the light curve after JD2443765 [F.Campolonghi, R.Gilmozzi, U.Guidoni, R.Messi, G.Natali, J.Wells, AsAp 85, L4, 1980.]. Infrared light curves (1.6 - 10 mkm) have a secondary maximum (JD2443815) due to the formation of the dust envelope. At 10 mkm this secondary maximum is brighter than the primary one [R.D.Gehrz, J.A.Hackwell, G.L. Grasdalen, E.P.Ney, G.Neugerauer, K.Sellgren, ApJ 239, N2, 570, 1980.].
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1 R.A. Downes et al., 2001, PASP 113, 764 (2006 archival version) 2005JAD....11....2D
2 R.A. Downes et al., 2001, PASP 113, 764 2001PASP..113..764D
3 A.Paolantonio, R.Patriarca, P.Tempesti, IBVS N1913, 1981. 1981IBVS.1913....1D
4 H.W.Duerbeck, H.Pollok, IBVS N1845, 1980. 1980IBVS.1845....1D
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Revision History
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4 Admin, VSX 2010-01-04 23:43 UTC Position updated from the GCVS version of November 2009.
3 Admin, VSX 2009-09-22 20:52 UTC Added orbital period from Downes et al. [2001PASP..113..764D].
2 Admin, VSX 2007-03-23 15:52 UTC Discoverer added.
1 Admin, VSX 2005-12-17 20:33 UTC Initial database population.