AAVSO Special Notice #128: Rare outburst of the dwarf nova V1251 Cyg

As reported by Hubert Hautecler and Eddy Muyllaert (baavss-alert #1835,
cvnet-alert #2691) the rarely-outbursting dwarf nova V1251 Cyg is currently
in outburst.  The last reported outburst was in 1997.  Reported magnitudes
for the current outburst are: JD 2454756.498 (2008 Oct 16.998 UT), 
m(vis) < 16.1 (G. Poyner); JD 2454758.2944 (2008 Oct 18.7944 UT), 
m(vis) < 14.6 (E. Muyllaert); JD 2454759.3340 (2008 Oct 19.834 UT), 
m(vis) = 12.4 (H. Hautecler); JD 2454759.3646 (2008 Oct 19.8646),
m(vis) = 12.5 (E. Muyllaert).  

All observations, both visual estimates and instrumental photometry, are 
urgently requested.  For instrumental observers, please observe so that
you obtain S/N of at least 50.  Filtered and unfiltered observations are
acceptable -- filtered are preferred if you can obtain good S/N in
reasonable time.  

V1251 Cyg is located at RA: 21 40 54.40 , Dec: +48 39 43.0 (J2000)

Charts for V1251 Cyg may be plotted using VSP:

http://www.aavso.org/observing/charts/vsp/index.html?pickname=V1251%20Cyg

Please report all observations to the AAVSO as "V1251 CYG".

This AAVSO Special Notice was prepared by M. Templeton

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