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Special Notice #169: Possible outburst of the dwarf nova BC UMa

AAVSO Special Notice #169

Possible outburst of the dwarf nova BC UMa
September 30, 2009

The high-amplitude, infrequently outbursting dwarf nova BC UMa has been reported in outburst.  The star was reported at a visual magnitude of 11.7 on JD 2455104.93958 (2009 Sep 30.4396) by T. Parson (Circle Pines, Minnesota, USA).  Confirming observations are requested at this time; upon positive confirmation, time-series observations are also requested.  The most recent preceeding observation submitted to the AAVSO was CV <15.4 made on JD 2455058.6361 (2009 August 15.1361; H. McGee, Guildford, England).  If BC UMa is in outburst it is not clear for how long.

BC UMa is located at the following (J2000) coordinates:

RA: 11:52:15.90 , Dec: +49:14:42.0

Charts for BC UMa may be plotted with AAVSO Variable Star Plotter: http://www.aavso.org/observing/charts/vsp/index.html?pickname=BC%20UMa

Please promptly submit all observations to the AAVSO with the name "BC UMa".

This AAVSO Special Notice was prepared by M. Templeton.
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