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. -------------------------------------------------- SUBMIT OBSERVATIONS TO THE AAVSO Information on submitting observations to the AAVSO may be found at: http://www.aavso.org/observing/submit/ SPECIAL NOTICE ARCHIVE AND SUBSCRIPTION INFORMATION A Special Notice archive is available at the following URL: http://www.aavso.org/publications/specialnotice/ Subscribing and Unsubscribing may be done at the following URL: http://www.aavso.org/publications/email/