AAVSO Alert Notice 480
MR UMa superoutburst coverage requested for HST observations
March 8, 2013
MR UMa superoutburst coverage requested for HST observations
March 8, 2013
Dr. Boris Gaensicke (Warwick University) has requested observations of the currently-outbursting SU UMa-type cataclysmic variable MR UMa in preparation for and support of HST observations scheduled for the week 2013 April 4-7.
Dr. Gaensicke says that, since MR UMa appears to be in superoutburst, the HST observations scheduled for next month “might offer an unplanned opportunity to measure the post-outburst cooling of the WD in this system.” Observations in the AAVSO International Database show MR UMa at magnitude 13.662 V on 2013 March 8.35944 UT (JD 2456359.85944, J. Roe, Bourbon, MO), down from 13.3 visual on March 2.841 (2456354.341, P. Dubovsky, Kolonica, Slovakia). The outburst may have begun earlier – MR UMa is around 13 V at maximum, and the most recent observation prior to the one on March 2 was 9 days earlier (February 21.41667, 2456344.91667, C. Chiselbrook, Marietta, GA) and showed MR UMa at <13.9 visual. The previous outburst, also a superoutburst, occurred in June 2012. Nightly observations are requested now through April 10. As the HST observations draw closer, the cadence of observations may be revised. For obtaining magnitudes, V observations are preferred; visual observations are also welcome. Coordinates: R.A. 11 31 22.39 Dec. +43 22 38.4 (2000.0)
Charts for MR UMa made be created using the AAVSO Variable Star Plotter.
Please submit observations to the AAVSO International Database as MR UMA.
This AAVSO Alert Notice was compiled by Elizabeth O. Waagen.
Please use the following links:
Submit Observations: http://www.aavso.org/webobs
Alert Notice archive: http://www.aavso.org/alert-notice-archive
Subscription information: http://www.aavso.org/observation-notification#alertnotice
Filed under: AAVSO Alerts
