[Utah-astronomy] LCROSS: Lunar surface brightness estimate near Cabeus A1

From a data slice from a ROLO lunar image,  I get a preliminary estimate of 3.8 mpsas +- 8% for the lunar surface surrounding Cabeus A1. Considering uncertainty in the max ejecta plume brightness at 4.0 mpsas, the estimate is not significantly different in brightness from the plume itself.  Presumably, the plume will be brighter than the Earth visible shadowed portion of Cabeus A1, just as the 3.8 mpsas surrounding surface is brighter than the shadowed portion of the crater.   My estimate is based on draft computations at: http://members.csolutions.net/fisherka/astronote/observed/LCROSS/20090927mps... http://tinyurl.com/y98x3rg    A review of the computations for any serious errors by the group would be appreciated.   Clear Skies - Kurt