Brian, You might be able to estimate the duration of the visibility of the plume from this time-lapse animation done by the Canada France Hawaii Telescope. Looks like it's less than a minute. http://www.cfht.hawaii.edu/News/Smart1/ The ESA site states that the flash lasted less than a second, but provides no more information than that. And you're not alone in being unable to find any published photometry of the flash. I haven't read of any visual sightings of it -- only that one C8/Webcam image. Tom ---- "Workman wrote: > =20 > I was going to try to wwatch this, but the weather intervened - BIG > TIME! > > Anyway, I've seen various photos and descriptions, but nowhere can I > tell what magnitude, and what duration the impact flash was. Anybody > know? Just curious if I wouold have been able to see it through the > eyepiece. > -- > See message header for info on list archives or unsubscribing, and please > send personal replies to the author, not the list. > -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.