More GRAIL info
More information about the upcoming GRAIL impacts is also available at
http://www.spaceflight101.com/grail-mission-updates.html
The impacts will occur at 22:29 UT, seperated by 20 seconds. The spacecraft are small, so nothing is expected to be visible, although the impact occurs in the dark. Because it’s waxing crescent, it will be daylight or twilight in most locations where the moon is above the horizon. LRO will image the site both before and after impact.
Thanks again to Mike Mattei for pointing out this web-site.