Summer vacation ideas for However, in light of the comet’s failure to brighten as expected over the following months, peak magnitude forecasts were downgraded to Tragically, ISON did not attain even to that brightness level or put on any kind of notable display; in fact, half an hour before perihelion, exposed to the full force of the Sun’s powerful gravity and heat, the comet completely disintegrated. However, sometimes comets end up brighter than simple predictions based on their intrinsic brightness might suggest. Comets, particularly but not only those new to our part of the solar system, may on occasion undergo sudden bursts of brightness that increase their brightness by between and times ? magnitudes or even , times magnitudes for ? weeks or more. The comet most famous for its outbursts is Comet Holmes fig. Within hours in October it grew incredibly and went from being magnitude +, a thousand times too faint even to be seen with binoculars, to magnitude +., which was almost enough to make it one of the top brightest stars in the sky. That is a half-a-million-fold intensiication of brightness. Summer vacation ideas 2016.