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COMET ISON Bruce Gary Latest Update: Possible Recovery Image

#Observations_by_Date_This may be an artifact of some sort that we don't understand, so the blob A location and the predicted location if it's following the comet track need to be observed carefully, as soon as possible. If it's clear tomorrow we'll know if this is a "recovery."One person suggested that there may be a dust cloud of particles larger than typical tail particles and a group of clumps or fragments of larger size. The dust cloud would be affected by solar light pressure and move away from the sun, while the grup of fragments would continue on an orbit unaffected by either light pressure or solar wind. However, the group of fragments could be on an orbit that was altered when the comet nucleus broke-up hours before perihelion (due to jets and break-up dynamics), so they could be on a trajectory that is slightly different from what was predicted before perihelion passage. A bunch of fragments might be very, very faint because they're no longer outgassing, whereas the dust cloud could be visible because of reflected sunlight. HST is planning observations Dec 18, and they are trying to figure out where to point; I think they want to aim at the fragment group as a primary goal. We amateurs should concentrate on imaging the dust cloud because that's probably the only thing that is bright enough to a comet!Bruce Gary

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