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what exactly is the criteria for a 'Great' comet? if what we observed this morning isnt a Great comet, i'm not sure what is!? Comet Lovejoy's tail was as bright as the southern milky way, actually much brighter as it rose, so what that puts it in the 3.5 mag surface brightness range, min, especially the brighter section of tail! i was comparing it to pointers and other bright stars, very comparible! we could easy see 25d naked eye tail by full visiblity .. in bright twilight, not much else left visible at comets altitude hmmm
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