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  1. Anyone planning to image comet 252p/linear this week? Comet 252p/linear will pass close to Earth beginning this weekend (closest distance on Monday). It is passing close to the Large Magellanic Cloud and I understand that it will only be visible from the Southern hemisphere until the end of the month when it will begin to be visible from the north as well. Is anyone planning on trying to capture images as it gets close? For me, here in the Blue Mountains above Sydney, the forecast is not good; cloudy every night except Friday 18th ( 3 days before closest approach ). I’m going to try to see if I can capture anything useable on Friday. Does anyone have any advice about settings to use? From my estimates/calculations, during Friday night, the comet will be travelling with an apparent angular velocity of about 0.3” / sec. With my setup that’s equivalent to about 1 pixel every 2.5 seconds. So if I track on a star I will need to use a ‘very short’ exposure if I’m going to freeze the comet’s motion ( I’m thinking of trying ISO 3200 @ 2s and increasing this until the blur is too noticeable ). I suppose I could try and track on the comet itself but I’m not sure that it will be bright enough; I have come across various predictions in the mag 5 to mag 7 range and again I would need a fairly short integration time in PHD if I want to freeze the motion of the ‘guide star’. Of course, this won’t help with the background stars so I would still need a short exposure if I’m going to freeze both the comet and the stars. Any ideas, thoughts? Sorry for the rambling post, it reflects a fairly fuzzy post lunch mind
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