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 Comet C/2007 Q3 & M88
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tricks46
 Monday, November 23 2009 @ 10:07 am EST (Read 3160 times)  
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Hello. This comet discovered in 2007 has now become a morning object. One of the brightest comets in the sky, it is at 10th magnitude. Thought some might enjoy this.
Mike H.


 
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lrjarhead
 Monday, November 23 2009 @ 06:01 pm EST  
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Mike,
Great shot! I'm partial to comets with galaxy(s) in the backgroud (got your PIX of Tuttle w/M33 from Art Show).
Thanks,
Mike B.


 
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LME
 Tuesday, November 24 2009 @ 05:53 pm EST  
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Nice catch Mike! I see at least a dozen DSO's mingling around in there...

How are you able to capture the comet and the dim stuff without any trailing? If you used long exposures for the faint fuzzies to be visible, how come the comet hasn't trailed much if any? I tried imaging comet Lunlin, I think and I had a hard time keeping it on the chip for very long, it as moving so fast...


Clear Skies-Larry
 
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tricks46
 Wednesday, November 25 2009 @ 09:56 am EST  
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Quote by: LME

Nice catch Mike! I see at least a dozen DSO's mingling around in there...

How are you able to capture the comet and the dim stuff without any trailing? If you used long exposures for the faint fuzzies to be visible, how come the comet hasn't trailed much if any? I tried imaging comet Lunlin, I think and I had a hard time keeping it on the chip for very long, it as moving so fast...



There are different ways of working this out. First you must figure out the distance the comet moves in a certain time. Slower (distant) comets will allow longer exposures. This image has 10x100 second exposures with the lum filter and 2x45 seconds each through the RGB filters. Two stacking processes are then done. One on the comet false nuk. and then a stack on the stars. As the comet is not moving much and the fact the comet is moving in a friendly RA/DC movement the streaking of the comet is easly taken care of in programs like CcdSoft, PS and Neat Image. Other comets moving faster or in different directions require different exposures and image processing. Sounds pretty involved because it really is. There are also other stacking processes you can use which you take images of the area of sky where the comet will be for background and then add the comet exposures when the object arives later. Just takes comets and practice.
Mike


 
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