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ASTRO: NGC7354
Small planetaries have been a problem for me. I just don't have the
seeing to show the fine detail others can image so I get a blob of light. NGC 7354 has been a failure of mine due to seeing. But a while ago seeing showed signs of calming. I took 2 hours of luminosity data using 2 minute exposures at 0.5". Only 9 of them were usable. Seeing never held for more than 2 minutes hence the short exposure time. I really need 20 minute frames as this scale to keep the noise down. By this time seeing was getting poor but I grabbed a couple minutes of 1.0" color data for each color. I planned on trying again but the weather never cooperated and it has moved into my "Polaris tree" for the rest of the season. I was surprised to find something could be salvaged from this very limited data. Color is weak but will have to do for this year. 14" LX200R @ f/10, L=9x2' RGB=2x2', STL-11000XM, Paramount ME Rick -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". |
#2
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ASTRO: NGC7354
Great shot Rick. This nebula looks a lot like NGC 6772 and 6804. It looks
like I haven't imaged this one. Stefan "Rick Johnson" schrieb im Newsbeitrag ster.com... Small planetaries have been a problem for me. I just don't have the seeing to show the fine detail others can image so I get a blob of light. NGC 7354 has been a failure of mine due to seeing. But a while ago seeing showed signs of calming. I took 2 hours of luminosity data using 2 minute exposures at 0.5". Only 9 of them were usable. Seeing never held for more than 2 minutes hence the short exposure time. I really need 20 minute frames as this scale to keep the noise down. By this time seeing was getting poor but I grabbed a couple minutes of 1.0" color data for each color. I planned on trying again but the weather never cooperated and it has moved into my "Polaris tree" for the rest of the season. I was surprised to find something could be salvaged from this very limited data. Color is weak but will have to do for this year. 14" LX200R @ f/10, L=9x2' RGB=2x2', STL-11000XM, Paramount ME Rick -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". |
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