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ASTRO: NGC 3938
NGC 3938 is probably my favourite galaxy, so I waited for a good night to
reshoot it. Unfortunately I had some focus drift during the exposure series, which didn't allow me to use the full potential of the very good seeing I had. I sharpened the image only slightly as there wasn't enough signal for any hard processing. Taken from the middle of Berlin with an 8" SCT at f/6.5, G11 mount, SXV-H9 camera, 38x5 minutes. The picture can also be found at http://ccd-astronomy.de/temp/3938-38x5gut.jpg Stefan |
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ASTRO: NGC 3938
Stefan Lilge wrote: NGC 3938 is probably my favourite galaxy, so I waited for a good night to reshoot it. Unfortunately I had some focus drift during the exposure series, which didn't allow me to use the full potential of the very good seeing I had. I sharpened the image only slightly as there wasn't enough signal for any hard processing. Taken from the middle of Berlin with an 8" SCT at f/6.5, G11 mount, SXV-H9 camera, 38x5 minutes. The picture can also be found at http://ccd-astronomy.de/temp/3938-38x5gut.jpg Stefan ------------------------------------------------------------------------ That's one that has been on my list but never got taken. My notes say it has lots of HII regions "Like beads on a string." Looks like I'll have trouble resolving those beads. They are 5" in size per my notes, look smaller in your shot. I doubt I'll get seeing any better than yours however. I can't begin to take a shot without refocusing every 5 or 10 minutes most nights. Temperature can drop rapidly. Ground is sand so it cools fast like in the desert but the water doesn't. That sets up my bad seeing as the two collide. I finally bit the bullet and bought a temperature compensating Robo focus unit. That has allowed me to go to 10 minute frames, longer and stars burn in too much. Now I only check the focus when going to another object. Usually it is right on though once in a while it will have moved off center. Still in focus just not centered in the narrow range of good focus. Many nights I never do alter it once set. Well worth the big bucks with this scope anyway. I'll have to wait for next year to try this guy as it's too far west for me. I have better seeing the farther east I look. To the west of the meridian I have a lot more water to look over and the house roof is warm if it was a sunny day adding to the seeing woes. If I get just the right night in the next week I might be able to catch it. So far nothing but clouds this new moon. 5 days and counting -- no rain of course, just clouds. Trees leaf out then die from lack of water. They say if we get rain in the next couple weeks they'll recover. But the birch and poplar appear to be in deep trouble just adding to the fire danger here. Never seen so many clouds with so little rain to show for it. Pine are going back to winter mode which means they won't dry out so much but they can't fight the pine bore. Usually their sap will drown them out but no sap in winter mode so the bore's do their damage. I can hear them in some of my trees chomping away from the start they got last year with so little rain. Looks like I'll have lots of firewood! 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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ASTRO: NGC 3938
Still enough detail for me Stefan.
I added this one to my wishlist.. reg Dirk "Stefan Lilge" wrote in message ... NGC 3938 is probably my favourite galaxy, so I waited for a good night to reshoot it. Unfortunately I had some focus drift during the exposure series, which didn't allow me to use the full potential of the very good seeing I had. I sharpened the image only slightly as there wasn't enough signal for any hard processing. Taken from the middle of Berlin with an 8" SCT at f/6.5, G11 mount, SXV-H9 camera, 38x5 minutes. The picture can also be found at http://ccd-astronomy.de/temp/3938-38x5gut.jpg Stefan |
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