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ASTRO: UGC 1810 and UGC 1813 (Arp 273)
UGC 1810 and UGC 1813 is a pair of galaxies in Andromeda that is also listed
as Arp273. I used the current model Meade f/6.3 reducer here, which gave a focal ratio of f/5.1 with the large distance between reducer and camera I used. My old Celestron f/6.3 reducer (still "made in Japan") gives f/5.7 at this setting, it also has much less vignetting and better starshapes near the edge (had to crop this image because of bad stars). Taken from the middle of Berlin with a 10" Meade ARC at f/5.1, SXV-H9 camera, 34x5 minutes. The picture can also be found at http://ccd-astronomy.de/temp2/UGC1810-34x5gut.jpg Stefan |
#2
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ASTRO: UGC 1810 and UGC 1813 (Arp 273)
Stefan Lilge wrote: UGC 1810 and UGC 1813 is a pair of galaxies in Andromeda that is also listed as Arp273. I used the current model Meade f/6.3 reducer here, which gave a focal ratio of f/5.1 with the large distance between reducer and camera I used. My old Celestron f/6.3 reducer (still "made in Japan") gives f/5.7 at this setting, it also has much less vignetting and better starshapes near the edge (had to crop this image because of bad stars). Taken from the middle of Berlin with a 10" Meade ARC at f/5.1, SXV-H9 camera, 34x5 minutes. The picture can also be found at http://ccd-astronomy.de/temp2/UGC1810-34x5gut.jpg Stefan Hey, I was just about to post an image of this pair. You beat me to it! You keep surprising me with what you can image from inside Berlin. This was a difficult target (and processing challenge) from my dark skies. No way I could have done it from your location. 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". |
#3
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ASTRO: UGC 1810 and UGC 1813 (Arp 273)
A SCT working @ f/5.1! I am thinking about trading my C-11 for a 10" ARC.
I would like a 12" but the G-11 might whine a little with the extra weight. Nice image BTW. I like the star sizes. Joe Joe "Stefan Lilge" wrote in message ... UGC 1810 and UGC 1813 is a pair of galaxies in Andromeda that is also listed as Arp273. I used the current model Meade f/6.3 reducer here, which gave a focal ratio of f/5.1 with the large distance between reducer and camera I used. My old Celestron f/6.3 reducer (still "made in Japan") gives f/5.7 at this setting, it also has much less vignetting and better starshapes near the edge (had to crop this image because of bad stars). Taken from the middle of Berlin with a 10" Meade ARC at f/5.1, SXV-H9 camera, 34x5 minutes. The picture can also be found at http://ccd-astronomy.de/temp2/UGC1810-34x5gut.jpg Stefan |
#4
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ASTRO: UGC 1810 and UGC 1813 (Arp 273)
Thanks Joe.
The f/5.1 setting produced "strange" starshapes near the edge of the field which I cropped out. With my old Celestron reducer I get good stars over the FOV of my (rather small) chip at f/5.7. I agree that 12" would be a challenge for the G11 unless you have an observatory where the scope is shielded from wind. In windy nights I have to take off the dewshield of my 10" to give the wind a smaller target. Stefan "J McBride" schrieb im Newsbeitrag y... A SCT working @ f/5.1! I am thinking about trading my C-11 for a 10" ARC. I would like a 12" but the G-11 might whine a little with the extra weight. Nice image BTW. I like the star sizes. Joe Joe "Stefan Lilge" wrote in message ... UGC 1810 and UGC 1813 is a pair of galaxies in Andromeda that is also listed as Arp273. I used the current model Meade f/6.3 reducer here, which gave a focal ratio of f/5.1 with the large distance between reducer and camera I used. My old Celestron f/6.3 reducer (still "made in Japan") gives f/5.7 at this setting, it also has much less vignetting and better starshapes near the edge (had to crop this image because of bad stars). Taken from the middle of Berlin with a 10" Meade ARC at f/5.1, SXV-H9 camera, 34x5 minutes. The picture can also be found at http://ccd-astronomy.de/temp2/UGC1810-34x5gut.jpg Stefan |
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