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#11
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alignment (was: ASTRO: Leo III (Leo A))
"Rick Johnson" wrote ....... Oddly, now that it is 50F degrees warmer the scope has come back into close collimation. Must be a cold issue in the design. I expect it to be back to normal in another 10 degrees so haven't touched it. Come summer I may have to adjust the other way! Rick, I'm not surprised. The big shifts in temp we have 'up north' have big impacts of telescopes in general, including the mounts. It also impacts gear error as they shrink with the cold. At Kopernik, since it's not my $140 grand telescope, I'm somewhat reluctant to use the scope at a temp below about 10F degrees because of possible damage to the gears and bearings in the mount, not to mention the protest sounds that come from the dome when rotating. George N |
#12
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ASTRO: Leo III (Leo A)
"Rick Johnson" wrote ... ....... Leo III has a population of very young stars which is odd for a dwarf with so little dust and gas. It seems to have had several periods of star birth over its lifetime. Rick, Great image! Your seeing must have been OK the night you took this one. I would bet that those red 'stars' in your image are actually small H-II regions. Otherwise, this galaxy is a neat collection of mostly blue giants! My guess is that these dwarfs are the remnants of a larger spiral that was cannibalized by the Milky Way. George N |
#13
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alignment
George Normandin wrote: "Rick Johnson" wrote ....... Oddly, now that it is 50F degrees warmer the scope has come back into close collimation. Must be a cold issue in the design. I expect it to be back to normal in another 10 degrees so haven't touched it. Come summer I may have to adjust the other way! Rick, I'm not surprised. The big shifts in temp we have 'up north' have big impacts of telescopes in general, including the mounts. It also impacts gear error as they shrink with the cold. At Kopernik, since it's not my $140 grand telescope, I'm somewhat reluctant to use the scope at a temp below about 10F degrees because of possible damage to the gears and bearings in the mount, not to mention the protest sounds that come from the dome when rotating. George N While possibly true of Leo I and II this guy is at about the same distance as M31 but in the opposite direction so I doubt he's had much if any cannibalism. From what I can read on this guy it's had several rounds of star formation, the last not all that long ago, hence the blue "stars". I'm not sure if those are individual stars or more likely massive clusters of blue stars. The last major round of star formation was too long ago for the O and B stars to still be around. Late A might have a chance to still be there but you'd need a cluster of them to show as bright as the knots do at that distance. 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". |
#14
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ASTRO: Leo III (Leo A)
Rick,
amazing shot. I'll have to find out where this galaxy is, though I would guess that it is not suitable for city skies... Stefan "Rick Johnson" schrieb im Newsbeitrag ... After Leo I and Leo II comes Leo III. Why Leo II is also known as Leo B but Leo III is Leo A I can't fathom. Leo III has a population of very young stars which is odd for a dwarf with so little dust and gas. It seems to have had several periods of star birth over its lifetime. Leo I is a over 800 thousand light years away and Leo II 750 thousand light years. They are satellites of our galaxy. Leo III however is 2.5 million light years away so a member of our local group but not a satellite galaxy. Still, thanks to those young massive stars I was able to resolve quite a few of its stars. I tried something new when imaging this guy. I used 3x3 binning on the color frames. Otherwise, through the filters I'd have needed a lot of exposure time to capture the color of the faint stars. This allowed me to use half the exposure time and still resolve the stars through the filters. It turned out well so I may do this more often and save some imaging time. 14" LX200R@f/10, L=4x10' binned 2x2, RGB=2x10' binned 3x3, 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". |
#15
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ASTRO: Leo III (Leo A)
09h 59m 26s +30d 44m 47s is where my FITS header says the scope was
pointed. That's usually within a second or two of the catalog position. Rick Stefan Lilge wrote: Rick, amazing shot. I'll have to find out where this galaxy is, though I would guess that it is not suitable for city skies... Stefan "Rick Johnson" schrieb im Newsbeitrag ... After Leo I and Leo II comes Leo III. Why Leo II is also known as Leo B but Leo III is Leo A I can't fathom. Leo III has a population of very young stars which is odd for a dwarf with so little dust and gas. It seems to have had several periods of star birth over its lifetime. Leo I is a over 800 thousand light years away and Leo II 750 thousand light years. They are satellites of our galaxy. Leo III however is 2.5 million light years away so a member of our local group but not a satellite galaxy. Still, thanks to those young massive stars I was able to resolve quite a few of its stars. I tried something new when imaging this guy. I used 3x3 binning on the color frames. Otherwise, through the filters I'd have needed a lot of exposure time to capture the color of the faint stars. This allowed me to use half the exposure time and still resolve the stars through the filters. It turned out well so I may do this more often and save some imaging time. 14" LX200R@f/10, L=4x10' binned 2x2, RGB=2x10' binned 3x3, 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". -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". |
#16
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ASTRO: Leo III (Leo A)
"Martin C Germano" wrote in message ink.net... Hi Scott, and all .... WOW! That's a dwarf galaxy if I ever saw one. I bet Marty Germano would love to see this image! I see and am amazed! It's really wonderful what ccd's can do. Rick's image actually resolves the *stars* in Leo III ... way better than my 14.5" Newt and Tech Pan. -- Marty Hi Marty! Hope all is well for you and family. Haven't seen you posting much since you went over to the dark side :^). Scott |
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