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[s.a.a] Finally some clear nights ! M27 in LHaRGB
All,
The Spring Monsoons lingered halfway through the summer this year and after literally 4 months without a clear night an all too brief period of clearing occurred so I grabbed the following image. Still not ideal as there was some thin haze but the seeing was quite good. M27 - LHaRGB image 5x600 sec (LRGB) 3x1800sec (Ha) Ha data combined with L and R before Color Combine. Tracking was excellent over the course of this but keeping up with the focus shift was still an issue. I think that the focus could have been improved but having been so long without a usable night I jumped the gun and started before the optics were at ambient. There was still some high thin haze that presented some challenges in processing. But the Moon wasn't a factor. http://www.celestial-images.com/Imag...0s-LHaRGB.html Regards Bill |
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Finally some clear nights ! M27 in LHaRGB
That's great-M27 is one object I cannot see. I guess the few
floodlights nearby contributes enough to overall skyglow-doesn't help me out one bit. I'll wait until the moon disappears and try again, couldn't see it last year no matter what. I guess it's time to get a filter...I'd read Laura Halliday's post where a Lumicon broadband filter did well for M27. While it might be hard to compare my skies to hers, she seemed to enjoy the results with that filter on a few objects: http://groups.google.com/group/sci.a...957e2653?hl=en Nice shot, Bill... Clear skies, Kerry |
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Finally some clear nights ! M27 in LHaRGB
ko57 wrote:
That's great-M27 is one object I cannot see. I guess the few floodlights nearby contributes enough to overall skyglow-doesn't help me out one bit. I'll wait until the moon disappears and try again, couldn't see it last year no matter what. I guess it's time to get a filter...I'd read Laura Halliday's post where a Lumicon broadband filter did well for M27. While it might be hard to compare my skies to hers, she seemed to enjoy the results with that filter on a few objects: http://groups.google.com/group/sci.a...957e2653?hl=en Nice shot, Bill... Hi Kerry, Thanks for the comments. M27 actually is quite bright and I think you should be able to see it. On top of the 10 inch Ritchey I have a FSQ106N mounted and it *is* visible in that. Not markedly so mind you. But I think this is one instance where a fast Refractor might be advantageous. My skies are terrible, maybe Mag 3.5 or 3.8 overhead and the Horizon is useless. so hopefully that gives you something to gauge your chances by. Usually planetary nebulae are better subjects due to their small size vs brightness. Best Regards Bill |
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Finally some clear nights ! M27 in LHaRGB
Hi Kerry,
Thanks for the comments. M27 actually is quite bright and I think you should be able to see it. On top of the 10 inch Ritchey I have a FSQ106N mounted and it *is* visible in that. Not markedly so mind you. But I think this is one instance where a fast Refractor might be advantageous. My skies are terrible, maybe Mag 3.5 or 3.8 overhead and the Horizon is useless. so hopefully that gives you something to gauge your chances by. Usually planetary nebulae are better subjects due to their small size vs brightness. Best Regards Bill My skies are right at 3.8-4, sometimes a bit darker, but still I just can't make it out. Even though the moon is up tonight I might still give it a try, but I'll definitely give it another go when the moon disappears again. I read somewhere that a black observing blanket helps for this, I have a black piece of material somewhere that I could use, might help. I'm going back & forth on filters, either a Lumicon Deep Sky or maybe an Orion Ultrablock or Lumicon UHC. Seems I read everywhere that the UHC is better, except for Laura's Deep sky recommendation, and as much as David Knisely recommends the UHC over all as far as nebulas, he did mention broadbands like the Deep Sky has it's merits for other things like galaxies. I had tried Astronomik's UHC, I didn't find it helped much, gave the sky an unnatural looking red/pink tint, I preferred the Orion Nebula (easy to see) without it. I can find M57 with no problem. Clear skies (and no monsoons for you Bill) Kerry |
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