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ASTRO: Flame Nebula NGC 1977
This shot gives a whole new meaning to reflection "nebula"!
With a big bright moon nearby I decided to try the H-alpha filter on the Flame. I quickly discovered I hate Alnitak (Zeta Orionis). No matter what I did it put nasty reflections in the image. Put it out of the field and they were really bad unless it was so far out so was much of the nebula. Put it in the field and they wiped out most of the western half. I finally found if I cut off the "top" of the nebula I could minimize the damage. I even waited until it was west of the meridian and thus the camera upside down to see if that helped. Not much if any -- it was still pretty bad. This was the best I could do. I have no idea what is causing the overlarge donut reflections. Even a slight movement of the FOV caused them to multiply and brighten greatly. 14" LX200R@F/10, 2x30 minutes H-alpha binned 2x2, STL-11000M, 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: Flame Nebula NGC 1977
Rick Johnson wrote: This shot gives a whole new meaning to reflection "nebula"! With a big bright moon nearby I decided to try the H-alpha filter on the Flame. I quickly discovered I hate Alnitak (Zeta Orionis). No matter what I did it put nasty reflections in the image. Put it out of the field and they were really bad unless it was so far out so was much of the nebula. Put it in the field and they wiped out most of the western half. I finally found if I cut off the "top" of the nebula I could minimize the damage. I even waited until it was west of the meridian and thus the camera upside down to see if that helped. Not much if any -- it was still pretty bad. This was the best I could do. I have no idea what is causing the overlarge donut reflections. Even a slight movement of the FOV caused them to multiply and brighten greatly. 14" LX200R@F/10, 2x30 minutes H-alpha binned 2x2, STL-11000M, 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". What is the circular dark object in the lower right hand corner? |
#3
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ASTRO: Flame Nebula NGC 1977
"Hucom Saavi-Meitrel" wrote in message ... Rick Johnson wrote: This shot gives a whole new meaning to reflection "nebula"! With a big bright moon nearby I decided to try the H-alpha filter on the Flame. I quickly discovered I hate Alnitak (Zeta Orionis). No matter what I did it put nasty reflections in the image. Put it out of the field and they were really bad unless it was so far out so was much of the nebula. Put it in the field and they wiped out most of the western half. I finally found if I cut off the "top" of the nebula I could minimize the damage. I even waited until it was west of the meridian and thus the camera upside down to see if that helped. Not much if any -- it was still pretty bad. This was the best I could do. I have no idea what is causing the overlarge donut reflections. Even a slight movement of the FOV caused them to multiply and brighten greatly. 14" LX200R@F/10, 2x30 minutes H-alpha binned 2x2, STL-11000M, 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". What is the circular dark object in the lower right hand corner? Those are the reflections he was referring to, I suspect. George |
#4
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ASTRO: Flame Nebula NGC 1977
Hucom Saavi-Meitrel wrote: Rick Johnson wrote: This shot gives a whole new meaning to reflection "nebula"! With a big bright moon nearby I decided to try the H-alpha filter on the Flame. I quickly discovered I hate Alnitak (Zeta Orionis). No matter what I did it put nasty reflections in the image. Put it out of the field and they were really bad unless it was so far out so was much of the nebula. Put it in the field and they wiped out most of the western half. I finally found if I cut off the "top" of the nebula I could minimize the damage. I even waited until it was west of the meridian and thus the camera upside down to see if that helped. Not much if any -- it was still pretty bad. This was the best I could do. I have no idea what is causing the overlarge donut reflections. Even a slight movement of the FOV caused them to multiply and brighten greatly. 14" LX200R@F/10, 2x30 minutes H-alpha binned 2x2, STL-11000M, Paramount ME Rick -- What is the circular dark object in the lower right hand corner? George is right. The reflections make dozens of out of far out of focus images of Alnitak. In a reflector those are bright donuts with dark holes where the secondary is. Higher in the image they overlap so they are just a mass of fog looking something like the nebula itself except they move and multiply with only a slight movement of the scope. Low you see individual reflections with little overlap. The sky in that area would be as dark as the hole if not for the reflections. 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". |
#5
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ASTRO: Flame Nebula NGC 1977
"Rick Johnson" wrote
.... Great image Rick! It makes me want to go back and re-do this object with a focal reducer. Here's my 10 minute exposure (full spectrum, with poor collimation): http://www.kopernik.org/images/archive/n2024.htm George N |
#6
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ASTRO: Flame Nebula NGC 1977
George Normandin wrote: "Rick Johnson" wrote ... Great image Rick! It makes me want to go back and re-do this object with a focal reducer. Here's my 10 minute exposure (full spectrum, with poor collimation): http://www.kopernik.org/images/archive/n2024.htm George N I don't know what the source of all those reflections is. Just started so something has changed, I just don't know what. I'm seeing it on any bright star lately. Just suddenly happened. Link didn't work for some reason. Got the webpage but the picture was broken. 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". |
#7
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ASTRO: Flame Nebula NGC 1977
Make that NGC 2024.
I had crossed brain cells when I called it 1977. I am still processing the Running Man. Will post it when I get it finished. No reflection problem with it! Sorry for the mix-up. I can get new memory for the computer but for me new memory chips are hard to come by. I seem to be an obsolete model. 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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