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ASTRO: New Image; Cone Nebula in [SII], [NII] and Ha Light
Tonight we had clear skies again. The seeing was a bit better tonight than
last, but nothing like Saturday. I was stumbling around trying to find a decent target and decided to have another look at the Cone, but this time using an [NII] filter along with the [SII] and Ha. There's little if any [OIII] signal in it. This area is interesting in those three filters. With a bit more exposure (maybe tomorrow), it could get pretty interesting. For some reason I liked the portrait orientation of this image so that's why it is done that way. I shot it with my ST10XME, AP155 and Cust Sci [SII], [NII] and Ha filters. Subexposures were 15 minutes and I shot only three subs with each filter for a total of 2 hours 15 minutes http://www.rdcrisp.darkhorizons.org/...2N2Ha_page.htm |
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ASTRO: New Image; Cone Nebula in [SII], [NII] and Ha Light
Yes, the seeing was excelent here in Pleasanton, also. Looked at the planets
with my C-11. Exelent photo of the Cone, Crisp. Whish, my scope would show it like that. (-: Julius "Richard Crisp" wrote in message om... Tonight we had clear skies again. The seeing was a bit better tonight than last, but nothing like Saturday. I was stumbling around trying to find a decent target and decided to have another look at the Cone, but this time using an [NII] filter along with the [SII] and Ha. There's little if any [OIII] signal in it. This area is interesting in those three filters. With a bit more exposure (maybe tomorrow), it could get pretty interesting. For some reason I liked the portrait orientation of this image so that's why it is done that way. I shot it with my ST10XME, AP155 and Cust Sci [SII], [NII] and Ha filters. Subexposures were 15 minutes and I shot only three subs with each filter for a total of 2 hours 15 minutes http://www.rdcrisp.darkhorizons.org/...2N2Ha_page.htm |
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ASTRO: New Image; Cone Nebula in [SII], [NII] and Ha Light
Thanks for a wonderful image.
"Stumbling," indeed! " We should all stumble so well. "For some reason..?" The reason is that you have very good aesthetic sensibilities. Clear skies, Bill Meyers Richard Crisp wrote: Tonight we had clear skies again. The seeing was a bit better tonight than last, but nothing like Saturday. I was stumbling around trying to find a decent target and decided to have another look at the Cone, but this time using an [NII] filter along with the [SII] and Ha. There's little if any [OIII] signal in it. This area is interesting in those three filters. With a bit more exposure (maybe tomorrow), it could get pretty interesting. For some reason I liked the portrait orientation of this image so that's why it is done that way. I shot it with my ST10XME, AP155 and Cust Sci [SII], [NII] and Ha filters. Subexposures were 15 minutes and I shot only three subs with each filter for a total of 2 hours 15 minutes http://www.rdcrisp.darkhorizons.org/...2N2Ha_page.htm |
#4
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ASTRO: New Image; Cone Nebula in [SII], [NII] and Ha Light
"Bill Meyers" wrote in message ... Thanks for a wonderful image. "Stumbling," indeed! " We should all stumble so well. Let me explain the stumbling. I had intended to image V838 Monocerous. It had this amazing ejection of matter some time back and I had seen a wonderful RGB image from Arne Hendon/Al Kelly. I felt that an emission line image may be interesting, so that was my intended target. Well it turns out that V838 has gone into remission I guess. The cool nebulosity surrounding it seems to be gone. This is what it looked like back in the Fall of 2003: http://www.ghg.net/akelly/v838lar3.jpg This is the Al Kelly/Arne Hendon image I had mentioned above. You can understand why that was attractive to me :-) Anyway after washing out on that, there was a little planetary I wanted to potentially image. But it wound up being a lot smaller in diameter than I could image properly with the configuration I was using. So then I decided to have a look at a lot of the little planetaries in the basic area of the Rosette. They were all too dim or too small or both. So then I thought maybe I'd do a bit of the core of the Rosette, but didn't like the FOV being so small. I then thought about trying for McNeil 1, that new nebula in Orion, but it was too small for my FOV too. Well to make a long story short, I fooled around for over an hour and a half trying to find an acceptable target before finally settling on a redo of the Cone. I had shot a widefield of the area in the early fall, and learned then that there was no [OIII] in it,. but in the meantime I had picked up an [NII] filter. Since there was a lot of Ha and [SII] that I had found in the fall, I decided to try adding some [NII] in and that paid off. I stopped gathering data after three exposures through each of my filters, I wanted to make sure this thing would be worthwhile to continue investing time to image. So that's why I stopped after 2.25 hours; I wanted to see what I had so far. Now that I know it is worthwhile, I will collect more data to have a less noisy image. Here's that widefield that I shot last fall: http://www.rdcrisp.darkhorizons.org/...ssion_page.htm best wishes Richard |
#5
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ASTRO: New Image; Cone Nebula in [SII], [NII] and Ha Light
More great images! Thank you, Richard.
Bill Meyers Richard Crisp wrote: "Bill Meyers" wrote in message ... Thanks for a wonderful image. "Stumbling," indeed! " We should all stumble so well. Let me explain the stumbling. I had intended to image V838 Monocerous. It had this amazing ejection of matter some time back and I had seen a wonderful RGB image from Arne Hendon/Al Kelly. I felt that an emission line image may be interesting, so that was my intended target. Well it turns out that V838 has gone into remission I guess. The cool nebulosity surrounding it seems to be gone. This is what it looked like back in the Fall of 2003: http://www.ghg.net/akelly/v838lar3.jpg This is the Al Kelly/Arne Hendon image I had mentioned above. You can understand why that was attractive to me :-) Anyway after washing out on that, there was a little planetary I wanted to potentially image. But it wound up being a lot smaller in diameter than I could image properly with the configuration I was using. So then I decided to have a look at a lot of the little planetaries in the basic area of the Rosette. They were all too dim or too small or both. So then I thought maybe I'd do a bit of the core of the Rosette, but didn't like the FOV being so small. I then thought about trying for McNeil 1, that new nebula in Orion, but it was too small for my FOV too. Well to make a long story short, I fooled around for over an hour and a half trying to find an acceptable target before finally settling on a redo of the Cone. I had shot a widefield of the area in the early fall, and learned then that there was no [OIII] in it,. but in the meantime I had picked up an [NII] filter. Since there was a lot of Ha and [SII] that I had found in the fall, I decided to try adding some [NII] in and that paid off. I stopped gathering data after three exposures through each of my filters, I wanted to make sure this thing would be worthwhile to continue investing time to image. So that's why I stopped after 2.25 hours; I wanted to see what I had so far. Now that I know it is worthwhile, I will collect more data to have a less noisy image. Here's that widefield that I shot last fall: http://www.rdcrisp.darkhorizons.org/...ssion_page.htm best wishes Richard |
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