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ASTRO: SH2-187
Here's another one taken over 8 nights and 3 months due to the clouds.
In this case I wanted a lot more data as this guy is super faint but that wasn't to be and now with all the ice in the air it will have to wait for next year before I can add to it so will go with what I have so far. I don't know why it came out sort of a dirty red color instead of HII pink. There are a lot of dust lanes and maybe the whole area is overlaid with dust or my color data is off from being taken in different months and sky conditions. I just got the blue a few days ago with lots of fogging due to ice. When I subtracted that out the blue signal was weak compared to the other two. Maybe that has something to do with it. I found few images of this one on the net to compare to. One has it my color, another pink. Many are of the WRONG object. I found more shots of NGC 7822/SH2-171 identified as this object than I did of the real one. I don't understand the confusion. That guy is on my list but will have to wait for next year now. He's over an hour west of the real SH2-187 and my skies won't support taking it before it is gone. 14" LX200R @ f/10, L=5x10' RGB=2x10' all frames binned 3x3 to get enough signal at f/10, 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". |
#2
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ASTRO: SH2-187
that's a neat object Rick
usually when The Sky gets it wrong so does about half the amateurs that use The Sky as the end all be all database not sure if that's the issue here since the sharpless objects aren't a part of it in stock form though... "Rick Johnson" wrote in message ... Here's another one taken over 8 nights and 3 months due to the clouds. In this case I wanted a lot more data as this guy is super faint but that wasn't to be and now with all the ice in the air it will have to wait for next year before I can add to it so will go with what I have so far. I don't know why it came out sort of a dirty red color instead of HII pink. There are a lot of dust lanes and maybe the whole area is overlaid with dust or my color data is off from being taken in different months and sky conditions. I just got the blue a few days ago with lots of fogging due to ice. When I subtracted that out the blue signal was weak compared to the other two. Maybe that has something to do with it. I found few images of this one on the net to compare to. One has it my color, another pink. Many are of the WRONG object. I found more shots of NGC 7822/SH2-171 identified as this object than I did of the real one. I don't understand the confusion. That guy is on my list but will have to wait for next year now. He's over an hour west of the real SH2-187 and my skies won't support taking it before it is gone. 14" LX200R @ f/10, L=5x10' RGB=2x10' all frames binned 3x3 to get enough signal at f/10, 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". |
#3
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ASTRO: SH2-187
The Sharpless catalog was included in the professional astronomer
version of TS6 and unfortunately it had a systematic( 8 degree, arc- minute, can't remember) error. I had compiled my own SDB of sharpless objects and after imaging SH187 two years ago, I looked on the web and discovered the two or more images of CED 214 area mislabeled as Sh 187. When SB made their sharpless SDB on available on their web-site, I downloaded and tried it and discovered the error. Took them a couple of days to correct the error and re-post the recompiled SDB on their web site. I've a G2v calibrated lrgb image of Sh2-187 at http://astrophotos.net/pages/Nebula/sh2-187.htm Merry Christmas to everyone. On Thu, 20 Dec 2007 06:52:28 -0800, "Richard Crisp" wrote: that's a neat object Rick usually when The Sky gets it wrong so does about half the amateurs that use The Sky as the end all be all database not sure if that's the issue here since the sharpless objects aren't a part of it in stock form though... "Rick Johnson" wrote in message .. . Here's another one taken over 8 nights and 3 months due to the clouds. In this case I wanted a lot more data as this guy is super faint but that wasn't to be and now with all the ice in the air it will have to wait for next year before I can add to it so will go with what I have so far. I don't know why it came out sort of a dirty red color instead of HII pink. There are a lot of dust lanes and maybe the whole area is overlaid with dust or my color data is off from being taken in different months and sky conditions. I just got the blue a few days ago with lots of fogging due to ice. When I subtracted that out the blue signal was weak compared to the other two. Maybe that has something to do with it. I found few images of this one on the net to compare to. One has it my color, another pink. Many are of the WRONG object. I found more shots of NGC 7822/SH2-171 identified as this object than I did of the real one. I don't understand the confusion. That guy is on my list but will have to wait for next year now. He's over an hour west of the real SH2-187 and my skies won't support taking it before it is gone. 14" LX200R @ f/10, L=5x10' RGB=2x10' all frames binned 3x3 to get enough signal at f/10, 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". |
#5
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ASTRO: SH2-187
Do you happen to remember the different URL?
On Thu, 20 Dec 2007 11:43:48 -0600, Rick Johnson wrote: Glen, I'd found that shot at a different URL. Didn't realize it was yours. I can see the lack of blue in my shot compared to yours. That's what I suspected. The blue was very weak due to being taking through so much ice. Pushing it added way to much noise. I cranked back on red and green to get a sort of balance but then the shot appeared washed out in color. Even the RGB was weak. So I compromised and went with a somewhat noisy but weak blue. I'll have to try again for the blue but now the ice is in the air for the next three or four months making it a next fall project. Assuming it ever does clear off. 4 new moons now of clouds. It gets to you. For Sharpless objects I just use the coordinates from SIMBAD and enter them manually into The Sky. After checking the DSS plate for that position to make sure something is there that looks like the object I'm after. Several catalogs I downloaded that said they contained Sharpless objects either had errors or weren't fully The Sky compatible I gave up going that route. It only takes a couple seconds to type in the coordinates. Though a time or two I forgot it defaults to today's date for the epoch and didn't check the J2000 box so was "lost in space". Only 7 years of precession makes a big difference for my small FOV. I've found SIMBAD wrong a time or two as well. Even after Brian Skiff's efforts to fix the errors in it. I don't think there is a totally "correct" catalog of fainter objects out there. Rick |
#6
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ASTRO: SH2-187
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#7
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ASTRO: SH2-187
wrote in message ... The Sharpless catalog was included in the professional astronomer version of TS6 and unfortunately it had a systematic( 8 degree, arc- minute, can't remember) error. I am using TS5 but do own TS6 but never liked the way it looked after I got it so I haven't used it. |
#8
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ASTRO: SH2-187
I'm not familar with TS5 but agree with you about TS6. I use it only
for scope control, for planning and research I use Skymap Pro, Simbad and Vizar. doing some narrowband imaging this evening. Your images have inspired me to try narrowband again. On Fri, 21 Dec 2007 02:29:12 GMT, "Richard Crisp" wrote: wrote in message .. . The Sharpless catalog was included in the professional astronomer version of TS6 and unfortunately it had a systematic( 8 degree, arc- minute, can't remember) error. I am using TS5 but do own TS6 but never liked the way it looked after I got it so I haven't used it. |
#9
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ASTRO: SH2-187
It reminds me of a spider for some reason.
Rick Richard Crisp wrote: that's a neat object Rick usually when The Sky gets it wrong so does about half the amateurs that use The Sky as the end all be all database not sure if that's the issue here since the sharpless objects aren't a part of it in stock form though... "Rick Johnson" wrote in message ... Here's another one taken over 8 nights and 3 months due to the clouds. In this case I wanted a lot more data as this guy is super faint but that wasn't to be and now with all the ice in the air it will have to wait for next year before I can add to it so will go with what I have so far. I don't know why it came out sort of a dirty red color instead of HII pink. There are a lot of dust lanes and maybe the whole area is overlaid with dust or my color data is off from being taken in different months and sky conditions. I just got the blue a few days ago with lots of fogging due to ice. When I subtracted that out the blue signal was weak compared to the other two. Maybe that has something to do with it. I found few images of this one on the net to compare to. One has it my color, another pink. Many are of the WRONG object. I found more shots of NGC 7822/SH2-171 identified as this object than I did of the real one. I don't understand the confusion. That guy is on my list but will have to wait for next year now. He's over an hour west of the real SH2-187 and my skies won't support taking it before it is gone. 14" LX200R @ f/10, L=5x10' RGB=2x10' all frames binned 3x3 to get enough signal at f/10, 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". |
#10
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ASTRO: SH2-187
Beautiful image Rick, there really seems to be a lot of dust in that region.
I just wanted to write that this is a new object to me, but I checked my harddisk and found an image from last year. It is so much worse than yours though that it's hard to identify it with your version (http://www.slilge.de/Sharpless/sh2-187-24x10gut.jpg) Stefan "Rick Johnson" schrieb im Newsbeitrag ... Here's another one taken over 8 nights and 3 months due to the clouds. In this case I wanted a lot more data as this guy is super faint but that wasn't to be and now with all the ice in the air it will have to wait for next year before I can add to it so will go with what I have so far. I don't know why it came out sort of a dirty red color instead of HII pink. There are a lot of dust lanes and maybe the whole area is overlaid with dust or my color data is off from being taken in different months and sky conditions. I just got the blue a few days ago with lots of fogging due to ice. When I subtracted that out the blue signal was weak compared to the other two. Maybe that has something to do with it. I found few images of this one on the net to compare to. One has it my color, another pink. Many are of the WRONG object. I found more shots of NGC 7822/SH2-171 identified as this object than I did of the real one. I don't understand the confusion. That guy is on my list but will have to wait for next year now. He's over an hour west of the real SH2-187 and my skies won't support taking it before it is gone. 14" LX200R @ f/10, L=5x10' RGB=2x10' all frames binned 3x3 to get enough signal at f/10, 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". |
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