#1
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ASTRO: NGC 6914
This is one of those NGC objects with an identity crisis. Some sources
say it is the uppermost blue reflection nebula. Others say it is the entire complex that runs well out of my field with a center down out of my field. NED takes the former view, SIMBAD the latter. SIMBAD refers to the three reflection nebula, south (bottom) to north as [RK68] 100, [RK68] 101 and [RK68] 102. The last being what NED says is 6914. Whatever it is a pretty area. To get the reflection nebula I had to do this as LRGB. Trying to include H alpha just ruined the reflection nebula color and dimmed it considerably. So I added time to the L image to bring up the signal. This was a bear to process due to it being done at the worst part of my flat problem but taking the frames over several nights due to clouds helped. The donuts were all over the place and sigma reject got rid of some, but not all, of the problem. Fortunately donuts don't hurt the color data like they do the luminosity data so I could survive those repairs without it showing. I'm leaving town in a couple hours so if you have any comments I'll get to them when I get back next week. This is one of those trips that may get me back by Sunday or mid week, just depends on factors beyond my control. I see I screwed up the file name. I used 10 10 minute frames not 8 as the file name would indicate. Oh well. That happens when you are in a hurry. 14" LX200R @ f/10, L=10x10', RGB=2x10' all binned 2x2, 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: NGC 6914
Excellent image - will have to rethink my minimalist approach to data
collection. FWIW, the reflection nebulae are Vdb 131/132, Uranmetria list the emission part as DWB-100-5-9. On Thu, 25 Oct 2007 10:07:23 -0500, Rick Johnson wrote: This is one of those NGC objects with an identity crisis. Some sources say it is the uppermost blue reflection nebula. Others say it is the entire complex that runs well out of my field with a center down out of my field. NED takes the former view, SIMBAD the latter. SIMBAD refers to the three reflection nebula, south (bottom) to north as [RK68] 100, [RK68] 101 and [RK68] 102. The last being what NED says is 6914. Whatever it is a pretty area. To get the reflection nebula I had to do this as LRGB. Trying to include H alpha just ruined the reflection nebula color and dimmed it considerably. So I added time to the L image to bring up the signal. This was a bear to process due to it being done at the worst part of my flat problem but taking the frames over several nights due to clouds helped. The donuts were all over the place and sigma reject got rid of some, but not all, of the problem. Fortunately donuts don't hurt the color data like they do the luminosity data so I could survive those repairs without it showing. I'm leaving town in a couple hours so if you have any comments I'll get to them when I get back next week. This is one of those trips that may get me back by Sunday or mid week, just depends on factors beyond my control. I see I screwed up the file name. I used 10 10 minute frames not 8 as the file name would indicate. Oh well. That happens when you are in a hurry. 14" LX200R @ f/10, L=10x10', RGB=2x10' all binned 2x2, STL-11000XM, Paramount ME Rick |
#3
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ASTRO: NGC 6914
"Rick Johnson" wrote in message ... This is one of those NGC objects with an identity crisis. Some sources say it is the uppermost blue reflection nebula. Others say it is the entire complex that runs well out of my field with a center down out of my field. NED takes the former view, SIMBAD the latter. SIMBAD refers to the three reflection nebula, south (bottom) to north as [RK68] 100, [RK68] 101 and [RK68] 102. The last being what NED says is 6914. Whatever it is a pretty area. To get the reflection nebula I had to do this as LRGB. Trying to include H alpha just ruined the reflection nebula color and dimmed it considerably. So I added time to the L image to bring up the signal. This was a bear to process due to it being done at the worst part of my flat problem but taking the frames over several nights due to clouds helped. The donuts were all over the place and sigma reject got rid of some, but not all, of the problem. Fortunately donuts don't hurt the color data like they do the luminosity data so I could survive those repairs without it showing. I'm leaving town in a couple hours so if you have any comments I'll get to them when I get back next week. This is one of those trips that may get me back by Sunday or mid week, just depends on factors beyond my control. I see I screwed up the file name. I used 10 10 minute frames not 8 as the file name would indicate. Oh well. That happens when you are in a hurry. 14" LX200R @ f/10, L=10x10', RGB=2x10' all binned 2x2, STL-11000XM, Paramount ME Rick Great image, Rick. The area around the blue and the dark nebulas have more detail than any other image I've seen of this region. My scope wants to be like yours, Rick. :-) George |
#4
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ASTRO: NGC 6914
"Rick Johnson" wrote
... This is one of those NGC objects with an identity crisis. Some sources say it is the uppermost blue reflection nebula. Others say it is the entire complex that runs well out of my field with a center down out of my field. ........... Great image Rick! Really neat! Well worth the processing effort! When thinking about these "NGC Questions" I think you have to consider what would show visually in a 10 to 15 inch scope under very dark conditions. That's what most of the NGC records. Here's Dr. Corwin's notes from the NGC Project website: NGC 6914 is the northern-most of three similar nebulae, probably all reflection nebulae -- the show up best on the POSS1 blue plate. Interestingly, the area on the red plate is dominated by a large HII region, centered 20-30 arcmin to the northeast of N6914. Are the reflection nebulae part of the same system of gas and dust, or are they merely superposed along the line of sight? I suspect the former, but of course can't say for sure. |
#5
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ASTRO: NGC 6914
Beautiful image Rick. The colour contrast is striking.
Stefan schrieb im Newsbeitrag ... Excellent image - will have to rethink my minimalist approach to data collection. FWIW, the reflection nebulae are Vdb 131/132, Uranmetria list the emission part as DWB-100-5-9. On Thu, 25 Oct 2007 10:07:23 -0500, Rick Johnson wrote: This is one of those NGC objects with an identity crisis. Some sources say it is the uppermost blue reflection nebula. Others say it is the entire complex that runs well out of my field with a center down out of my field. NED takes the former view, SIMBAD the latter. SIMBAD refers to the three reflection nebula, south (bottom) to north as [RK68] 100, [RK68] 101 and [RK68] 102. The last being what NED says is 6914. Whatever it is a pretty area. To get the reflection nebula I had to do this as LRGB. Trying to include H alpha just ruined the reflection nebula color and dimmed it considerably. So I added time to the L image to bring up the signal. This was a bear to process due to it being done at the worst part of my flat problem but taking the frames over several nights due to clouds helped. The donuts were all over the place and sigma reject got rid of some, but not all, of the problem. Fortunately donuts don't hurt the color data like they do the luminosity data so I could survive those repairs without it showing. I'm leaving town in a couple hours so if you have any comments I'll get to them when I get back next week. This is one of those trips that may get me back by Sunday or mid week, just depends on factors beyond my control. I see I screwed up the file name. I used 10 10 minute frames not 8 as the file name would indicate. Oh well. That happens when you are in a hurry. 14" LX200R @ f/10, L=10x10', RGB=2x10' all binned 2x2, STL-11000XM, Paramount ME Rick |
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