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ASTRO: NGC 7128 Colorful star cluster in great star field
NGC 7128 is an open cluster in the constellation of Cygnus. The
distance to it has usually been put at about 7500 light years but I found a well researched paper indicating it is more like 13000 light years away give or take 10%. This puts it on the edge of the Perseus arm of our galaxy rather than between arms. Since it is a rather young cluster, something over 10 million years old, it wouldn't have had time to move out of an arm as the old distance estimates said. Another reason I like this new distance estimate. I was drawn to this cluster by Dreyer's description which mentioned that it contained a ruby star. Always liking carbon stars and other very red stars I had to view it at the first opportunity. When I did I found it contained two bright orange stars and a third fainter one but I never did see the ruby star Dreyer mentions. Still it is a great cluster visually due to the color contrast of those K giant stars standing in contrast to the blue B stars it contains. Clusters need the very best nights for seeing as otherwise the stars just look lousy. I hate to "waste" a good night of seeing on just stars but when it's one of your favorite visual clusters you do so. Though I cheated and only used one 10 minute shot for each color channel. When there are no faint fuzzies you can get away with that. Oddly when I put it together the color was so strong I had to turn it down. Usually I have to boost the color, especially of clusters. Not this time. I don't know why this turned out so differently as I didn't process it any differently. Sorry no faint fuzzies in the background. Just too much dust and gas in ours to let me see anything beyond. Image taken September 17, 2009. I'm not gaining on my backlog. 14" LX200R @ f/10, L=4x10' RGB=1x10'x3, 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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ASTRO: NGC 7128 Colorful star cluster in great star field
Nice cluster Rick. Not sure if it would hit the no. 1 spot in my cluster
charts, but certainly a nice one. Stefan "Rick Johnson" schrieb im Newsbeitrag . com... NGC 7128 is an open cluster in the constellation of Cygnus. The distance to it has usually been put at about 7500 light years but I found a well researched paper indicating it is more like 13000 light years away give or take 10%. This puts it on the edge of the Perseus arm of our galaxy rather than between arms. Since it is a rather young cluster, something over 10 million years old, it wouldn't have had time to move out of an arm as the old distance estimates said. Another reason I like this new distance estimate. I was drawn to this cluster by Dreyer's description which mentioned that it contained a ruby star. Always liking carbon stars and other very red stars I had to view it at the first opportunity. When I did I found it contained two bright orange stars and a third fainter one but I never did see the ruby star Dreyer mentions. Still it is a great cluster visually due to the color contrast of those K giant stars standing in contrast to the blue B stars it contains. Clusters need the very best nights for seeing as otherwise the stars just look lousy. I hate to "waste" a good night of seeing on just stars but when it's one of your favorite visual clusters you do so. Though I cheated and only used one 10 minute shot for each color channel. When there are no faint fuzzies you can get away with that. Oddly when I put it together the color was so strong I had to turn it down. Usually I have to boost the color, especially of clusters. Not this time. I don't know why this turned out so differently as I didn't process it any differently. Sorry no faint fuzzies in the background. Just too much dust and gas in ours to let me see anything beyond. Image taken September 17, 2009. I'm not gaining on my backlog. 14" LX200R @ f/10, L=4x10' RGB=1x10'x3, 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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