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ASTRO: NGC 2903
Stefan and I imaged this guy about the same time. I had taken something
low in the sky just before and had set the blue exposure time to 7 minutes to compensate for the loss of blue low in the sky. I forgot to reset to 5 when shooting this one. This means I got blue data in the dimmer parts of the image that didn't show much color data at all in the red and green images. Thus, the faint outer arms as well as the companion to the east (left) came out too blue where really faint. I've spent three days trying to fix it. Not being a photoshop expert it hasn't gone well. I just have had my fill and posting where I'm at. Think I have 2903 about right but the companion UGC 5086 has a red center and blue halo I doubt is correct. Fixing that screws up 2903 unless I isolate it and adjust only one which I don't like to do. Other faint galaxies show the same problem. LEDA 1648681 below 2903 is another example. Aladin says I picked up a QSO but it also says it is mag 20.9V. No way this shot went anywhere near that deep. The star barely shows on the Red POSS 2 plate though shows about like my shot on the blue. My software puts it at 19.0 which looks right to me. So is the QSO hiding behind a 19th mag star? It's B 0929+218 for those curious enough to look it up. 14" LX200R@F/10, L=6x5' RG=3x5' B=3x7' 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". |
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