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ASTRO: Eastern Veil with Atik 383
I spent four (short) nights for a total of 10 hours imaging time in the
first half of July on the eastern part of the cirrus nebula (NGC 6992/6995). The larger chip of my (rather) new Atik 383 camera allowed for a larger scale than previous attempts with my SXV-H9 camera. Nights were very warm, one of them well above 20 degrees celsius, so I could only cool the camera to -15 degrees that night. I didn't have darks for that temperature (only for -20 deg), so I had to scale the darks, but scaled them the wrong way (dividing the dark signal by 2 instead of multiplying with 2). That error didn't seem to have much effect on the final image as the 8300 chip has a rather low dark current (but still benefits from darks, unlike the SXV-H9, where using darks usually gives worse results than without darks). Taken from the middle of Berlin with a Skywatcher ED120 plus Skywatcher 0.85 reducer on a H-EQ5 Synscan mount. Atik 383 L+ camera with Baader Halpha and OIII filters, 17x20 minutes Ha and 14x20 minutes OIII, combined to a Ha:OIII:OIII. http://ccd-astronomy.de/temp4/6992coloursmallneugut.jpg Stefan |
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