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Ha only
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Ha only (boosted processing to show the outer ring)
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Ha and [OIII] data (Ha = Red, Green = Blue = OIII)
taken on August 28, 2003 from Fremont Peak State Park, near San Juan Bautista, Ca. ([OIII data])and on September 1, 2003 from my backyard in Castro Valley, Ca. (Ha data)
Celestron C14 imaging scope @ f/11 (F=3910mm)
Finger Lakes Instrumentation IMG1024S imaging camera @-30C (Ha) and at -27C ([OIII])
RCOS Optical Systems Dichroic Beam Splitter
SBIG ST7E Guide camera controlling
SBIG AO7 Adaptive Optics System
Astro-Physics AP1200GTO mount
Finger Lakes Instrumentation CFW1 Color Filter wheel
Custom Scientific Narrowband Emission Line Filters
Hydrogen alpha 656.3nm 3nm FWHM
[Oxygen III] 500.7nm 3nm FWHM
Eight exposures of fifteen minutes through Ha filter, three exposures of 10 minutes through [OIII] filter
Total exposure time: 2 hours 30 minutes
Maxim DL 3.20 used for image acquisition, calibration, DDP, color combination
CCDSOFT 5.00.071 used for guiding/AO7 control
SIGMA Prebeta 11 used for darks, flats and image stacking