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Subject
Comet Q4 NEAT
Date
17th May 2004
Telescope or Lens
TEC APO 140 with AP 0.75 focal reducer
Mount
G11
Camera
ST2000XM
Filters
Hutech LPR
Total Exposures L 26 min 40 sec R   G   B  
Sub exposure
2 frames each 20 x 40 sec.
Binning
Luminance 1x1 RGB 2x2
Field of view and resolution
Approx 110 x 43 Arcminute. 2.18 Arcsec / Pixel
Comments  
Guiding was on the comet nucleus using an MX716 through a Celestron 80mm F5 refractor using a 2x teleconverter to give a focal length of 800mm. The G11 mount was trained to follow the comet using the Gemini comet tracking facility.

This is the best image I have produced of the comet so far. It is quite low down in the West after twighlight and rapidly falls into an area of light pollution. The atmospheric conditions have not been ideal with a great deal of moisture in the air. Time is also a factor as the comet falls below obstacles in my topography before a full set of LRGB images can be obtained. I have tried doing RGB without luminance but the pollution and moisture have made this difficult and the results are poor. A larger stack produces better results but I then hit the time limt again. I will endeavour to take a better image once the comet has climbed a little highr and clears the tree blocking the view from my observatory. Again this will not be ideal as the Moon will be in the sky and the comet is starting to fade. The mosaic match was the best I could get without loosing what little detail I had. The negative image shows up the structure a little better.