M81
Need
a smaller image? Try one of these:
900x657 pixels
750x548 pixels
or here's M81
with funky stars
Imaging
Equipment:
- Telescope:
Takahashi FS-152 f/8 fluorite refractor
- Zeiss
II German Equatorial Mount
- Santa
Barbara Instrument Group ST-8E NABG CCD camera (1530 x 1020 pixels, 9 x 9mm, monochromatic, 16 bit, 13.8 x 9.2mm array)
- CWF8
color filter wheel with IR-blocking red, green and blue dichroic filters
Exposure
Information:
- Date:
Saturday, March 23, 2001
- Location:
Joshua Tree National Park, CA
- Elevation:
Approx. 4000', OAT +48F
- Conditions:
Windy, moderate seeing conditions.
- Total
exposure time: 190 minutes. LRGB=100:30:30:30 minutes at f/8
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