M51-The Whirlpool Galaxy

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Here's an enlarged, cropped version of M51.

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: Luminance=100 minutes. RGB=20:20:30 minutes at f/8

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