The Iris Reflection Nebula, NGC7023

(aka The Blue Frog Nebula)

To see the faint detail in this image, adjust your monitor's brightness and contrast to clearly show all 17 steps in this grayscale chart:

Click here for a larger image: ngc7023_1150x871

Imaging Equipment:

• Telescope: Celestron C11, 11" f/10 Schmidt-Cassegrain reduced to f/6.0
• 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 Ha and IR-blocking red, green and blue dichroic filters

Exposure Information:

• Date: Thursday October 3, 2002
• Location: Mt. Pinos, CA
• Elevation: Approx. 8300', OAT +36F
• CCD operating temperature: -27C
• Composition: LRGB with blue luminance
• B:R:G:B = 200:50:50:200 minutes. Total exposure time: 300 minutes
• All subexposures were 10 minutes each, unbinned
• Plate scale: 1.1 arc-sec/pixel

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