M57 with the 1.1-meter Hall telescope, Lowell Observatory

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The Ring Nebula M57 (NGC 6720) in Lyra, seen in a three-color

reconstruction from BVR CCD frames taken with the 1.1-meter Hall

telescope at Lowell Observatory. The red frame emphasizes H-alpha and

{N II} emission; multiple emission lines contribute to both B and V

passbands. The blue color of the hot central star is apparent.

Credit: Bill Keel, University of Alabama.

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How this image was made: The 3 original narrow-band exposures, and the composit.

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