The Medusa Nebula

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Abell 21 - The Medusa Nebula - Planetary Nebula in Gemini

by Bob and Janice Fera

Officina Stellare RC-360AST 14" f/8 Ritchey Chretien Cassegrain
with two-element field flattener

Apogee Alta U16M CCD Camera

Astrodon Filters

Ha-OIII-RGB Composite - 390:450:40:40:40 minutes

Sub Exposures: Ha:13x30m OIII:15x30m RGB:8x5m

Image acquired with CCDAutopilot

Processed in CCDstack and Adobe Photoshop

Taken December 31, 2013, January 1-3, 5, 2014 from Eagle Ridge Observatory, Foresthill, CA


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