The Details
Object
PK 205+14.1 The Medusa Nebula in Gemini
Optics
12.5" RCOS Ritchey-Chretien at f/6.9
Platform
Astro-Physics 1200 GTO
Camera
SBIG ST-10XME
Filters
Tru-Balance LRGB filter set
Date
09 March 2005
Location
Red Cloud Road, Eastern Riverside County CA
Exposure
L 10 x 300 sec 1x1 bin; RGB 4 x 300 sec 2x2 bin
Software
Maxim DL/CCD, Registar, Photoshop, Neat Image 4.4 Pro+
Orientation
Field of View: 22’23" x 15’32" centered on RA 07h29m00.4s
DEC 13°14’54” (2000.0). North angle 90.2 °; east 90° CCW from north
Notes

The Medusa Nebula, PK 205+14.1, is also known as Abell 21. This very large, low surface brightness planetary nebula is a challenge object for visual astronomers, spanning nearly 11.5 arc-minutes of sky. The Medusa's central star is the bluish colored star lying just left of the nebula's center.

This image was the result of a collaborative effort between Dave Jurasevich and David Held, sharing data acquisition and processing tasks.

 

 

 

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No reproduction of these images are permitted without prior approval of the author.