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The Medusa Nebula (Abel 21)

About this object

The Medusa Nebula, also known as Abel 21 and Sharpless 274 lies near the border of the constellations Gemini and Canis Minor. It’s a planetary nebula, meaning that the star that created it has shed a majority of its gas into space near the end of its life.

This image was taken with a Stellarvue SVS 130mm refractor with a QSI 583WSG camera. 3hrs and 20min of Red, Green and Blue filtered exposures were added to 10hrs of Hydrogen Alpha and 10hrs of Oxygen III filtered exposures for a total exposure time of 30hrs. The image was calibrated and processed in PixInsight 1.8.
Image Details

  • Optics : Stellarvue SVS 130 refractor
  • Mount: Paramount MYT
  • Camera: QSI 583
  • Filters: Astrodon 36mm RGB+5nm HA and 3nm OIII
  • Exposure: RGBHaOIII: 200:200:200:600:600
  • Camera/Mount Control: The Sky X, CCD Auto Pilot 5
  • Guiding: SX Loadstar
  • Processing: PixInsight 1.8,
  • Location: Stark Bayou Observatory, Ocean Springs, MS
  • Date: Nov-Dec 2016
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