Cas A Supernova Remnant

Rancho Del Sol Observatory · Camino, California

Cas A Supernova Remnant by Ken Crawford

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Image Equipment Details

  • RCOS 20" carbon truss - 100mm FFC
  • Paramount ME
  • Apogee Alta u16803
  • SBIG ST402 Guider
  • Astrodon MegaMoag
  • Astrodon 50mm Sq Filters

Exposure Details

  • Clear/ Lum = 240 minutes
  • Red = 180 minutes
  • Green = 180 minutes
  • Blue = 180 minutes
  • Ha 5nm = 540 minutes
  • OIII 3nm = 360 minutes
  • SII 5nm = 0 minutes

Software Used

  • MaxDL 5
  • CCDAutopilot 5
  • CCDStack2
  • Photoshop CS5

About this image


Cassiopeia A (Cas A) is a supernova remnant around 11,000 light-years away. Though it is very faint in optical light, it is one of the brightest extra solar radio sources in the sky. The lower right image shows the X-ray engery from NASA NuSTAR overlaid on top of Ken Crawford's optical image. Cas A Comparision link HERE. You may also see this image and write-up at NASA APOD.

Cas A Supernova Remnant detail
Cas A and X ray

Cas A SNR revealed with over 28 hours of total exposure time. Cas A X-ray data credit NASA/JPL-Caltech/DSS.

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These images may be used for personal or educational use without contacting me. But, these images and this website are Copyright © Ken Crawford. If you are a publisher and would like a full resolution link to this or other images please contact Ken Crawford.