Celestial hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)
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Cassiopeia A Planetary Nebula., David Elmore
Cassiopeia A Planetary Nebula.
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Cassiopeia A Planetary Nebula.

Getting plate-solving status, please wait...
Cassiopeia A Planetary Nebula., David Elmore
Cassiopeia A Planetary Nebula.
Powered byPixInsight

Cassiopeia A Planetary Nebula.

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Description

Cassiopeia A is an Oxygen III - rich planetary nebula.  This is a greatly cropped portion of the Bubble Nebula HOOW image from right of center.  10 X Hydrogen-alpha, 7 X Oxygen III, 5 X Sulfur II each 10 minutes.  Image is HOO with Sulfur II added as white.

My telescope is F/3.8 with a focal length of 380mm.  This object would be a superb target for a much larger aperture fast telescope -- hint.

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Cassiopeia A Planetary Nebula., David Elmore