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Cassiopeia A
Cassiopeia A
Credit: NASA, ESA, Hubble

Cassiopeia A - supernova remnant nebula

Cassiopeia A , is a supernova remnant nebula located in the constellation Cassiopeia .

Cassiopeia A is magnitude and is 5" in size. For reference, the full moon is 30' (arc minutes) or 0.5° in size.

      1. Name:
      2. Cassiopeia A
      1. Type:
      2. supernova remnant nebula
      1. Size:
      2. 5"

    * One can see up to magnitude 7-8 objects with perfect eyes under ideal dark sky conditions.