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Cave Nebula (Caldwell 9) – Constellation Guide
https://www.constellation-guide.com/cave-nebula-caldwell-9/
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emission nebula
cepheus
caldwell 9
cave nebula
cepheus b
sh2-155
The Cave Nebula (Sh2-155, Caldwell 9) is an emission nebula located approximately 2,400 light-years away in the northern constellation Cepheus. With an apparent magnitude of 7.7, it can be observed in medium telescopes.
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