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Caldwell 9. Cave nebula
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Caldwell 9 in Patrick Moor's catalogue is an emission nebula 2400 LY distant in Cepheus, imaged with a canon 200D & pier mounted 8" reflector on a EQ6 Pro mount. Guided with the Gerald made off axis guider. 2 1/4 hours Ha filter and 5 hours UHC. Bill C
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