Caldwell 9 is an emission nebula in the Cepheus constellation. It is better known as the Cave Nebula.
Image taken using the 32-inch Schulman telescope on Mt. Lemmon, AZ with STL-11000M camera and A/O. Original data frames by Adam Block. Repetitive LLRGB image processing by JDS using Maxim DL4 and Photoshop CS5.
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