Scope: Celestron 9.25 Edge 235 mm at f/7, Location: Shelter Valley, Anza Borrego Desert, CA   6 February 2016  Camera: ST8300M (Baader LRGB filters)

Exposure: Exposure: 16 x 8 min (2x2 bin) IR/UV block exposures;  8 x 4.5 min (3x3 bin) RGB exposures.

Processing: Data Collection -  Sequence Generator Pro (as FITs).  Calibrated, stacked (Sigma Kappa Combine) in Deep Sky Stacker, L - RGB channel registration, equalization - Astroart.  Curves, Levels, and Luminance development, RGB combine - Images Plus. Finishing  - Photoshop. Color calibration with eXcalibrator. This image uses UV/IR Block for the Luminance channel and then a LRGB combine with Luminance layering.  Saturation in LAB color.   Final Image size processed at approximately 3352x2532 cropped and resized to 2400x1800.

North is up in this image. PN 164.8+31.1 is a bright planetary nebula in the constellation of Lynx. It is the object that dominates this field. There a a number of background galaxies in the filed and two compact galaxy groups. The most prominent background galaxy is UGC 4085 toward the right edge of the image. - it is a member of a compact galaxy group (SDSSCGB-41529).  One of the background galaxies is seen through the blue / green glow of the planetary nebula.  These galaxies are identified  and highlighted in the annotated image.  The Horizontal FOV is 38' 

Image center is approximately - Equatorial 2000: RA: 07h 57m 46s Dec: +53°24'55"