PK 164+31.1, planetary nebula, with the Explore-Levy comet hunter
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Note to Macintosh users: this image is adjusted for a display gamma of 2.2 to conform to more viewers. Please adjust for this (or it will be washed out!)

Cataloged by the Czech astronomers Perek and Kohoutek, PK164+31.1, is a very faint planetary nebula lying in the constellation Lynx.
It subtends about 400 arc seconds, but has a magnitude of only 14.0. Some guider problems (clouds) limited the total exposure to 110 minutes
leading to some noise in the finished image. I plan H alpha for this if weather cooperates this year.
This image is a stack of 11 ten-minute sub exposures, acquired, calibrated , stacked, and first color in Nebulosity 2.2.4.
Final color, curves, and gradients in Photoshop.

The scope is a 152mm f/4.8 piggybacked on the 12 inch LX200 classic.
Canon 350d Hap Griffin mod at prime, guided with a DSI pro and PHD on the 12 inch at f3.3
Julian, California - 17 February, 2010