Saturday, March 25, 2017
COMET JOHNSON Taken by Jan Curtis on March 24, 2017 @ Cheyenne, WY
With this night forecasted as the only clear one for the next week, I was lucky to have captured Comet Johnson under very good sky conditions. This image processed in Pixinsight and Photoshop CS 6.0 shows a small but brightening comet with a developing longer tail than last week.
Used Nikon d7100, Nikon 180mm f/2.8 @ f/5, iso 2000, exp. 41x118s. The comet only moved about 2 pixels or about 8 arcsec in about 82 minutes so I was able to have the comet and stars without showing drift (although I fixed the comet in this shot). The story was a lot different for Comet P41 (movement was easily detected in just 90 sec):