D7000 DSLR Imaging: Cocoon Nebula
Posted: 10 December 2014
The sky became overcast during my previous session in the observatory. Cloudy skies continued until 9 December.
Open: Tuesday, 9 December 2014, 1819 MST
Conditions: Mostly clear
1826 MST: quick look at Mars, 83X. Then slewed to Caldwell 19 (Cocoon Nebula), my imaging target for the night before the waning gibbous moon rose. A hint of nebulosity was visible at 83X. Then slewed to the star Deneb, which would be the focus test star. Added the Antares f/6.3 focal reducer and mounted the D7000 DSLR at prime focus of the 8" LX200-ACF using a Meade off-axis guider. Then did a focus test on Deneb using a Spike-A Bahtinov Mask.
Slewed to Caldwell 19 (IC5146) and found a faint guide star in the illuminated reticle eyepiece (with Rigel Systems PulsGuide). Did an unguided 1 minute, ISO 6400, framing test exposure, which was good. This is a cropped image from a guided 5 minute, ISO 6400, exposure, post-processed using Neat Image software to reduce digital noise:
1903 MST: completed imaging and removed the camera and focal reducer from the telescope. 1913 MST: clouds coming in from the south.
I then began a tour of some Carbon Stars as described in a recent Sky & Telescope article. U Cygni appeared orange-red at 83X. T Lyrae also appeared orange-red at 83X. Tried for UX Draconis and S Celphi but didn't see any obvious red stars in the eyepiece.
1933 MST: couldn't do any more Carbon Star viewing due to increasing cloud cover.
I also did some beta testing of a soon-to-be-released program during this session.
Close: Tuesday, 9 December 2014, 2015 MST
Comments are welcome using Email. If you are on Twitter you can use the button below to tweet this report to your followers. Thanks.
Cassiopeia Observatory Home Page
Copyright ©2014 Michael L. Weasner / firstname.lastname@example.org
URL = http://www.weasner.com/co/Reports/2014/12/10/index.html