Contains: NGC 7337, NGC 7335, NGC 7331, NGC 7320, NGC 7319, NGC 7318, Stephan's Quintet, NGC 7317
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NGC7331/Stephans Quintet - Example of a Challenging Night!

Technical card

Imaging telescope or lens: Teleskop-Service ONTC 8" f4

Imaging camera: ZWO ASI1600MM-Cool

Mount: Astro-Physics Mach1GTO

Guiding telescope or lens: Teleskop-Service ONTC 8" f4

Guiding camera: SXV Lodestar

Software: KDE Project Kstars/EkosINDILibPixInsightPhotoshop CS3

Filter: Baader LRGB 1.25'' CCD Filters

Accessory: Skywatcher Coma corrector

Resolution: 2106x1375

Dates: Oct. 19, 2017

Frames: 150x120"

Integration: 5.0 hours

Avg. Moon age: 29.25 days

Avg. Moon phase: 0.09%

Astrometry.net job: 1781135

RA center: 339.180 degrees

DEC center: 34.250 degrees

Pixel scale: 1.967 arcsec/pixel

Orientation: 270.751 degrees

Field radius: 0.687 degrees

Description

This image was taken on 10/19/2017 at the Staunton River Star Party. Sky looked clear but as night went on I found it very difficult to understand guiding RMS (growing) and HFR of stars (also growing). I was able to look at a Satellite IR loop and noticed a thin area of moisture/clouds was moving over us very quickly. Conferring with visual obervers nearby confirmed my observations that seeing had gone out the window! At the start of the night I was getting an HFR of around 1.3 for my stars and by 11pm it had grown to 3.0! Pretty huge change quickly.

Since guiding was continuing to work and the background level hadn't jumped up too much I decided to let Ekos plug through my LRGB sequence and see how it turned out.

The resulting data was very soft and lacking the usual punch of contrast I like, but I think it was salvageable and I thought it was interesting even on a night that falls apart you can still have fun imaging.

Comments

Author

mikefulb
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NGC7331/Stephans Quintet - Example of a Challenging Night!, mikefulb