Hemisphere:  Northern  ·  Constellation: Ursa Minor (UMi)
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A comet in summer midnight twilight, 



    
        

            Tony Cook
A comet in summer midnight twilight
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A comet in summer midnight twilight

Equipment

Imaging Telescopes Or Lenses
ASA N10 astrograph
Imaging Cameras
canon 450D
Mounts
10 Micron 1000 HPS
Accessories
ASA 3" Wynne Corrector 0.95x
Software
Noel Carbonni Astrotools · Mike Unsold Images Plus · Photoshop CS 2

Acquisition details

Dates:
June 12, 2015
Frames:
71x90" (1h 46' 30") ISO800
Integration:
1h 46' 30"
Darks:
70
Flats:
25
Flat darks:
25
Avg. Moon age:
25.21 days
Avg. Moon phase:
19.64%
Mean SQM:
19.00

Basic astrometry details

Astrometry.net job: 1039761

RA center: 14h51m10s.1

DEC center: +83°3148

Pixel scale: 1.191 arcsec/pixel

Orientation: 94.953 degrees

Field radius: 0.770 degrees

Resolution: 620x322

Locations: Dark Sky Site, Kirby Malzeard, North Yorkshire, United Kingdom

Description

This is a test image to see how effective a f3.6 astrograph is at dealing with very short "nights" near the summer solstice at 54 N. In fact it does not get astronomically dark but there is roughly a 100 minute period when its darker than 19.0 mpsas (magnitude per square arc second).

I used 70+ 90 second exposures to pull out Comet Lovejoy six months after its peak brightness. Not bad

Comments

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Sky plot

Histogram

A comet in summer midnight twilight, 



    
        

            Tony Cook

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