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

Acquisition details

Dates:
June 12, 2015
Frames:
71×90(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

File size: 76.4 KB

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

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A comet in summer midnight twilight, 



    
        

            Tony Cook

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