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Hemisphere:  Northern
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Comet C/2015 F4 (Jacques) in Sagitta, 


            Tony Cook
Comet C/2015 F4 (Jacques) in Sagitta
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Comet C/2015 F4 (Jacques) in Sagitta

Technical card

Imaging telescopes or lenses: ASA N10 astrograph

Imaging cameras: canon 450D

Mounts: 10 Micron 1000 HPS

Focal reducers: ASA 3" Wynne Corrector 0.95x

Software: Russle Croman GradientXTerminator  ·  Noel Carbonni Astrotools  ·  Mike Unsold Images Plus  ·  Photoshop CS 2

Dates:July 20, 2015

Frames: 17x180" ISO800

Integration: 0.8 hours

Darks: ~36

Flats: ~25

Flat darks: ~25

Avg. Moon age: 4.11 days

Avg. Moon phase: 17.94%

Basic astrometry details job: 725657

RA center: 20h 2' 58"

DEC center: +19° 1' 58"

Pixel scale: 1.189 arcsec/pixel

Orientation: -88.833 degrees

Field radius: 0.843 degrees

Resolution: 4249x2829

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

Data source: Traveller


This was a test image to see if a good image of a faint fast moving comet (mag 11) could be obtained within 1 hour of imaging when nights are very short at high northern latitudes in summer using a fast F3.6 astrograph. True night on this date was about 90 minutes but clouds curtailed imaging.

Image was unguided, no dithering



Tony Cook
License: Attribution-NonCommercial-NoDerivs Creative Commons

Sky plot

Sky plot


Comet C/2015 F4 (Jacques) in Sagitta, 


            Tony Cook

In these public groups

Cloudy Nights
Comets Imaging