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Contains:  NGC 4789, NGC 4798
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Comet Johnson, 


            Tony Cook
Comet Johnson
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Comet Johnson

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:April 2, 2017

Frames: 23x300" ISO800

Integration: 1.9 hours

Darks: ~25

Flats: ~25

Flat darks: ~25

Avg. Moon age: 6.00 days

Avg. Moon phase: 35.53%

Mean SQM: 21.08

Basic astrometry details job: 1563898

RA center: 16h 30' 17"

DEC center: +47° 38' 20"

Pixel scale: 1.192 arcsec/pixel

Orientation: -89.652 degrees

Field radius: 0.830 degrees

Resolution: 4185x2769

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

Data source: Traveller


First chance to image C/2015 V2 (Johnson). The rate of movement against the background sky is minimal as its motion on this date was very nearly directly towards Earth. This makes comet and star isolation by the normal means very problematic. On this occasion the 2 hour stack is only composed of star aligned images meaning that the comet is very slightly elongated.



Tony Cook
License: Attribution-NonCommercial-NoDerivs Creative Commons

Sky plot

Sky plot


Comet Johnson, 


            Tony Cook

In these public groups

Comets Imaging
Cloudy Nights