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Contains:  NGC 4798, NGC 4789
Getting plate-solving status, please wait...
Comet Johnson, 


            Tony Cook
Comet Johnson

Comet Johnson

Technical card

Resolution: 4185x2769

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 job: 1563898

RA center: 247.571 degrees

DEC center: 47.639 degrees

Pixel scale: 1.192 arcsec/pixel

Orientation: -89.652 degrees

Field radius: 0.830 degrees

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


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