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Contains:  Benetnasch (ηUMa), The star Alkaid
Getting plate-solving status, please wait...
Catalina and Alkaid, 


            Tony Cook
Catalina and Alkaid
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Catalina and Alkaid

Technical card

Imaging telescopes or lenses: Televue TV-85

Imaging cameras: canon 450D

Mounts: 10 Micron 1000 HPS

Focal reducers: TeleVue TRF-2008 0.8x

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

Dates:Jan. 15, 2016

Frames: 61x240" ISO800

Integration: 4.1 hours

Darks: ~36

Flats: ~25

Flat darks: ~25

Avg. Moon age: 5.80 days

Avg. Moon phase: 33.47%

Mean SQM: 19.60

Basic astrometry details job: 929698

RA center: 13h 51' 52"

DEC center: +49° 15' 10"

Pixel scale: 2.250 arcsec/pixel

Orientation: 178.553 degrees

Field radius: 1.556 degrees

Resolution: 4116x2802

Locations: Home, Bramhope, West Yorkshire, United Kingdom


Comet C/2013 US10 (Catalina) passes Eta Ursae Majoris (Alkaid)

This was my first light image for my home observatory - 3 months after it was installed. The long delay was due to a succession of 6 strong Atlantic storms stretching from late October to late December (Abigail, Barney, Clodagh, Desmond, Eva and Frank).

Home is in outer suburbia and the skies are 3 to 4 times brighter than my remoter site.

Version B: Changed the Screen blend coefficient for the comet layer from 1.0 to 1.67 to better emphasise the ion and dust tails.

Other images of C/2013 US10

29th December 2015
1st January 2016
9th January 2016
15th January 2016
31st January 2016
28th February 2016
30th March 2016

3D Stereo (relaxed eyes) 15th January 2016
3D Stereo (crossed eyes) 15th January 2016
Evolution sequence



Tony Cook
License: Attribution-NonCommercial-NoDerivs Creative Commons


  • Final
    Catalina and Alkaid, 


            Tony Cook

Sky plot

Sky plot


Catalina and Alkaid, 


            Tony Cook

In these public groups

Comets Imaging
Cloudy Nights