Hemisphere:  Northern  ·  Constellation: Canes Venatici (CVn)  ·  Contains:  M 3  ·  NGC 5272
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M3 - the dog's ...!, 


            Tom Gray
M3 - the dog's ...!
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M3 - the dog's ...!


Imaging Telescopes Or Lenses
William Optics Zenithstar II 80 ED
Imaging Cameras
Meade DSI 2 Color
Meade LX6 premier with 'smartdrive'
Bahtinov Mask
SiliconFields / Ivo Jager StarTools v1.6 · Stark Labs Nebulosity v3 · Meade Envisage V4.10

Acquisition details

March 21, 2021
20x60" (20')
Avg. Moon age:
7.29 days
Avg. Moon phase:

Basic astrometry details

Astrometry.net job: 4333565

RA center: 13h42m13s.7

DEC center: +28°2146

Pixel scale: 3.170 arcsec/pixel

Orientation: 183.301 degrees

Field radius: 0.402 degrees

Resolution: 713x569

Locations: Home 'observatory' (Bortle 5), Derbyshire, United Kingdom

Data source: Backyard


Having setup my DSCs on my LX6 mount, and run a pointing analysis (TPAS) using my Argo Navis Digital Telescope Computer, I was pleased to see M3 in the centre of FOV (not that it is difficult to find).

After a long stretch of bad weather, I spent some time touring the myriad fine open clusters that adorn the winter hexagon, delighted to be able to accurately and almost effortlessly ‘push to’ find these. If you haven’t ‘star gazed’ for a while, I’d encourage you to turn off the monitor, look up and enjoy the night sky.

Despite some haze, I decided to try an image using my DSI II OSC. 20m integration of unguided 60s exposures produced a reasonable image. With its tiny 1/2” chip, the Meade DSI II OSC has limited resolution, but reasonable FOV in my 80mm refractor, and the ‘postage stamp’ sized images are so quick to process.

I’ll leave it up to you to decide whether it was worth it, M3 is a fine globular cluster in Canes Venatici, a delight in an eyepiece, and impressive in higher resolution images.