Hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  M 101  ·  NGC 5457  ·  The star 83UMa  ·  The star 84UMa  ·  The star 86UMa
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A relatively lonely M101, 


            Lee B
A relatively lonely M101
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A relatively lonely M101

Technical card

Imaging telescopes or lenses: Samyang 135 ED UMC F2

Imaging cameras: ZWO ASI533MC Pro

Mounts: Sky-Watcher AZ EQ6 GT Pro

Software: Starkeeper.it Voyager  ·  PixInsight  ·  Aries Productions Astro Pixel Precessor  ·  PHD2

Dates:Feb. 16, 2021

Frames: 70x60"

Integration: 1.2 hours

Avg. Moon age: 4.46 days

Avg. Moon phase: 20.88%

Basic astrometry details

Astrometry.net job: 4230502

RA center: 14h 0' 17"

DEC center: +54° 12' 10"

Pixel scale: 5.953 arcsec/pixel

Orientation: 131.753 degrees

Field radius: 3.050 degrees

Resolution: 2846x2346

Locations: Backyard, Scotland, United Kingdom

Data source: Backyard


Not a typical target for the Samyang but it seemed the only area of sky that had little to no cloud so I took a gamble. There's a few clearer faint galaxies showing alongside M101 & NGC 5474 which were cool to see come through.

This is 70 x 60s (70 minutes) subs @ F2 with the Samyang 135.

Captured with Voyager, stacked & calibrated in APP and processed in PixInsight.



  • Final
    A relatively lonely M101, 


            Lee B
  • A relatively lonely M101, 


            Lee B


Description: PixInsight solved image including PGC catalogue. Not quite as lonely after all - thanks @John Favalessa

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Sky plot

Sky plot


A relatively lonely M101, 


            Lee B

In these public groups

UK Astro-Imaging
Samyang 135 f/2