Ursa Major (UMa)

AY Tf5P9fZ4G 1824x0 MW 2Dxb

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Imaging Telescopes Or Lenses : Planewave CDK12.5
Imaging Cameras : QHYCCD QHY268 M
Mounts : Astro-Physics 1100GTO
Filters : Astrodon Clear 50 mm · Astrodon Gen1 E-Series Tru-Balance Red · Astrodon Gen2 E-Series Tru-Balance Red 36 mm
Accessories : Astro-Physics 2.7″ Photo-visual Telecompressor (27TVPH)
Software : Pleiades Astrophoto PixInsight · Stefan Berg Nighttime Imaging ‘N’ Astronomy (N.I.N.A. / NINA) · PHD2
Guiding Telescopes Or Lenses : Planewave CDK12.5
Guiding Cameras : ZWO ASI174MM Mini

Acquisition details

Dates : June 10, 2021
Frames : Astrodon Clear 50 mm: 127×120″(4h 14′) , Astrodon Gen2 E-Series Tru-Balance Red 36 mm: 24×240″(1h 36′)
Integration : 5h 50′
Avg. Moon age : 0.05 days
Avg. Moon phase : 0.00%


First LRGB with the CDK + AP Reducer

Limiting data capture to 6hrs (single night).

I was only able to get 8 x 4min per RGB filter.

This reducer is not ideal and the Planewave reducer was ordered later.

The Pinwheel Galaxy (M101 or NGC 5457) is a face-on spiral galaxy.

Its almost twice our milkyway galaxy, 170,000 light years across and 1 Trillion stars! 21 million light-years from Earth.


Optics : Planewave CDK12.5, 318mm, f/6.5, 2066mm

Camera : QHY268m (mode1, gain:56, offset:40)

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