Celestial hemisphere:  Northern  ·  Constellation: Canes Venatici (CVn)  ·  Contains:  IC 4277  ·  IC 4278  ·  M 51  ·  NGC 5194  ·  NGC 5195  ·  Whirlpool Galaxy
M51 23 min, TSquasar
M51 23 min
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M51 23 min

Acquisition type: Lucky imaging
M51 23 min, TSquasar
M51 23 min
Powered byPixInsight

M51 23 min

Acquisition type: Lucky imaging

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Description

First experience using Darks with AsiLive stacking.  Since they were only 5 second subs, I took over 600 dark frames.
What I noticed overall is that the dark frames work well with fewer lights.  But with over 1200 5 sec subs, natural dithering seems to make up what darks would have provided. (Natural dithering from the tracking error which moves the object over time and seems to produce the similar function as dithering.)
In any case this is a stack of 277 5 sec frames.  Much less than the previous attempt of 1330 frames with no darks.
Comparing the two it seems the 277 with darks produced comparable results as the 1330 frames without darks.

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M51 23 min, TSquasar

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Short exposures DSO