Celestial hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  Bode's nebulae  ·  M 81  ·  NGC 3031
Bodes Galaxy, Don Curry
Bodes Galaxy
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Bodes Galaxy

Bodes Galaxy, Don Curry
Bodes Galaxy
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Bodes Galaxy

Equipment

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Acquisition details

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Description

This is my optimized proper stack of M81 using only the best of my 27 sub 4 minute run only using calibrated files for 8 240 second darks ISO 400, Bias 9 1/4000th of a second, flats 9 2 second sky flats, ISO 400. I was stacking at 1 to 1 pixel without any alteration of data and dumped the additional various other subs with many different images times and now the results are much better.

I did attempt to stack seperately my 11 5 minute subs as well,but the core of M81 was blown out without any stretch at all so I had to scrub those subs.

Thus from my backyard with my hyperstar at F1.8 520mm Celestron C11 I cannot go past 240 second subs without running into this problem even with using a new IDAS-D1 filter in front of the Hyperstar III lens.

Comments

Sky plot

Sky plot

Histogram

Bodes Galaxy, Don Curry

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Cloudy Nights