M81-M82 Neighborhood (Pat Darmody)

Celestial hemisphere: Northern · Constellation: Ursa Major (UMa) · Contains: Bode's nebulae · M 81 · M 82 · NGC 2976 · NGC 3031 · NGC 3034 · NGC 3077

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M81-M82 Neighborhood

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M81-M82 Neighborhood

Had some more fun with the ASI071MC Pro last week. I would like to get some additional integration time on this target. I am also thinking that at some of the stretched stars could be due to the sensor distance from the Skywatcher field flattener not being quite correct. The Skywatcher FF (no reduction, just a flattener) documentation says that it wants to have the sensor 61 mm behind the back end of the flattener. However, ZWO documentation talks about achieving 55 mm backfocus length and provides a couple of spacers to get there.

I have been following the Skywatcher recommendation (bought an additional spacer to do this), but things still looked pretty stretched at the edges - much more so than my DSLR images did. I think I'll just try the ZWO approach to see if there is a difference.

Thanks for looking!

Pat

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Description: Crop to eliminate some stretching and corner dark areas

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Cooled Color Cams
The OSC Club (One Shot Camera)

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Distribution of astrophotographers

This table shows the number of distinct astrophotographers who have been assigned and IOTD/TP award compared to the total number of images awarded.
	Distinct awarded users	Total awarded images
Image of the day
Top picks
Top pick nominations

Distribution of subject types

This table shows the distribution of awards per subject type, compared to the popularity of images of that subject type.
	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
Solar system
Extremely wide field
Star trails
Northern lights
Noctilucent clouds
Landscape

Distribution of data sources

This table shows the distribution of awards per data source, compared to the popularity of images acquired from that data source.
	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
Own remote observatory
Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
Mix of multiple sources
Other
Unknown

The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

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Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
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Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

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M81-M82 Neighborhood

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