M81 (dkamen) - AstroBin

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

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M81

Link: https://dktf.smugmug.com/Quarantine/i-ZzRmrtL/A

Powered byPixInsight

M81

Link: https://dktf.smugmug.com/Quarantine/i-ZzRmrtL/A

Almost two months' worth of M81. For every channel there were approximately +10% more subs which I didn't keep (20% for L).

With 10 second subs I didn't have to guide, but every 60-70 subs I would pause, plate solve and correct my position (staying within 5-10 arcsecs of the target). This is essentially dithering every 60-70 subs and combined with the thousands of available subs made the raw material ideal for 2X drizzle.

I used Siril for quick integration of my material, to see what channel I needed more data for. It is super fast. And the R,G,B channels in the final image were done with Siril. But I ended up using AstropixelProcessor for L, because I found it gave slightly better SNR. Most of the linear post processing (LRGB combination, gradient removal, color calibration, stretching) was done in APP and most of the non linear finishing touches were done in Darktable. But Pixinsight did help at the very first stage (I used DynamicCrop and star alignment to register the L,R,G,B master subs) and in the middle (HDRMultiscaleTransform on the image that came out of APP and some curve work before forwarding it to Darktable).

Suburban Astrophotography
Short exposures DSO

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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.

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
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.
Promotions by Submitters When 3 distinct Submitters promote the image, it moves on to the next stage of the process: evaluation for Top Pick status. This requirement, in addition to anonymization of images and distribution to only a subset of them, prevents biases and ensures that the best images are selected.
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.

Status	Basic success
Started	...
Astrometry.net job	4416073
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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M81

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Image Index:

Contribution Index (beta):

M81

M81

Equipment

Acquisition details

Description

Comments

Sky plot

Histogram

In these public groups

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