M81 (Voirol Christian)

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

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M81

Revision title: M81 - 3rd version

Powered byPixInsight

M81

Revision title: M81 - 3rd version

After the premature death of my QHY294M, here is my first try with the QHY268M. I had to change the camera because QHY could not troubleshoot the QHY294M. As a result, I have a 26MP sensor and each file represents 51MB... So, for this first image, between the 50 darks, the 200 biases and the 2 sessions x 4 filters x 25 flats (since I work in nomadic mode, I dismantle the whole setup at each output) and the 28 lights, we are talking about 478 files of 51 MB, that is to say 24GB of data to process.

The WBP pre-processing on PixInsight has been done using an Azure virtual machine with 32 cores and 512GB of RAM. Using a shared disk that I load off-line from home, the processing takes about an hour. With my Dell Latitude, it's more than 4 hours.

Post-Processing on PixInsight: on each channel: DBESub, DBEDiv, LRGBCombi, HT

Original
B
Final
C

B

Title: M81 - 2nd version

Description: Postprocessing on PixInsight : on each channel : DBESub, DBEDiv, LinearFit on the L Channel, LRGB Combi, CurveTransformation, Crop, Rotation, HT

Uploaded: ...

C

Title: M81 - 3rd version

Description: Postprocessing on PixInsight : on each channel : DBESub, DBEDiv, LinearFit on the L Channel, LRGB Combi, CurveTransformation, Crop, Rotation, HT + Postprocessing with SharpenAI of TopazLab

Uploaded: ...

Please note: The following tables are updated every 24 hours.

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
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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
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Star trails
Northern lights
Noctilucent clouds
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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	Advanced success
Started	...
Astrometry.net job	5600036
PixInsight job	0OA48Z8V4QY2Q9W6B07NEQTKQHBGQFB1
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	09h55m36s.870
RA (top/left)	09h51m02s.179
RA (top/right)	09h53m50s.400
RA (bottom/right)	10h00m02s.441
RA (bottom/left)	09h57m27s.346

Dec (center)	+69°04′24″.33
Dec (top/left)	+69°22′39″.77
Dec (top/right)	+68°35′33″.100
Dec (bottom/right)	+68°45′42″.94
Dec (bottom/left)	+69°33′11″.37

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M81

Revision title: M81 - 3rd version

M81

Revision title: M81 - 3rd version

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Image Index:

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M81

Revision title: M81 - 3rd version

M81

Revision title: M81 - 3rd version

Equipment

Acquisition details

Description

Comments

Revisions

B

C

Sky plot

Histogram

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