M101 (Alex) - AstroBin

Celestial hemisphere: Northern · Constellation: Ursa Major (UMa) · Contains: M 101 · NGC 5457 · NGC 5461 · NGC 5471

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M101

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M101

Probably the last image of the season as the clocks have gone forwards now and it's not properly dark until around 9pm

Not a great finish. The second half of the luminance images were lost due to a focus problem. I think the focus must have slipped as the target rose higher in the sky, and I didn't have an automatic or periodic refocus option set.

Equipment:

iOptron CEM25P mount

Skywatcher ED80 DS Pro (510mm Focal Length with 0.85x Reducer/Flattener)

ZWO ASI 183MM Pro Imaging Camera (Cooled to -15 degC)

ZWO ASI 120MM-S Guide Camera

ZWO Mini EFW

SkyWatcher 9x50 Finder as guide scope

Nanopi M4 running Armbian with KStars and EKOS/INDI for capture and guiding

Acquisition:

Night of the 27th March 2020

88 x 60secs Luminance

8 x 180secs Red

8 x 180secs Green

8 x 180secs Blue

160 mins Total Exposure

64 darks

25 flats

256 bias

Pre-Processing:

Stacked in Siril using Sirilic

Main Image Processing in Star Tools:

Bin 50%

Crop

Wipe

Develop

Deconvolution

HDR

Contrast

Colour

Psychovisual De-Noise

Magic - Star reduction

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
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	3367968
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

Image Index:

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M101

M101

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Image Index:

Contribution Index (beta):

M101

M101

Equipment

Acquisition details

Description

Comments

Sky plot

Histogram

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