Messier 101 in Ursa Major (Steve Milne)

Celestial hemisphere: Northern · Constellation: Ursa Major (UMa) · Contains: M 101 · NGC 5457 · NGC 5461 · NGC 5473 · NGC 5477

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Messier 101 in Ursa Major

Link: https://stevemilne.smugmug.com/Photos/Sky/Galaxies/i-xmPjN2d

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Messier 101 in Ursa Major

Link: https://stevemilne.smugmug.com/Photos/Sky/Galaxies/i-xmPjN2d

Messier 101 (NGC 5457) is a face on spiral galaxy 21.8 million light years distant in the constellation of Ursa Major. It is 184,000 light years in diameter.

The galaxy was discovered by Pierre Méchain on 27 March 1781. He described it as a "Nebula without star, very obscure and pretty large, 6' to 7' in diameter".

[Information from: Atlas of the Messier Objects; Stoyan et al; Cambridge University Press 2008 (English edition)]

M101 was photographed between 14 March and 17 April 2023.

Capture details are as follows:

Telescope: TEC140
Camera: QHY 268M
Filters: Chroma
Mount: 10 Micron GM2000HPS

Ha: 37 x 600s
Lum: 77 x 300s
Red: 58 x 300s
Green: 58 x 300s
Blue: 57 x 300s

A total of 27 hours exposure.

Data: Steve Milne & Barry Wilson
Processing: Steve Milne

Entre Encinas y Estrellas (e-EyE)
The refractors!

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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	7608101
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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Messier 101 in Ursa Major

Messier 101 in Ursa Major

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Messier 101 in Ursa Major

Messier 101 in Ursa Major

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