M101, NGC 5473-4, NGC 5477, NGC 5485-6; Ursa Major (Thomas V. Davis)

Celestial hemisphere: Northern · Constellation: Ursa Major (UMa) · Contains: M 101 · NGC 5422 · NGC 5447 · NGC 5449 · NGC 5450 · NGC 5451 · NGC 5453 · NGC 5455 · NGC 5457 · NGC 5461 · NGC 5462 · NGC 5471 · NGC 5473 · NGC 5474 · NGC 5477 · NGC 5484 · NGC 5485 · NGC 5486 · Pinwheel galaxy

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M101, NGC 5473-4, NGC 5477, NGC 5485-6; Ursa Major

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M101, NGC 5473-4, NGC 5477, NGC 5485-6; Ursa Major

M101, NGC 5473-4, NGC 5477, NGC 5485-6; Ursa Major

Astro-Physics 160 (160TCC) f/5.8 refractor

KAI-11000M SBIG STL

Total Exposure Time: 17.6+ hours LHaRGB 370:300:130:120:140 minutes unbinned

February 2010; NMS, Mayhill, NM

Comments: M101 is readily seen even in small aperture telescopes as a slightly oval grey fuzzy blob. It requires larger apertures to tease out its spiral structure.

This image was taken and processed with the intent of showing the much fainter outer arm of M101; these are not commonly seen. These arms can just barely be seen in an older version of M101 that I took with much less exposure time.

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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	Advanced success
Started	...
Astrometry.net job	2096132
PixInsight job	DX13X3B6EAEVOWHTLX1V4KTI2K6Q8RVS
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	14h03m54s.60
RA (top/left)	14h09m26s.57
RA (top/right)	14h08m05s.35
RA (bottom/right)	13h58m04s.94
RA (bottom/left)	13h59m57s.31

Dec (center)	+54°08′40″.6
Dec (top/left)	+53°08′35″.10
Dec (top/right)	+55°17′20″.6
Dec (bottom/right)	+55°07′49″.5
Dec (bottom/left)	+52°59′22″.0

Image Index:

Contribution Index (beta):

M101, NGC 5473-4, NGC 5477, NGC 5485-6; Ursa Major

M101, NGC 5473-4, NGC 5477, NGC 5485-6; Ursa Major

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Image Index:

Contribution Index (beta):

M101, NGC 5473-4, NGC 5477, NGC 5485-6; Ursa Major

M101, NGC 5473-4, NGC 5477, NGC 5485-6; Ursa Major

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