M101 - Pinwheel Galaxy (Brad)

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

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M101 - Pinwheel Galaxy

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M101 - Pinwheel Galaxy

Messier 101 was discovered by Pierre Mechain in 1781, and Charles Messier added it as one of the last entries to his catalog later that year. Méchain described M 101 as a "nebula without star, very obscure and pretty large, 6' to 7' in diameter, between the left hand of Bootes and the tail of the great Bear."

William Herschel noted in 1784 that "[M101] in my 7, 10, and 20-feet reflectors shewed a mottled kind of nebulosity, which I shall call resolvable; so that I expect my present telescope will, perhaps, render the stars visible of which I suppose them to be composed."

M 101 was one of the first "spiral nebulae" identified by William Parsons, the third Earl of Rosse. Lord Rosse observed M 101 in his 72-inch Newtonian reflector in 1851, and made several sketches; he was the first to note its spiral structure.

Halton Arp included M 101 as No. 26 in his Catalogue of Peculiar Galaxies, with the description "Spiral with One Heavy Arm."

Ritchey Chretien telescopes GSO Family

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	Distinct awarded users	Total awarded images
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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	2686610
PixInsight job	4ER5I0NPV9V7Q9ZR75WFCX8ALDGXHR25
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	14h03m14s.20
RA (top/left)	14h05m47s.45
RA (top/right)	14h05m42s.32
RA (bottom/right)	14h00m37s.30
RA (bottom/left)	14h00m49s.56

Dec (center)	+54°20′58″.6
Dec (top/left)	+53°51′53″.1
Dec (top/right)	+54°50′50″.1
Dec (bottom/right)	+54°49′51″.3
Dec (bottom/left)	+53°50′55″.3

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M101 - Pinwheel Galaxy

M101 - Pinwheel Galaxy

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M101 - Pinwheel Galaxy

M101 - Pinwheel Galaxy

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