The Pinwheel Galaxy – Messier 101 (M101 or NGC 5457) (Tom Wildoner)

Celestial hemisphere: Northern · Constellation: Ursa Major (UMa) · Contains: HD122865 · M 101 · 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 · Pinwheel galaxy

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The Pinwheel Galaxy – Messier 101 (M101 or NGC 5457)

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The Pinwheel Galaxy – Messier 101 (M101 or NGC 5457)

The Pinwheel Galaxy (also known as Messier 101, M101 or NGC 5457) is a face-on spiral galaxy 21 million light-years (6.4 megaparsecs) away from Earth in the constellation Ursa Major. M101 is a large galaxy, with a diameter of 170,000 light-years. By comparison, the Milky Way has a diameter of between 100,000 and 120,000 light-years. It has around a trillion stars.

Observation data (J2000 epoch)
Constellation: Ursa Major
Right ascension: 14h 03m 12.6s
Declination: +54° 20′ 57″
Distance: 20.9 ± 1.8 Mly
Apparent magnitude (V): 7.9

Tech Specs: Sky-Watcher Esprit 120ED Telescope, ZWO AS2600mc-Pro running at -10C, Celestron CGEM-DX mount, 66 x 60 second guided exposures, focused with a ZWO EAF, controlled with a ZWO ASIAir Pro. Processed using DSS and PixInsight. Image Date: January 16, 2023. Location: The Dark Side Observatory (W59), Weatherly, PA, USA (Bortle Class 4).

Messier Objects

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Distribution of astrophotographers

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	Distinct awarded users	Total awarded images
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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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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
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Professional, scientific grade data
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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	7149240
PixInsight job	SQ105CRALRD0Z3MBW3JGGXZTP4LAO32F
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	14h03m01s.844
RA (top/left)	13h57m49s.225
RA (top/right)	14h01m23s.435
RA (bottom/right)	14h08m07s.515
RA (bottom/left)	14h04m46s.402

Dec (center)	+54°21′42″.75
Dec (top/left)	+54°55′39″.95
Dec (top/right)	+53°27′04″.76
Dec (bottom/right)	+53°47′10″.82
Dec (bottom/left)	+55°16′05″.90

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The Pinwheel Galaxy – Messier 101 (M101 or NGC 5457)

The Pinwheel Galaxy – Messier 101 (M101 or NGC 5457)

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Image Index:

Contribution Index (beta):

The Pinwheel Galaxy – Messier 101 (M101 or NGC 5457)

The Pinwheel Galaxy – Messier 101 (M101 or NGC 5457)

Equipment

Acquisition details

Description

Comments

Sky plot

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