M101 - Pinwheel Galaxy (David Grant)

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 · Pinwheel galaxy

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M101 - Pinwheel Galaxy

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M101 - Pinwheel Galaxy

M101 is a beautiful face-on spiral galaxy located 21 million light years from Earth. It's roughly 1.7x larger than the Milky Way, and contains an estimated one trillion stars. M101 has a large number of hydrogen alpha regions, which is where all the pink and red spots come from. The galaxies asymmetrical shape is caused by the gravity from nearby galaxies pulling on it. This pulling causes hydrogen gases to compress, triggering really strong star formation within the galaxy, even more so within the spiral arms.

Shooting at f/10 it's less than ideal. A mixture of slow speed and long focal length is a recipe for disaster. This image is over 40 hours of total integration time, but I also had to throw away roughly half of my total images. I was able to capture the HA regions using a narrowband filter, extracting the HA data and blending it into my RGB data.

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	Advanced success
Started	...
Astrometry.net job	5694853
PixInsight job	1VTL43TA0ZSQRUTEDVZD2HNFSJEAIVDT
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	14h03m11s.355
RA (top/left)	14h02m34s.252
RA (top/right)	14h01m34s.388
RA (bottom/right)	14h03m47s.884
RA (bottom/left)	14h04m49s.132

Dec (center)	+54°22′08″.12
Dec (top/left)	+54°39′25″.38
Dec (top/right)	+54°10′50″.37
Dec (bottom/right)	+54°04′48″.22
Dec (bottom/left)	+54°33′18″.71

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M101 - Pinwheel Galaxy

M101 - Pinwheel Galaxy

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M101 - Pinwheel Galaxy

M101 - Pinwheel Galaxy

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