M101 - The Pinwheel Galaxy (Andrew Barton)

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 · Pinwheel galaxy

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M101 - The Pinwheel Galaxy

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M101 - The Pinwheel Galaxy

M101 is large spiral galaxy 170,000 light years in diameter and is located 21 million light years away. It's almost twice as big as the Milky Way at 100,000 light years in diameter and has twice the number of stars in the Milky Way. It does not appear to have a supermassive black hole at its core based on radio and x-ray emissions.

For this image I decided to attempt to enhance RGB data with Ha and OIII data. My goal was to emphasize the HII star framing regions and bring out the faint spiral arms. I used StarNet++ to remove the stars from the Ha and OIII stacks and used the PixInsight NBRGB Combination script to handle the blending of this data into the RGB data. I used a light tough on the enhancement using Ha to augment the red channel and OIII to augment the blue channel.

Acquisition Details:

Nights 4-26-2020 and 4-27-2020

Grain 75, temp -10C

Red: 71 x 240 sec

Green: 71 x 240 sec

Blue: 71 x 240 sec

Nights 4-28-2020 and 4-29-2020

Gain 139, temp -10C

Ha: 68 x 360 sec

OIII: 49 x 360 sec

Arizona Astrophotographers
ZWO ASI1600MM/QHY163M

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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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Star trails
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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
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	3655514
PixInsight job	KBCM9SHEC8YXO1WZ1I1AUOPI0838OAUT
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	14h03m16s.299
RA (top/left)	14h04m40s.451
RA (top/right)	14h05m01s.200
RA (bottom/right)	14h01m50s.897
RA (bottom/left)	14h01m32s.846

Dec (center)	+54°21′59″.99
Dec (top/left)	+54°04′27″.62
Dec (top/right)	+54°37′05″.46
Dec (bottom/right)	+54°39′27″.83
Dec (bottom/left)	+54°06′49″.17

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M101 - The Pinwheel Galaxy

M101 - The Pinwheel Galaxy

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M101 - The Pinwheel Galaxy

M101 - The Pinwheel Galaxy

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