M101 in LRGB (Marc Mantha)

Celestial hemisphere: Northern · Constellation: Ursa Major (UMa) · Contains: HD122007 · HD122149 · HD122200 · HD122471 · HD122545 · HD122865 · HD123518 · M 101 · NGC 5422 · NGC 5443 · 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 5475 · NGC 5477 · NGC 5484 · NGC 5485 · NGC 5486 · Pinwheel galaxy

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M101 in LRGB

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M101 in LRGB

I finally had a stretch of 4 clear nights with no bright moon in the way! I don't even remember when was the last time that this happened. I decided to try M101 with my mono camera. Since I live in the city, I opted for short exposures (60s). I have a little over 17h of usable data that I captured. Sorting the subs and stacking took a while, but the end result is really worth it. Plus, I finally produced an image in which I like the stars colors and saturation. Their might be a bit too much green, but I'll keep it like this for now. I read that there are a lot of H II regions in this galaxy, I am tempted to try and narrowband Ha data in the future.

A bit of detail on the target:

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. It has a disk mass on the order of 100 billion solar masses, along with a small central bulge of about 3 billion solar masses. Its characteristics can be compared to those of Andromeda Galaxy.

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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.
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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	7558353
PixInsight job	YKOAP9DEYA3Q4IXVSM4JKS5R8BIK1V81
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	14h03m10s.77
RA (top/left)	13h56m05s.76
RA (top/right)	13h57m28s.53
RA (bottom/right)	14h09m46s.59
RA (bottom/left)	14h09m18s.18

Dec (center)	+54°20′56″.7
Dec (top/left)	+55°46′18″.2
Dec (top/right)	+52°49′13″.6
Dec (bottom/right)	+52°54′01″.2
Dec (bottom/left)	+55°51′41″.3

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M101 in LRGB

M101 in LRGB

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Image Index:

Contribution Index (beta):

M101 in LRGB

M101 in LRGB

Equipment

Acquisition details

Description

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Sky plot

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