Sh 2-91 - L'autre rémanent du Cygne (Francis Moreau)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: 12 Cyg · 12 phi Cyg · 9 Cyg · HD183930 · HD183971 · HD184150 · HD184589 · HD184719 · HD184738 · HD184907 · HD185268 · HD185332 · HD185735 · HD185755 · HD185756 · HD332364 · HD332365 · HD332369 · HD332380 · HD332381 · HD332383 · HD332384 · HD332385 · HD332386 · HD332387 · HD332388 · HD332390 · HD332391 · HD332400 · HD332403 · And 7 more.

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Sh 2-91 - L'autre rémanent du Cygne

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Sh 2-91 - L'autre rémanent du Cygne

Sh 2-91 is the oldest supernova remnant visible in amateur instrument.
Estimates range from 240,000 to 470,000 years. By compare, the Cygnus Loop is a tyke at 5,000–8,000 years old; the Vela SNR is 11,000–12,300 yro; and Simeis 147 in Taurus is ~40,000 yro.

Sh 2-91 est le plus vieux rémanent de supernova visible avec un instrument d'amateur.
Les estimations vont de 240 000 à 470 000 ans. À titre de comparaison, la boucle du Cygne est un enfant de 5 000 à 8 000 ans, le rémanent des Voiles entre 11 000 et 12 300 ans et le Simeis 147 dans le Taureau a environ 40 000 ans.

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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
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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
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Extremely wide field
Star trails
Northern lights
Noctilucent clouds
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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
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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	5971108
PixInsight job	1Q0RDVTQCTRBH271FJ213J3C0V1K77KG
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	19h35m21s.94
RA (top/left)	19h42m10s.88
RA (top/right)	19h31m09s.59
RA (bottom/right)	19h28m35s.37
RA (bottom/left)	19h39m27s.73

Dec (center)	+29°58′32″.7
Dec (top/left)	+30°18′26″.3
Dec (top/right)	+31°11′13″.3
Dec (bottom/right)	+29°37′14″.4
Dec (bottom/left)	+28°45′22″.7

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Sh 2-91 - L'autre rémanent du Cygne

Sh 2-91 - L'autre rémanent du Cygne

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Sh 2-91 - L'autre rémanent du Cygne

Sh 2-91 - L'autre rémanent du Cygne

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