CTB1 - Supernova Remnant - APOD 2023-04-24 (SpacePaparazzi)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: 9 Cas · HD224055 · HD224403 · HD224892 · HD225160 · LBN 576 · The star 9 Cas

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CTB1 - Supernova Remnant - APOD 2023-04-24

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CTB1 - Supernova Remnant - APOD 2023-04-24

APOD: 2023 April 24 – The Medulla Nebula Supernova Remnant (nasa.gov)

What powers this unusual nebula? CTB-1 is the expanding gas shell that was left when a massive star toward the constellation of Cassiopeia exploded about 10,000 years ago. The star likely detonated when it ran out of elements near its core that could create stabilizing pressure with nuclear fusion. The resulting supernova remnant, nicknamed the Medulla Nebula for its brain-like shape, still glows in visible light by the heat generated by its collision with confining interstellar gas. Why the nebula also glows in X-ray light, though, remains a mystery. One hypothesis holds that an energetic pulsar was co-created that powers the nebula with a fast outwardly moving wind. Following this lead, a pulsar has recently been found in radio waves that appears to have been expelled by the supernova explosion at over 1000 kilometers per second. Although the Medulla Nebula appears as large as a full moon, it is so faint that it took many hours of exposure with a telescope in Seven Persons, Alberta, Canada to create the featured image.

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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.
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	8647186
PixInsight job	PAHLEMBWVZZV6MD56RV337SH3NCEHU90
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	23h59m14s.790
RA (top/left)	00h04m50s.467
RA (top/right)	23h52m07s.314
RA (bottom/right)	23h53m52s.508
RA (bottom/left)	00h06m12s.505

Dec (center)	+62°26′17″.56
Dec (top/left)	+63°03′00″.94
Dec (top/right)	+62°46′30″.83
Dec (bottom/right)	+61°48′45″.98
Dec (bottom/left)	+62°04′43″.58

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CTB1 - Supernova Remnant - APOD 2023-04-24

CTB1 - Supernova Remnant - APOD 2023-04-24

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CTB1 - Supernova Remnant - APOD 2023-04-24

CTB1 - Supernova Remnant - APOD 2023-04-24

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