Sh2-155 (Steve BENZ)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep)

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Sh2-155

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Sh2-155

Sh2-155 ist ein diffuser Nebel in dem Sternbild Kepheus. Er ist weithin als Höhlennebel bekannt.
Sh2-155 ist eine ionisierte H II Gebiet mit anhaltenden Sternentstehungen,mit einer geschätzten Entfernung von 725 Parsec (2400 Lichtjahre) von der Erde aus.
Sh2-155 wurde erstmals 1959 in der erweiterten zweiten Auflage des Sharpless-Katalogs als galaktischer Emissionsnebel erwähnt und ist Teil der viel größeren Cep-OB3-Assoziation. Obwohl Sh2-155 für die Beobachtung relativ schwach zu erkennen ist, kann ein Teil seiner Struktur durch ein mittelgroßes Teleskop unter dunklem Himmel visuell erkannt werden.
Sh2-155 liegt am Rande der Kepheus-B-Wolke (Teil der Kepheus-Molekülwolke) und wird von jungen Sternen aus dem Cep-OB3-Verbund ionisiert. Es wird vermutet, dass die Strahlung des heißen O-Sterns HD 217086 die Region komprimiert und die Bildung einer neuen Generation von Sternen auslöst. Eine Untersuchung der jungen stellaren Objekte in der Region durch das Chandra-Röntgenobservatorium und das Spitzer-Weltraumteleskop zeigt einen Altersverlauf der Sterne vor der Wolke, was die Hypothese der ausgelösten Sternentstehung unterstützt.

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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	Basic success
Started	...
Astrometry.net job	8524739
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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Sh2-155

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Description

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