Cave Nebula (SHO) (Massimo Di Fusco)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: HD216532 · HD216711 · HD216898 · HD217035 · HD217061 · HD217086 · HD217099 · HD217312 · HD217463 · LBN 527 · LBN 529 · Sh2-155

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Cave Nebula (SHO)

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Cave Nebula (SHO)

Sh2-155 (also designated Caldwell 9, Sharpless 155 or Cave Nebula) is a diffuse nebula in the constellation Cepheus, within a larger nebula complex containing emission, reflection, and dark nebulosity.
Sh2-155 is an ionized H II region with an ongoing star formation activity, at an estimated distance of 2400 light-years from Earth. It was first noted as a galactic emission nebula in 1959 in the extended second edition of the Sharpless catalogue. The name "Cave Nebula" was coined for this object by Patrick Moore, presumably derived from photographic images showing a curved arc of emission nebulosity corresponding to a cave mouth.

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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	8231686
PixInsight job	6GFV9889T5YCFUXWF718DR7P50C695UZ
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	22h56m52s.37
RA (top/left)	22h58m01s.28
RA (top/right)	22h51m07s.78
RA (bottom/right)	22h55m47s.11
RA (bottom/left)	23h02m39s.58

Dec (center)	+62°37′40″.8
Dec (top/left)	+63°17′20″.2
Dec (top/right)	+62°30′19″.3
Dec (bottom/right)	+61°58′04″.3
Dec (bottom/left)	+62°44′07″.10

Image Index:

Contribution Index (beta):

Cave Nebula (SHO)

Cave Nebula (SHO)

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Image Index:

Contribution Index (beta):

Cave Nebula (SHO)

Cave Nebula (SHO)

Equipment

Acquisition details

Description

Comments

Sky plot

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In these public groups

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