Sh2-155 The Cave Nebula (Arun H)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: PK110+01.1 · Sh2-155 · VdB155

Powered byPixInsight

Sh2-155 The Cave Nebula

Powered byPixInsight

Sh2-155 The Cave Nebula

After my last narrow band image - the Crescent - I wanted to tackle something more challenging. This is my attempt at the Cave Nebula. At 30 hours, my longest integration to date. And it needs every minute of it. In fact, the very best images of this object on Astrobin use considerably more - 50 hours in some cases and with larger apertures than mine. This one can still be improved I feel, with more OIII data.

Description adapted from Wikipedia:

Sh2-155 (also designated Caldwell 9, Sharpless 155 or S155) is a diffuse nebula in the constellation Cepheus, within a larger nebula complex containing emission, reflection, and dark nebulosity. It is widely known as the Cave Nebula. Sh2-155 is an ionized H II region with ongoing star formation activity, at an estimated distance of 725 parsecs (2400 light-years) from Earth.

Sh2-155 lies at the edge of the Cepheus B cloud (part of the Cepheus molecular cloud), and is ionized by young stars from the Cep OB3 association. It has been suggested that radiation from the hot O-type star HD 217086 is compressing the region, triggering the formation of a new generation of stars. A study of the region's young stellar objects by the Chandra X-ray Observatory and Spitzer Space Telescope shows a progression of stellar ages in front of the cloud, supporting the hypothesis of triggered star-formation.

Original
Final
B

Cloudy Nights
Suburban Astrophotography
PixInsight Addicts
Sharpless2 Objects
AstroBin Platform open discussions community forum

Please note: The following tables are updated every 24 hours.

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	3801976
PixInsight job	O05L7EANRBFNUM6HON5K0K9PWQON9RSM
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	22h57m05s.20
RA (top/left)	22h49m01s.41
RA (top/right)	23h05m13s.25
RA (bottom/right)	23h04m46s.13
RA (bottom/left)	22h49m18s.49

Dec (center)	+62°31′24″.10
Dec (top/left)	+63°12′49″.5
Dec (top/right)	+63°12′01″.1
Dec (bottom/right)	+61°48′20″.6
Dec (bottom/left)	+61°49′05″.9

Image Index:

Contribution Index (beta):

Sh2-155 The Cave Nebula

Sh2-155 The Cave Nebula

Equipment

Acquisition details

Description

Comments

Revisions

Sky plot

Histogram

In these public groups

Image Index:

Contribution Index (beta):

Sh2-155 The Cave Nebula

Sh2-155 The Cave Nebula

Equipment

Acquisition details

Description

Comments

Revisions

Sky plot

Histogram

In these public groups

Notifications

AstroBin is in READ ONLY mode

Sorry :-(

Sorry :-(

Sorry :-(

Are you really sure?

Warning!

Warning!

Are you sure?

Report abuse

Slideshow settings

IOTD/TP stats (last [x] days)

Distribution of astrophotographers

Distribution of subject types

Distribution of data sources

Sorry

Sorry

Share

Upload new revision

Upload uncompressed source (XISF/FITS/PSD/TIFF)

Delete image and all its revisions?

Delete original image?

Delete all other versions?

Delete all revisions?

Delete this revision?

IOTD/TP stats

The following people like this image

The following people bookmarked this image

Warning

Flag malfunctioning thumbnails

Contains

Remove yourself as a collaborator

Plate-solving information