SH2-155 (Cave Nebula) (Alex Woronow)

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

Powered byPixInsight

SH2-155 (Cave Nebula)

Powered byPixInsight

SH2-155 (Cave Nebula)

SH2-155 Cave Nebula

OTA: Star Fire (175mm f/8)

Camera: FLI PL-16070AE

Observatory: Deep Sky West

EXPOSURES:

Red: 32 x 900 sec

Blue: 17 x 900

Green: 20 x 900

Luminosity: 23 x 900

Total exposure = 23 hours

Image Width: ~1.5 deg (North is to the right)

Processed by Alex Woronow in 2018 using PixInsight, StarNet++, Matlab (LRGB stacks by Lloyd at DSW)

(Source: largely Wikipedia )

The Cave Nebula, a molecular cloud, lies at a distance of about 2400 light-years, in the constellation of Cepheus. This nebula is a complex of dark nebulae and bright emission nebula and is an active star-formation site. The outer edge of the crescent is illuminated by several massive OB stars. OB stars are short lived, and therefore seldom move very far from where their birth place before they expire. They emit much ultraviolet radiation, which stimulates the Ha emissions in the cloud, and, perhaps compresses it to stimulate further star-birth.

Although Sh2-155 is relatively faint for amateur observation, some of its structure may be seen visually through a moderately sized telescope under dark skies.

The refractors!

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	2751683
PixInsight job	OLNT8EHT6CO8CY36YXWVVOR1IS27B0WD
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	22h56m43s.47
RA (top/left)	23h00m52s.78
RA (top/right)	23h00m48s.24
RA (bottom/right)	22h52m21s.90
RA (bottom/left)	22h52m50s.33

Dec (center)	+62°37′11″.5
Dec (top/left)	+61°54′49″.4
Dec (top/right)	+63°20′20″.6
Dec (bottom/right)	+63°19′02″.6
Dec (bottom/left)	+61°53′40″.6

Image Index:

Contribution Index (beta):

SH2-155 (Cave Nebula)

SH2-155 (Cave Nebula)

Equipment

Acquisition details

Description

Comments

Acquired at

Sky plot

Histogram

In these public groups

		...
You have no new notifications.

Image Index:

Contribution Index (beta):

SH2-155 (Cave Nebula)

SH2-155 (Cave Nebula)

Equipment

Acquisition details

Description

Comments

Acquired at

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?

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