Cave Nebula (Sh2-155) (rhedden)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep)

Powered byPixInsight

Cave Nebula (Sh2-155)

Powered byPixInsight

Cave Nebula (Sh2-155)

The Cave nebula (Sharpless 2-155) is an interesting region in the constellation Cepheus that exhibits both hydrogen-alpha emission and reflection nebulae. In order to capture both, a synthetic luminance was created that combines hydrogen-alpha with broadband luminance. Although I was not able to travel to a dark site to work on this image, some really good weather helped the quality of the data.

One of the interesting features in this image is the small, dark nebula at the left side of the image. It reminds me very much of the lowercase Greek letter Xi. Does anybody know if it has a name?

Edit 9/2/20: there was just a little bit of unwanted green tint lurking in the darker areas, which I found after turning all the lights off.... I hate it when that happens! The revision has been de-greened.

Original
B
Final
C

C

Description: This revision has better noise reduction (Topaz AI), diminished halos around the stars, and a different method of combining Ha and luminance. I thought this was one of my best images when I first processed it, but after re-working it, the previous version looks like garbage! Now it just needs 20 more hours of integration this coming summer.

Uploaded: ...

AstroBin Platform open discussions community forum
Northeast Imagers
The refractors!
Cloudy Nights
N.I.N.A. Users
Gimp Processing
Skywatcher Esprit ED Super APO Triplet
Musical Imagers

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	Basic success
Started	...
Astrometry.net job	4242273
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

Image Index:

Contribution Index (beta):

Cave Nebula (Sh2-155)

Cave Nebula (Sh2-155)

Equipment

Acquisition details

Description

Comments

Revisions

C

Sky plot

Histogram

In these public groups

		...
You have no new notifications.

Image Index:

Contribution Index (beta):

Cave Nebula (Sh2-155)

Cave Nebula (Sh2-155)

Equipment

Acquisition details

Description

Comments

Revisions

C

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?

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