M57 in HO-RGB (Mau_Bard)

M57 in HO-RGB

I completed the RGB image with the H-alfa and O-III signals recorded through a dual-narrow-band filter. It is the narrowband signal that included the faint external halo, that was absent from the RGB image.

*

M 57, also called Ring Nebula, or NGC 6720, is a planetary nebula in Lyra.
Planetary nebulae are formed when a star, during the last stages of its evolution before becoming a white dwarf, expels a vast luminous envelope of ionized gas into the surrounding interstellar space.

Charles Messier discovered it in January 1779. His fellow astronomer Antoine Darquier de Pellepoix later reported that it was "...as large as Jupiter and resembles a planet which is fading". This description may have contributed to the persistent and misleading "planetary nebula" terminology (planetary nebulae have nothing to do with planets).
Messier and William Herschel speculated that the nebula was formed by multiple faint stars that were unresolvable with his telescope.
In 1864, the English amateur astronomer William Huggins examined the spectra of multiple nebulae, discovering that some of these objects, including M57, displayed the spectra of bright emission lines characteristic of fluorescing glowing gases. Huggins concluded that most planetary nebulae were not composed of unresolved stars, as had been previously suspected, but were nebulosities.
The nebula was first photographed by the Hungarian astronomer Eugene von Gothard in 1886,

The central star, that originated the nebula has a current mass of about 0.61 M☉, with a surface temperature of 125,000 K. Currently it is 200 times more luminous than the Sun, and its apparent magnitude is only +15.75.

Final
Original
B

B

Title: Closeup

Uploaded: ...

Suburban Astrophotography
PixInsight Addicts
Imagers of Italy
Planetary Nebulae
Musical Imagers
Narrowband imaging
Optolong L-eXtreme filter
Broadband under Bortle 7/8/9
Duo-band, Tri-band, and Quad-band Imaging
N.I.N.A. Users
Imaged with N.I.N.A.
Light Polluted skies
Optolong L-Pro filter

	Distinct awarded users	Total awarded images
Image of the day
Top picks
Top pick nominations

	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

	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

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	6005370
PixInsight job	W9V2V0ZGRGXTP6844AXTAECDNDAR5GV2
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	18h53m35s.209
RA (top/left)	18h54m21s.719
RA (top/right)	18h52m43s.323
RA (bottom/right)	18h52m48s.827
RA (bottom/left)	18h54m26s.899

Dec (center)	+33°01′44″.27
Dec (top/left)	+33°10′45″.39
Dec (top/right)	+33°09′22″.12
Dec (bottom/right)	+32°52′41″.80
Dec (bottom/left)	+32°54′04″.80

Image Index:

Contribution Index (beta):

M57 in HO-RGB

M57 in HO-RGB

Equipment

Acquisition details

Description

Comments

Revisions

B

Sky plot

Histogram

In these public groups

		...
You have no new notifications.

Image Index:

Contribution Index (beta):

M57 in HO-RGB

M57 in HO-RGB

Equipment

Acquisition details

Description

Comments

Revisions

B

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