SH2-274 ( Abell 21) - The Medusa Nebula (Almos Balasi)

Celestial hemisphere: Northern · Constellation: Gemini (Gem) · Contains: NGC 2395 · Sh2-274

Powered byPixInsight

SH2-274 ( Abell 21) - The Medusa Nebula

Powered byPixInsight

SH2-274 ( Abell 21) - The Medusa Nebula

The Medusa Nebula is a planetary nebula in the constellation of Gemini. It is also known as Abell 21 and Sharpless 2-274. It was originally discovered in 1955 by University of California, Los Angeles astronomer George O. Abell, who classified it as an old planetary nebula. Until the early 1970s, the nebula was thought to be a supernova remnant. With the computation of expansion velocities and the thermal character of the radio emission, Soviet astronomers in 1971 concluded that it was most likely a planetary nebula. As the nebula is so large, its surface brightness is very low, with surface magnitudes of between +15.99 and +25 reported. The central star of the planetary nebula is an PG 1159 star. (from Wikipedia)

Sharpless2 Objects
ZWO ASI 2600MC PRO
Images from the EdgeHD Series
Schmidt-Cassegrain Telescope (SCT) Imagers
N.I.N.A. Users
Gothard Group (Magyarok/Hungarians)
The OSC Club (One Shot Camera)
CMOS Imagers
ZWO ASIAIR PRO USERS

DeepSky

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	5633970
PixInsight job	MO58ROKRPXDXRZM9DWB3196HRYCTAQ3H
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	07h29m03s.900
RA (top/left)	07h26m37s.701
RA (top/right)	07h26m40s.223
RA (bottom/right)	07h31m29s.930
RA (bottom/left)	07h31m25s.206

Dec (center)	+13°15′00″.83
Dec (top/left)	+12°40′17″.10
Dec (top/right)	+13°50′23″.79
Dec (bottom/right)	+13°49′39″.16
Dec (bottom/left)	+12°39′31″.25

Image Index:

Contribution Index (beta):

SH2-274 ( Abell 21) - The Medusa Nebula

SH2-274 ( Abell 21) - The Medusa Nebula

Equipment

Acquisition details

Description

Comments

Sky plot

Histogram

In these public groups

In these collections

		...
You have no new notifications.

Image Index:

Contribution Index (beta):

SH2-274 ( Abell 21) - The Medusa Nebula

SH2-274 ( Abell 21) - The Medusa Nebula

Equipment

Acquisition details

Description

Comments

Sky plot

Histogram

In these public groups

In these collections

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