Large, Faint PN G221.5 + 46.3 in Leo (M.J. Post)

Celestial hemisphere: Northern · Constellation: Leo (Leo)

Large, Faint PN G221.5 + 46.3 in Leo, M.J. Post

Powered byPixInsight

Large, Faint PN G221.5 + 46.3 in Leo

Powered byPixInsight

Large, Faint PN G221.5 + 46.3 in Leo

I measure this planetary nebula to have a diameter of about 14 arc min, although other sources have it slightly smaller (12 arc min). Nonetheless, its large size points to an old age and explains its diminished brightness. It was discovered in 1978 and has been studied extensively by various science teams using the Hubble and Spitzer Space Telescopes. The central white dwarf progenitor star is extremely hot (85,000K) and the system's nucleus has been described as "enigmatic". It seems there must be a small, low-luminosity companion star which has captured some of the original "wind" from the progenitor, now ionized by the white dwarf. To me, this PN displays unusual structure in both its H-alpha and OIII emissions, even though the overall structure nicely fits the classical spherical model for a companionless progenitor star. This HOO rendition is false-color, but the PN's true colors are well approximated.

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	9669573
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

Image Index:

Contribution Index (beta):

Large, Faint PN G221.5 + 46.3 in Leo

Large, Faint PN G221.5 + 46.3 in Leo

Equipment

Acquisition details

Description

Comments

Sky plot

Histogram

		...
You have no new notifications.

Image Index:

Contribution Index (beta):

Large, Faint PN G221.5 + 46.3 in Leo

Large, Faint PN G221.5 + 46.3 in Leo

Equipment

Acquisition details

Description

Comments

Sky plot

Histogram

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