Abell 39 (Kirby Collins)

Celestial hemisphere: Northern · Constellation: Hercules (Her) · Contains: PK047+42.1

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Abell 39

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Abell 39

When stars like our sun reach the end of their lives, they shed their outer layers while the core contracts to a white dwarf. The expelled gases form one or more concentric shells which may be ionized by the remaining star, forming an emission nebula referred to as a planetary nebula. This is a misnomer...Herschel coined the term because they appeared disk-like, but they actually have nothing to do with planets.

At magnitude 12, and glowing almost entirely with the blue-green of ionized oxygen, Abell 39 was too faint to be spied by Herschel or any of his contemporaries.But with its almost perfectly spherical shape, undistorted by any nearby stars or gas clouds, it is a beautiful example of this class of objects. The nebula is roughly 7000 light years from us, and at five light years in diameter it appears 2.8 arc minutes in diameter (one tenth the width of the full moon).

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	5881700
PixInsight job	L17VR86W7UO68YHT5FA2155AISHEZP7V
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	16h27m34s.10
RA (top/left)	16h28m48s.35
RA (top/right)	16h29m06s.77
RA (bottom/right)	16h26m19s.26
RA (bottom/left)	16h26m02s.10

Dec (center)	+27°54′26″.1
Dec (top/left)	+27°27′51″.0
Dec (top/right)	+28°18′04″.8
Dec (bottom/right)	+28°20′59″.3
Dec (bottom/left)	+27°30′49″.2

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Abell 39

Abell 39

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Image Index:

Contribution Index (beta):

Abell 39

Abell 39

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