Abell 39 (Scott A)

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

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Abell 39

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Abell 39

Abell 39 is a low surface brightness planetary nebula in the constellation of Hercules.

It is estimated to be about 3,300 light-years from earth and 4,600 light-years above the Galactic plane. It is almost perfectly spherical and also one of the largest known spheres with a radius of about 1.3 light-years.

Its central star is slightly west of center by about 2″ or 0.1 light-years. This offset does not appear to be due to interaction with the interstellar medium, but instead, it is hypothesized that a small asymmetric mass ejection has accelerated the central star. The mass of the central star is estimated to be about 0.61 M with the material in the planetary nebula comprising an additional 0.6 M.

This planetary nebula has been expanding for an estimated 22,100 years. Oxygen is only about half as abundant in the nebula as it is in our own sun." - wiki

This was captured from my backyard on 19-20 July 2022.

Cloudy Nights

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	6029456
PixInsight job	H7AMWXLGBTCDBWJY0F3CPD82OR7SHC9S
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	16h27m30s.596
RA (top/left)	16h26m25s.880
RA (top/right)	16h26m26s.553
RA (bottom/right)	16h28m35s.781
RA (bottom/left)	16h28m34s.819

Dec (center)	+27°54′43″.90
Dec (top/left)	+28°08′45″.64
Dec (top/right)	+27°40′27″.65
Dec (bottom/right)	+27°40′41″.40
Dec (bottom/left)	+28°09′00″.72

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Abell 39

Abell 39

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Contribution Index (beta):

Abell 39

Abell 39

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