Abell 35 (Daniel Stern)

Celestial hemisphere: Southern · Constellation: Hydra (Hya) · Contains: HD111865 · HD112039 · PK303+40.1 · Sh2-313

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Abell 35

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Abell 35

This is Abell 35 which, up until recently, was thought to be a planetary nebula. A planetary nebula is an emission nebula formed when a dying star sheds its outer layers. Abell 35 has some unusual properties that called into question its planetary nebula classification. In the center of the image there is a teal-colored parabolic bow-shock wave structure with a bright star at its tip. Scientists determined that that star was of a type that was not hot enough to ionize the nebula (that’s what would make it a planetary nebula). It was eventually determined that Abell 35 was formed from a binary pair of stars and that the wind from those stars formed the bow-shock feature. Abell 35 is moving through space at 10 times the speed of sound giving rise to a shock wave that created the linear structures shown in the image.

Abell Planetary Nebula

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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
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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	8263932
PixInsight job	ZV5V6S4P71S7R0VZXJDIFNI7Q2DQP089
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	12h53m32s.561
RA (top/left)	12h52m09s.746
RA (top/right)	12h54m55s.831
RA (bottom/right)	12h54m55s.220
RA (bottom/left)	12h52m09s.781

Dec (center)	-22°52′05″.56
Dec (top/left)	-23°11′11″.72
Dec (top/right)	-23°11′06″.34
Dec (bottom/right)	-22°32′56″.54
Dec (bottom/left)	-22°33′02″.16

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Abell 35

Abell 35

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Abell 35

Abell 35

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