NGC 6781 (Tom Harrison)

Celestial hemisphere: Northern · Constellation: Aquila (Aql) · Contains: NGC 6781

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NGC 6781

Link: http://www.manoprietoobservatory.com/gallery/nebulae/165

NGC6781 is a planetary nebula seen in the direction of the Constellation Aquila a few thousand Light-Years distant near the Milky Way. The nebula was formed by expanding shells of gas ejected by the central (now) blue/white white dwarf star during its latter stages of life. The expanding shells of gas floresce from the ultraviolet radiation of the magnitude 15.5 central star which is very hot and dense, forming a beautiful circular gas bubble with lobes on the north and south sides, which is approximately 2 Light-Years across. Eventually, the white dwarf star will cool down and fade.

Object: NGC6781

Distance: A couple of thousend Light-Years

Magnitude: 12.5

Date: August 2010

Place: Fort Davis, Texas

Exposure Details: LRGB:480:180:180:260 unbinned

Processing: MaxIm DL, CCDStack, Photoshop CS3

Optics: 12.5" RCOS Truss

Focal Length: 2808mm @ f9

Mount: Paramount ME GEM Robotic

Camera: SBIG STL6303E

Focuser: RCOS

Guiding: Off-Axis with SBIG Guide Camera

Filters: Tru-Balance LRGB Gen II 2"

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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
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	6739424
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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