NGC 6781 Planetary Nebula (Eric Coles (coles44))

Celestial hemisphere: Northern · Constellation: Aquila (Aql) · Contains: LDN 644 · NGC 6781 · PK041-02.1

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NGC 6781 Planetary Nebula

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NGC 6781 Planetary Nebula

Here is the introduction to NGC 6781 in Wikipedia. This makes this PN a bit more interesting.

"NGC 6781 is a planetary nebula located in the equatorial constellation of Aquila, about 2.5° east-northeast of the 5th magnitude star 19 Aquilae.[3] It was discovered July 30, 1788 by the Anglo-German astronomer William Herschel.[5] The nebula lies at a distance of 1,500 ly from the Sun.[2] It has a visual magnitude of 11.4 and spans an angular size of 1.9 × 1.8 arcminutes.[3]

The bipolar dust shell of this nebula is believed to be barrel-shaped and is being viewed from nearly pole-on.[6] It has an outer angular radius of 61″; equivalent to a physical radius of 0.44 ly (0.135 pc). The total mass of gas ejected as the central star passed through its last asymptotic giant branch (AGB) thermal pulse event is 0.41 M☉, while the estimated dust mass is 1.53 M☉.[2]

The magnitude 16.88 central star of the planetary nebula is a white dwarf with a spectral type of DAO. It has an M-type co-moving companion at a projected separation of under 5,000 AU.[7] The white dwarf progenitor star had an estimated initial mass of ~2.5 M☉. It left the AGB and entered the cooling stage around 9,400 years ago.[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
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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	8228059
PixInsight job	G3K4MQ9441JEEYC6LPOHJNUF7LI9DEKI
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	19h18m28s.940
RA (top/left)	19h19m31s.305
RA (top/right)	19h17m25s.100
RA (bottom/right)	19h17m24s.814
RA (bottom/left)	19h19m30s.950

Dec (center)	+06°32′18″.95
Dec (top/left)	+06°42′42″.43
Dec (top/right)	+06°42′49″.40
Dec (bottom/right)	+06°21′53″.100
Dec (bottom/left)	+06°21′48″.26

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NGC 6781 Planetary Nebula

NGC 6781 Planetary Nebula

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NGC 6781 Planetary Nebula

NGC 6781 Planetary Nebula

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