LDN 688 & 694 (B142 & B143) - LRGB (Michael J. Mangieri)

Celestial hemisphere: Northern · Constellation: Aquila (Aql) · Contains: 50 gam Aql · B142 · B143 · LDN 687 · LDN 688 · LDN 689 · LDN 690 · LDN 694 · LDN 695 · LDN 700 · Tarazed · The star Tarazed (γAql)

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LDN 688 & 694 (B142 & B143) - LRGB

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LDN 688 & 694 (B142 & B143) - LRGB

LDN 688 & 694 (B142 & B143), collectively known as Barnard's 'E' nebula, gets it's name from the distinctive 'E' shape of the dark nebula that obscures the dense background of stars. The pair is also known as the Triple Cave Nebula. Although it appears that the two nebula are part of the same structure, they are, in fact, two distinct objects. It is our brain that wants to combine them into a familiar symbol, and so it appears as a single object.

The bright star to the left is Gamma Aquilae (Tarazed). Gamma Aquilae is a relatively young star with an age of about 270 million years, estimated to be 3.5 times the mass of the Sun and about 92 times the Sun's radius. Shining at over 2100 times the luminosity of the Sun this K-type star glows with an orange hue.

Original
Final
B

B

Description: After uploading the initial image I realized that Tarazed wasn't showing orange. Oops. I messed up the color calibration. This revision fixes that.

Uploaded: ...

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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
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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	5082701
PixInsight job	XTVSWVWTPB6T7N4USBKWV2GGNRDS0PKT
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	19h42m14s.54
RA (top/left)	19h47m11s.80
RA (top/right)	19h38m00s.49
RA (bottom/right)	19h37m19s.16
RA (bottom/left)	19h46m27s.00

Dec (center)	+10°49′01″.10
Dec (top/left)	+11°25′30″.4
Dec (top/right)	+11°41′26″.2
Dec (bottom/right)	+10°12′14″.8
Dec (bottom/left)	+09°56′24″.7

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Contribution Index (beta):

LDN 688 & 694 (B142 & B143) - LRGB

LDN 688 & 694 (B142 & B143) - LRGB

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Image Index:

Contribution Index (beta):

LDN 688 & 694 (B142 & B143) - LRGB

LDN 688 & 694 (B142 & B143) - LRGB

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