NGC 7023 Iris and Ghost Nebula (Justin Worden)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: HD200775 · Iris Nebula · LBN 487 · LBN 495 · LDN 1168 · LDN 1170 · LDN 1172 · LDN 1173 · LDN 1174 · LDN 1177 · NGC 7023 · Sh2-136 · T Cep · VdB141

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NGC 7023 Iris and Ghost Nebula

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NGC 7023 Iris and Ghost Nebula

The Iris Nebula (also known as NGC 7023 and Caldwell 4) is a bright reflection nebula in the constellation Cepheus. The designation NGC 7023 refers to the open cluster within the larger reflection nebula designated LBN 487. The nebula, which shines at magnitude +6.8, is illuminated by a magnitude +7.4 star designated HD 200775. It is located near the Mira-type variable star T Cephei, and near the bright magnitude +3.23 variable star Beta Cephei (Alfirk). It lies 1,300 light-years away and is six light-years across.

Observation data: J2000.0 epoch
Right ascension   21h 01m 35.60s
Declination   +68° 10′ 10.0″
Distance   1,300 ly
Apparent magnitude (V)   6.8
Apparent dimensions (V)   18' x 18'
Constellation   Cepheus

Physical characteristics
Radius   3 ly
Designations   NGC 7023 and LBN487, Caldwell 4, Cr 429
https://en.wikipedia.org/wiki/Iris_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
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	8529076
PixInsight job	G8R6MXCDJB1EJZ236Y4LK4ICWFEJ4ESX
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	21h07m24s.67
RA (top/left)	20h56m00s.52
RA (top/right)	21h18m42s.55
RA (bottom/right)	21h19m39s.26
RA (bottom/left)	20h55m16s.20

Dec (center)	+68°05′37″.1
Dec (top/left)	+67°14′16″.10
Dec (top/right)	+67°13′33″.5
Dec (bottom/right)	+68°53′43″.9
Dec (bottom/left)	+68°54′32″.4

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NGC 7023 Iris and Ghost Nebula

NGC 7023 Iris and Ghost Nebula

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NGC 7023 Iris and Ghost Nebula

NGC 7023 Iris and Ghost Nebula

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