NGC 7023 - Iris Nebula (Darius Kopriva)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: HD198385 · HD198737 · HD200099 · HD200775 · Iris Nebula · LBN 468 · LBN 475 · LBN 483 · LBN 487 · LBN 495 · LDN 1147 · LDN 1148 · LDN 1155 · LDN 1158 · LDN 1167 · LDN 1168 · LDN 1170 · LDN 1171 · LDN 1172 · LDN 1173 · LDN 1174 · LDN 1177 · NGC 7023 · Sh2-136 · T Cep · VdB141

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NGC 7023 - Iris Nebula

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NGC 7023 - Iris 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 SAO 19158. 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

Outside of the reflection nebula, which is illuminated blue by the star, there are other nebulae, some faintly glowing, some made of dark interstellar dust. They are particularly noticeable because the apparent star density is lower there. The nebula is an active star-forming region. Measurements by the Gaia probe gave a distance of 335 ± 11 pc (1093 ± 36 light years). The open star cluster is about 10 arc minutes in diameter, which is about three light-years at this distance. The reflection nebula is about twice as large.

Southern Hemisphere Astro

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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
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	Image of the day	Top pick	Top pick nominations	Total submitted
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	Image of the day	Top pick	Top pick nominations	Total submitted
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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	6019345
PixInsight job	L2COIKV8HLG2VFMF9KKPZYDMG79YSIR4
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	21h01m24s.43
RA (top/left)	21h25m30s.47
RA (top/right)	20h39m25s.43
RA (bottom/right)	20h39m41s.25
RA (bottom/left)	21h20m40s.80

Dec (center)	+68°10′24″.3
Dec (top/left)	+69°15′21″.2
Dec (top/right)	+69°36′10″.4
Dec (bottom/right)	+66°53′30″.5
Dec (bottom/left)	+66°34′51″.4

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NGC 7023 - Iris Nebula

NGC 7023 - Iris Nebula

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NGC 7023 - Iris Nebula

NGC 7023 - Iris Nebula

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