The Iris of Cepheus (Monty Chandler)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: HD200775 · Iris Nebula · LBN 487 · LDN 1174 · NGC 7023

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The Iris of Cepheus

Link: https://montychandler.smugmug.com/Astrophotography/Nebula/i-Ff6ktrS/A

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The Iris of Cepheus

Link: https://montychandler.smugmug.com/Astrophotography/Nebula/i-Ff6ktrS/A

The Iris Nebula (also known as NGC 7023 and Caldwell 4) is a bright reflection nebula in the constellation Cepheus.

A reflection nebula is one whose light comes from a bright star that reflects nearby dust. The Iris Nebula is one of many nebulae in the night sky with a floral common name.

An interesting characteristic of this object is the intense interstellar dust that surrounds NGC 7023, clearly blocking out the stars behind it.

NGC 7023 is actually the star cluster within the nebula, but the cluster and the reflection nebula are referenced as the same. The nebula gets its trademark glowing blue appearance thanks to SAO 19158, the star responsible for lighting the entire region up.

My photo was captured from my Bortle Scale class 4 backyard in a forest, using a L-Pro filter on my astronomy camera(ZWO ASI071MC Pro). The focal length of the telescope used was 1625mm (GSO RC8), which is wide enough to reveal some of the surrounding dust in Cepheus.

The image was made using 327 x 4-minute exposures (1308 minutes total). When photographing the Iris Nebula, it is important to record the soft dusty areas that block starlight in the area. .

It lies 1,300 light-years away and is six light-years across.

Please note: The following tables are updated every 24 hours.

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	Advanced success
Started	...
Astrometry.net job	8348650
PixInsight job	PHAD7TMZHL7ZO4X55PKDIK00JLITGTFI
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	21h01m49s.929
RA (top/left)	21h04m41s.804
RA (top/right)	21h04m28s.605
RA (bottom/right)	20h58m52s.355
RA (bottom/left)	20h59m16s.455

Dec (center)	+68°12′49″.60
Dec (top/left)	+67°49′41″.24
Dec (top/right)	+68°36′55″.00
Dec (bottom/right)	+68°35′45″.40
Dec (bottom/left)	+67°48′33″.25

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The Iris of Cepheus

The Iris of Cepheus

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The Iris of Cepheus

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