NGC7023 The Iris Nebula (Denis Janky)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: Iris Nebula · NGC 7023 · VdB139

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NGC7023 The Iris Nebula

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NGC7023 The Iris Nebula

The Iris Nebula resides in the constellation Cepheus, and is a fine visual and photographic object. It was originally discovered on October 18, 1794 by William Herschel.

This nebula is contained within our Milky Way Galaxy and is an example of a reflection nebula. It is anchored by the young, blue central star catalogued as HD200775 (or V380 Cep). The nebula is composed of dust that has remained after the formation of HD200775, and this dust is being illuminated by light from the star. The faint red filaments near the center are caused by ultraviolet radiation from the star that has ionized hydrogen gas.

The central star is very young (approximately 6400 years old), and it’s radius is estimated to be about 8.71 times that of the Sun. It has an apparent magnitude of 7.34, which is just beyond reach of naked eye visibility for most observers and sky conditions.

Distance estimates to the nebula range from 1300 to just over 1700 light years. The span of the blue region of the nebula is approximately six light years.

There is a star cluster on the west side of the nebula known as Collinder 427. It can be seen in the upper right region of this image, roughly centered within the dark ear-shaped region.

There are many splendid images of this nebula, and many are taken with small, wide field telescopes that show the full expanse of the surrounding dust cloud. The current image is a narrow field closeup, and so only exhibits the bright central region and a portion of the darker surrounding material.

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	3543158
PixInsight job	SYR906YXWNPOE52H2BML8OB3CHZB87MQ
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	21h01m35s.314
RA (top/left)	21h02m03s.356
RA (top/right)	20h59m32s.469
RA (bottom/right)	21h01m07s.728
RA (bottom/left)	21h03m38s.484

Dec (center)	+68°09′56″.76
Dec (top/left)	+68°21′13″.59
Dec (top/right)	+68°08′04″.90
Dec (bottom/right)	+67°58′39″.63
Dec (bottom/left)	+68°11′42″.91

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NGC7023 The Iris Nebula

NGC7023 The Iris Nebula

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NGC7023 The Iris Nebula

NGC7023 The Iris Nebula

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