The Iris Nebula (NGC 7023) in Cepheus (Tom Wildoner)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: HD200775 · Iris Nebula · LBN 487 · LDN 1168 · LDN 1170 · LDN 1172 · LDN 1173 · LDN 1174 · NGC 7023

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The Iris Nebula (NGC 7023) in Cepheus

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The Iris Nebula (NGC 7023) in Cepheus

The Iris Nebula (also known as NGC 7023 and Caldwell 4) is a bright reflection nebula in the constellation Cepheus. It is located about 1,300 light-years from Earth and is about six light-years across. The nebula is illuminated by a young star called SAO 19158. The Iris Nebula is named for its resemblance to an iris flower. The nebula's blue color is caused by the scattering of starlight by dust grains. The dust grains are very small, about 10 times smaller than dust particles on Earth. The nebula's red filaments are caused by the presence of carbon monoxide molecules.

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

Tech Specs: Sky-Watcher Esprit 120ED Telescope, ZWO ASI2600MC camera running at -10F, 216 x 60 seconds guided exposures, Sky-Watcher EQ6R-Pro mount, ZWO EAF and ASIAir Pro, processed in DSS and PixInsight. Image Date: November 23, 2022. Location: The Dark Side Observatory (W59), Weatherly, PA, USA (Bortle Class 4).

The refractors!

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	Distinct awarded users	Total awarded images
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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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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	7744164
PixInsight job	2KST1WOEK08OZTF70DLJTPDQBHFD9ATM
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	21h01m43s.877
RA (top/left)	21h06m56s.868
RA (top/right)	21h07m45s.177
RA (bottom/right)	20h56m05s.919
RA (bottom/left)	20h56m05s.860

Dec (center)	+68°07′48″.58
Dec (top/left)	+67°19′53″.37
Dec (top/right)	+68°53′35″.99
Dec (bottom/right)	+68°55′12″.52
Dec (bottom/left)	+67°21′13″.79

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The Iris Nebula (NGC 7023) in Cepheus

The Iris Nebula (NGC 7023) in Cepheus

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Image Index:

Contribution Index (beta):

The Iris Nebula (NGC 7023) in Cepheus

The Iris Nebula (NGC 7023) in Cepheus

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