NGC 7822 (George Simon)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: NGC 7822

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NGC 7822

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NGC 7822

NGC 7822 is an emission nebula located about 3,000 light years away near the edge of a large molecular cloud in the constellation Cepheus. Ensconced within the nebula is the very young (a few million years old) open cluster Berkeley 59, which can be seen in my image just above and to the left of the dark nebulosity which is roughly at the center of the image.

NGC 7822 contains several O-class stars that are helping to set it aglow, but the bulk of the energy that is the source of the nebula's illumination is coming from a single behemoth star: BD+66 1673. This O5 class star has a temperature of 45,000º C and a luminosity 100,000 times greater than the Sun's. Moreover, it is an eclipsing binary, whose B-class companion is itself no slouch in the luminosity department. BD+66 1673 is the star with small diffraction spikes slightly to the left and above Berkeley 59, on the edge of a ribbon of dark nebulosity that intrudes into the upper portion of NGC 7822. This star, along with its O-class companions, is responsible for sculpting out the three-dimensional structures (including pillars and elephant trunks) that can be seen throughout the nebula. To be sure, BD+66 1673 is not even close to being the brightest star in the image. It is likely being obscured by intervening dust. Most of the stars that do appear brighter are, in fact, foreground stars that are closer to us than NGC 7822.

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	Distinct awarded users	Total awarded images
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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
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	Image of the day	Top pick	Top pick nominations	Total submitted
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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	Basic success
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Astrometry.net job	8363285
PixInsight job	n/a
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NGC 7822

NGC 7822

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NGC 7822

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