Sh2-155 (Annehouw)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep)

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Sh2-155

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Sh2-155

This is an interesting area in the constellation Cepheus with some nice colorful sections:

Top left: Sh2-155, the cave nebula. This is a HII emission area, with gas are ionized by ultraviolet light from hot young stars, the Cepheus OB3 association.

Bottom right: The blue reflection nebula vdB155 (also catalogued as LBN 524).

Bottom centre: Star forming region CEPHEUS A. The big orange patch is HH 168, while HH 169 is the orange area a bit to the left and a much smaller area (HH 174) a bit further to the left.

In these Herbig Haro regions narrow jets of partially ionized gas from newborn stars shock the gas surrounding them, causing emission (primarily in IR).

First light of the imaging season (approx 2 hours of darkness per night).

This is the second image where PixInsight was part of the processing chain. APP is still my pre-processing champion. PI has a nice set of tools to play with (altough processing was fairly straightforward). I have spent a lot of time in keeping the star sizes under control. Starnet++ was a great help in achieving this. As per my usual workflow I develop several variants of the same image and combine them in various ratios to get the version that is the most pleasing to my eye..

Imaged with APT

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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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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.

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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.
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Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
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Status	Basic success
Started	...
Astrometry.net job	2861331
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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