Abell 85 - CTB1 (Georg N. Nyman)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: 10 Cas · 6 Cas · 9 Cas · HD1009 · HD1010 · HD1057 · HD1069 · HD108 · HD1142 · HD1166 · HD1201 · HD1239 · HD1287 · HD134 · HD1383 · HD1400 · HD1457 · HD1544 · HD1545 · HD1613 · HD163 · HD222217 · HD222275 · HD222407 · HD222647 · HD222670 · HD222682 · HD223057 · HD223070 · HD223386 · And 76 more.

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Abell 85 - CTB1

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Abell 85 - CTB1

This is a modified SHO version with synthetically optimized stars from SHO data to RGB converted. The raw data are from Telescope.Live from a Takahashi FSQ 104ED, equipped with a FLI-PL16083 CCD camera with Ha, OIII and SII filters. Since the pixelsize is by far to large for that focal length, I had to drizzle the data to get rid of square stars.

As the data had been taken over a period of half a year, sometimes only one or two per day, I include only a few of them for information

Processing primarily in APP, then in PixInsight and Photoshop.

In total 34x600" Ha, 34x00" OIII and 34x600" SII.

Interesting is the fact that Abell 85 is not really that nebula, it is listed as CTB1. Abell85 is the entire region there with about 500 galaxies at an estimated distance from Earth of about 700Mio LJ. There is also the currently largest Black Hole inside of Holm 15a with about 40Billion sunmasses.
The nebula itself is rather weak and needs long exposure time and consists of a lot of Ha and SII and some OIII and is estimated to be about 10000LJ distant. The OIII emission is in the North/East, that´s why I rotated the image to the probably proper orientation.

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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	7984658
PixInsight job	KODO15XIGHLB9TJ51VE7G4NVKOBJSG39
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	23h58m08s.40
RA (top/left)	00h18m31s.28
RA (top/right)	23h30m49s.79
RA (bottom/right)	23h41m19s.71
RA (bottom/left)	00h21m47s.19

Dec (center)	+62°16′42″.7
Dec (top/left)	+65°09′03″.6
Dec (top/right)	+64°16′00″.9
Dec (bottom/right)	+59°15′08″.5
Dec (bottom/left)	+60°00′08″.1

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Abell 85 - CTB1

Abell 85 - CTB1

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Abell 85 - CTB1

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