CTB-1 (Abell 85 / LBN 576) in Cassiopeia in HOO + RGB Stars (CrestwoodSky)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: The star 9 Cas

CTB-1 (Abell 85 / LBN 576) in Cassiopeia in HOO + RGB Stars, CrestwoodSky

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CTB-1 (Abell 85 / LBN 576) in Cassiopeia in HOO + RGB Stars

Powered byPixInsight

CTB-1 (Abell 85 / LBN 576) in Cassiopeia in HOO + RGB Stars

This image was captured over six nights in mid-October 2023 with an ASI2600mm Pro through an Explore Scientific 127ED on an EQ6-R Pro mount.

The image comprises:

Ha: 109 x 180s
OIII: 131 x 180s
R: 20 x 180s
G: 20 x 180s
B: 20 x 180s

Total integration time was 15 hours. The image was processed in Pixinsight and tweaked in Photoshop.

This supernova remnant is estimated to be 9,780 light years distant and spans about 98 light years in diameter. It is very faint, requiring a substantial amount of exposure time to draw out even the most basic features. It took several processing attempts to bring out the filaments without ruining the rest of the image.

I would have liked to capture more data, but weather and the backlog of other objects I wanted to image while the moon was absent (there is never enough time!) constrained the effort. Still, I am generally pleased with the result - especially for an object I have never imaged before.

Narrowband imaging
ZWO ASI2600MM Pro
Imaged with APT
Arizona Astrophotographers
Explore Scientific 127
The refractors!
Cloudy Nights

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	Distinct awarded users	Total awarded images
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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
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Star trails
Northern lights
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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
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Public amaeteur data
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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.

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
Started	...
Astrometry.net job	8639884
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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CTB-1 (Abell 85 / LBN 576) in Cassiopeia in HOO + RGB Stars

CTB-1 (Abell 85 / LBN 576) in Cassiopeia in HOO + RGB Stars

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CTB-1 (Abell 85 / LBN 576) in Cassiopeia in HOO + RGB Stars

CTB-1 (Abell 85 / LBN 576) in Cassiopeia in HOO + RGB Stars

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