LBN 576 in Cassiopeia -- Borg 125 f/8 SHO with RGB stars (Scott Denning)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas)

LBN 576 in Cassiopeia -- Borg 125 f/8 SHO with RGB stars, Scott Denning

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LBN 576 in Cassiopeia -- Borg 125 f/8 SHO with RGB stars

Powered byPixInsight

LBN 576 in Cassiopeia -- Borg 125 f/8 SHO with RGB stars

LBN576 “Popped Balloon Nebula” Supernova remnant August 28-31 2023
Borg 125SD f/8 on 10Micron with ASI2600mm + Chroma filters
Ha=65x300s; O3=64x300s; S2=61x300s (roughly 5 hours each, total 15 hours)
R=G=B = 5x15s just for star colors

Supernova remnant ~10k light years distant in Cassiopeia
a.k.a. Abell 85, CTB1 (originally misidentified as a planetary nebula)
~ 100 ly in diameter

BXT,SXT,NXT
Starless NB combination using Foraxx script
Ha stars colorized with short-exposure RGB-SPCC

Aggressive HT stretch of starless, then LHE, curves, and USM
Screen combine stars+starless

This popped balloon is almost 100 light years in diameter! It’s the expanding remnant of a supernova – a huge star that blew itself to smithereens hundreds of centuries ago.

It’s about 10,000 light years away so we see it at the time our distant ancestors were starting to settle in villages. Perhaps 10,000 years before that, when their distant ancestors sat shivering by a fire during the depths of the last Ice Age, they marveled at a blazing new star in the northern sky. That blaze was the blast that produced the remnant we see here now.

The bright sphere is composed of fluorescent hydrogen (red) and oxygen (blue) plasma, kindled into colorful glow by the expanding shock wave ripple of the supernova blast. Along the lower left the superhot gas has somehow erupted beyond the shock envelope, spilling glowing hydrogen into the interstellar medium beyond.

LBN 576 floats high in the late summer sky in the royal constellation Cassiopeia. This is about 15 hours of exposure over three nights with narrowband filters (hydrogen, oxygen, and sulfur), plus some short red/green/blue shots just for the star colors.

Please note: The following tables are updated every 24 hours.

Distribution of astrophotographers

This table shows the number of distinct astrophotographers who have been assigned and IOTD/TP award compared to the total number of images awarded.
	Distinct awarded users	Total awarded images
Image of the day
Top picks
Top pick nominations

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
Solar system
Extremely wide field
Star trails
Northern lights
Noctilucent clouds
Landscape

Distribution of data sources

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
Backyard
Traveller
Own remote observatory
Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
Mix of multiple sources
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	Basic success
Started	...
Astrometry.net job	8390511
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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Contribution Index (beta):

LBN 576 in Cassiopeia -- Borg 125 f/8 SHO with RGB stars

LBN 576 in Cassiopeia -- Borg 125 f/8 SHO with RGB stars

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Contribution Index (beta):

LBN 576 in Cassiopeia -- Borg 125 f/8 SHO with RGB stars

LBN 576 in Cassiopeia -- Borg 125 f/8 SHO with RGB stars

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