CTB1/Abell 85 “The Garlic Nebula” - HOO palette (Charles Bracken)

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

CTB1/Abell 85 “The Garlic Nebula” - HOO palette, Charles Bracken

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CTB1/Abell 85 “The Garlic Nebula” - HOO palette

Link: https://digitalstars.wordpress.com/2022/10/22/ctb1-abell-85-the-garlic-nebula/

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CTB1/Abell 85 “The Garlic Nebula” - HOO palette

Link: https://digitalstars.wordpress.com/2022/10/22/ctb1-abell-85-the-garlic-nebula/

I’m glad I finally got around to shooting this object. It is so faint that only a hint of it appears on each H-alpha sub, and it was not visible at all on the individual OIII subs. Only once you integrate the subexposures does it appear. There is SII present, but it overlaps with the H-alpha signal (but fainter), so using an HOO palette was the way to go. This 269 3-minute exposures in H-alpha and 145 in OIII. I took 50 SII subs, but they aren’t incorporated into this image.

On my blog (linked above), I've included an image that shows each channel separately.

CTB1 was discovered in 1955 by George Abell on the Palomar survey plates, thinking it was a planetary nebula based on its shape. In 1960 Robert W. Wilson (who later won the Nobel Prize with Arno Penzias for discovering the cosmic background radiation) and J. G. Bolton properly cataloged it as part of an early radio telescope survey. This list was known as CalTech observatory list B, hence the CTB designation. In 1966, Abell included it in his catalog of planetary nebulae (not to be confused with his catalog of galaxy clusters) with the note, "it may be a supernova remnant," as it was already thought to be an SNR based on its radio signal. By 1968, this was firmly established. Thus, CTB1 is probably the proper designation for this object, even though Abell was actually the discoverer.

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CTB1/Abell 85 “The Garlic Nebula” - HOO palette

CTB1/Abell 85 “The Garlic Nebula” - HOO palette

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CTB1/Abell 85 “The Garlic Nebula” - HOO palette

CTB1/Abell 85 “The Garlic Nebula” - HOO palette

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