Celestial hemisphere:  Northern  ·  Constellation: Andromeda (And)  ·  Contains:  Andromeda Galaxy  ·  M 31  ·  M 32  ·  NGC 221  ·  NGC 224
Andromeda and the OIII Flower, Alex Helms
Andromeda and the OIII Flower, Alex Helms

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Description

An attempt at imaging the OIII "flower" in M33. After 25.5 hours of OIII with continuum subtraction I could just barely see the structure, though it's very noisy. I wasn't committed enough to double my SNR by jumping to 100 hours of exposure so it is what it is. I'm pleased enough with the result but much prefer the image without OIII. For those attempting, try it with something faster than f/6.7 and you definitely need a lot of time.

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Andromeda and the OIII Flower, Alex Helms