New discovery: the M31 OIII emission arc

[Stephane]

I was amazed that this oxygen emission arc has gone unnoticed up until this point despite M31 being the most photographed galaxy and despite the arc becoming noticeable at just 10+ hours of oxygen data.

I found both these videos just fascinating.

Team Strottner-Drechsler: https://m.youtube.com/watch?v=TEMXss1Qo4E

Bray Falls: https://m.youtube.com/watch?v=H9sqPHiCypE

I wonder what other incredible discoveries await, even near common targets that we shoot.

[Crater101 (Warren)]

Hadn't heard this, thanks for the links. It's discoveries like this that help make this hobby what it is.

[AdamJL]

Quite a few discoveries lately by amateurs who just seem to be doing super long exposures to pull out unseen details. I love it!

The Goblet one was another, a couple of years back.

https://www.astrobin.com/s9vmx1/0/

[Stephane]

“Cuiv the lazy geek” also posted a video on this discovery: https://m.youtube.com/watch?v=gDaQwS2Dm8Y