Huge Supernova Remnant discovered in Ursa Minor/Ursa Major

[Knight of Clear Skies]

https://skyandtelescope.org/astronomy-news/astronomers-discover-huge-circular-arc-near-the-big-dipper/

30 degrees long, that's three times the apparent size of Barnard's Loop. Here's the MDW survey image.

[Nigeyboy]

This is why I love astronomy! Even now, discovering something so large that hasn't been seen before!!

[Craney]

  phew...what a whopper!!!!

That's in the realm of the all-sky-camera brigade !!!!....  who now have to start cooling their chips and looking for hemi-sperical Astrodons.....  they'll be cheap.

[Nigella Bryant]

WOW, who'd have thought.

[Gina]

I already cool my ASC and I did once think of trying Ha filtering.  There is room for a naked filter between the lens and the camera sensor.  OTOH With the 28mm lens and ASI1600MM-C camera, I get a FoV of 37.5° x 28°which would cover it.  Might have a go sometime.

[andrew s]

The large angle of incidence on the Ha filter will shift if off band as you move from the centre of the field.

Regards Andrew