Betelgeuse now at m = 1.506

[notFritzArgelander]

Dimming is slowing though.

https://phys.org/news/2020-01-betelgeus ... itude.html

[helicon]

This is also being covered by the mainstream media...with the slowing of the fading perhaps all will be well with the star, may be cyclical, or it may be that any supernova event is a long time in the future.

[Micke187]

just curios but if it went supernova how long would it take to see some nebulosity from it?

[notFritzArgelander]

just curios but if it went supernova how long would it take to see some nebulosity from it?

Depends on the aperture of the scope you are using....

[Micke187]

okey lets say in a year or two with a 2000mm fl and 200mm aperture scope is there a chance you could image something?

[helicon]

That would be great - a PN being born right in front of our eyes.

[notFritzArgelander]

That would be great - a PN being born right in front of our eyes.

Does the Crab Nebula count as a PN? No... It would be a SNR.

[notFritzArgelander]

okey lets say in a year or two with a 2000mm fl and 200mm aperture scope is there a chance you could image something?

Yes. The main problem is allowing the central remnant to fade enough. A few months should be enough.

First you'd get stronger emissions from the material Betelgeuse has already ejected. With SN1987A the Hubble was able to catch that within the first few months and it is ~300 times more distant. So that's easy.

Second you would see the expanding shock of debris. 7,000 km/s so about three times the radius of Jupiters orbit in a year? I'd think so with a larger scope. With a 200mm it'd be iffy in a year. I'd estimate 0.5 arc second per year expansion.