Possible Explanation for Red Flickering of Betelgeuse Star in the Night Sky

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SUMMARY

The discussion centers on the red flickering observed in Betelgeuse, attributed to atmospheric effects rather than intrinsic properties of the star. Participants noted that stars closer to the horizon, like Betelgeuse, experience greater flickering due to the increased atmospheric interference. This phenomenon is less noticeable in brighter stars and is more pronounced in dimmer stars, especially when viewed through a telescope. The conversation also highlights the similar flickering effects observed in other stars, such as Sirius, when they are low on the horizon.

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so I was just looking up at the sky, as you do...
and I noticed one star was flickering red, I believe it was betelgeuse - as far as i could see on my sky map app.
Could anyone tell me the reasoning for this flickering? as none of the other stars visible were doing this - at least as far as i could tell.

thanks
 
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How close was it to the horizon? If star light has to pass through lots of horizon before it gets to you the range of flickering will be much greater than a star above it.
 
At least 45 Degrees above the horizon.
 
Even at that height, this flickering would just be atmospheric effects.
 
Betelgeuse is pretty bright too. Flickering is much harder to discern with dimmer stars. You will see the flickering of the dimmer stars through a telescope.
 
Although this makes sense I'm still a little confused. Stars that are closer to the horizon and stars that are near the star in question do not have this flickering?

Edit:@chemisttree - ok that makes sense now, your reply was posted while typing mine. :)

thanks
 
Take a look at Sirius just after it becomes visible. It looks like police lights, going from red to blue to white and everything in between thanks to the atmosphere when it's low on the horizon.
 
Funny, I was looking at Betelgeuse a few nights ago and wondered the exact same thing.
 
Thanks for your replies everyone.
I shall be sure to check Sirius out :)
 

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