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@REPLYADDR Martin Brown
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@REPLYTO 2:5075/128 Martin Brown
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On 15/09/2023 13:43, Will Peters wrote:
> On 9/15/23 4:01 AM, Martin Brown wrote:
>> The (amateur) astronomy pictures of the year have been announced:
>>
>>
https://www.bbc.co.uk/news/in-pictures-66807814
>>
>> The most stunning is the very deep M31 image showing a gas plasma
>> cloud in the same field which it seems from the blurb has not been
>> noticed until now!
>>
>> Mars setting behind the moon and the sprites are my other favourites.
>>
>> The other stunning image is of a comet disconnection event:
>>
>>
https://www.bbc.co.uk/news/science-environment-62916234
>>
>> Online source at the RGO with slightly more info.
>>
https://www.rmg.co.uk/whats-on/astronomy-photographer-year/galleries/overall-win
ners-2023
>>
>>
>
> Seems suspect that the "plasma arc" near M31 oddly has not been noticed
> until recently. The write up mentions that "scientists are now
> investigating" so it must really exist. Hard to believe that with as
> many images of M31 of varying exposures and filtration that something
> like that would be missed.
I`m inclined to agree. I`m also a bit puzzled why it hasn`t shown up on
various 21cm hydrogen line observations. It isn`t like M31 hasn`t been
observed in all wavebands and lots of times.
However, their image frame is larger and deeper than most.
--
Martin Brown
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