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Mystery in Boötes

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#1 Dynan

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Posted 25 July 2021 - 08:33 PM

13 Transient Objects. Transient because they're gone...

 

https://earthsky.org...servatory-1950/

 

Cross indicates position relative to Boötes:

 

Boötes.jpg


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#2 pretyro

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Posted 25 July 2021 - 10:47 PM

13 Transient Objects. Transient because they're gone...

 

https://earthsky.org...servatory-1950/

 

Cross indicates position relative to Boötes:

 

attachicon.gifBoötes.jpg

That is interesting -- I had not heard about this, of course I am pretty new to astronomy.  Your link referred to a paper that concluded these transients have not been seen since.

 

Have transient objects been seen (and lost) in other places besides Bootes?  That they were seen in a red sensitive plate and not a blue one taken a half hour earlier adds the complexity.  How often is a complete sky survey performed (using both red and blue sensitive images) down to a magnitude of 20?



#3 starblue

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Posted 26 July 2021 - 02:14 AM

It could be plate defects. Coatings weren't always laid down perfectly back then. I think I read that observatories often took 2 plates in succession of the same object just so they could compare them for defects. I'm surprised the article never even mentions plate defects.



#4 figurate

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Posted 26 July 2021 - 04:47 AM

The very uniform symmetry of the mystery 'spots' is problematic, otherwise an obvious explanation would be contamination, plate emulsion defects, or some sort of artifact from the photographic process. I did find this technical note from the original PSS which ends with a catalog of the various types of defects that were found on the plates; real world circumstances being such that perfection was not always attainable-  https://authors.libr..._Sky_Atlas.pdf 


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