13 Transient Objects. Transient because they're gone...
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Posted 25 July 2021 - 10:47 PM
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?
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.
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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