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— twitter-user (@username) date
Rehosting just in case: http://i.imgur.com/zRzWQ0w.jpg
You can see Anno's King doodle and Sadamoto's Asuka (did he always sign autographs in katakana?), both dated May 15th, 2010. Can't tell who the other signatures are.
https://en.wikipedia.org/wiki/Subaru_Telescope
There's your fill of "kinda neat" for the day.