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Re: (IAAC) Obj: NGC 6205 = M13 - Inst: 8" f/6 Newtonian alt-az. mount




      >The stars of this cluster appear to form spider-
      >like arms. Also M13 is not exactly round and there
      >seemed to be a sharp edge on the North side.

Great set of observations, Michael! That sharp edge you saw has been noted by a 
few other observers on the list as well, in particular Todd Gross in his 16" 
scope:

http://www.tiac.net/users/lewkaren/netastrocatalog/msg00155.html
      >>I immediately noted a flattened side on M13,
      >>keeping it from being symetrical, almost as
      >>if someone stepped on it.

And meanwhile, William Schart agrees with your impression of knotted "arms" in 
the stellar outliers of this fine globular:

http://www.tiac.net/users/lewkaren/netastrocatalog/msg00765.html
    >>Higher power reveals a structure of crab-like arms

Keep these careful and well-logged observations coming, please! (Also, please 
use the form "M13 (NGC 6205)" for your object IDs: believe it or not, the "=" 
equals sign is actually used in some catalog IDs! :>)

Clear skies, and take care!
Lew Gramer



References: