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Need help understanding Object type Classifications in Stellarium

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#1 SeymoreStars

SeymoreStars

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Posted 11 January 2021 - 12:31 PM

Here are two examples copied from Stellarium. I understand the terms "Reflection Nebula"  and "Supernova Remnant", but do not understand the symbols in parenthesis following their respective types.

 

 

Spagetti Nebula
Sh2-240
type: supernova remnant (1,3,2)

 

 

Seagull Nebula
IC-2177
type: Reflection Nebula (3,2,3, I, VBR)

 

Thank you!!

Steve




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