HR 5900

Took some photos of HR 5900, a 4 star, 3 class Y brown dwarf system.

http://imgur.com/a/5rjSe

One question tho, why is it there's no indication of what type of rocks are in the rings of these stars? I used a detailed surface scanner. I mean the moon with the rings shows up as pristine rocky. Yet no info for the rings of the 3 brown dwarfs.

OwOrHTy.png
 
It seems that stars with a ring do not show their composition, clusters are the go
When i last checked a ring round a class y it was full of uranite and bauxite :(
 
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