Access chain letter and residue number from Atom object

Dear,

I'm using BioJava for a project. After some filtering operations I've
an Atom list, but I've to know the chain and the residue number for
each atom.

My PDB has the following format:

HETATM 1661 MG    MG A 580      69.222  44.815  33.339  1.00
61.74          MG

Through an Atom object seems that should not possible to access to the
chain (A) and residue number (580). There is a way to do that?

Thanks

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