Question: Which Baltimore group has a viron shape of icosahedral, replicates in the cytoplasm, is non-enveloped, and is from the astroviridae family?
SQL: SELECT baltimore_group FROM table_name_13 WHERE virion_shape = "icosahedral" AND envelopment = "non-enveloped" AND replication_site = "cytoplasm" AND family = "astroviridae"