Table schema:
CREATE TABLE table_name_13 (baltimore_group VARCHAR, family VARCHAR, replication_site VARCHAR, virion_shape VARCHAR, envelopment VARCHAR)

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"