Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Family | Baltimore group | envelopment | Virion shape | Replication site |
| --- | --- | --- | --- | --- |
| Adenoviridae | Group I | non-enveloped | icosahedral | nucleus |
| Herpesviridae | Group I | enveloped | complex | nucleus |
| Papillomaviridae | Group I | non-enveloped | icosahedral | nucleus |
| Polyomaviridae | Group I | non-enveloped | icosahedral | nucleus |
| Poxviridae | Group I | enveloped | complex | cytoplasm |
| Hepadnaviridae | Group VII | enveloped | icosahedral | nucleus |
| Parvoviridae | Group II | non-enveloped | icosahedral | nucleus |
| Astroviridae | Group IV | non-enveloped | icosahedral | cytoplasm |
| Caliciviridae | Group IV | non-enveloped | icosahedral | cytoplasm |
| Picornaviridae | Group IV | non-enveloped | icosahedral | cytoplasm |
| Coronaviridae | Group IV | enveloped | helical | cytoplasm |
| Flaviviridae | Group IV | enveloped | icosahedral | cytoplasm |
| Togaviridae | Group IV | enveloped | icosahedral | cytoplasm |
| Hepeviridae | Group IV | enveloped | icosahedral | cytoplasm |
| Retroviridae | Group VI | enveloped | icosahedral | nucleus |
| Orthomyxoviridae | Group V | enveloped | helical | nucleus |
| Arenaviridae | Group V | enveloped | helical | cytoplasm |
| Bunyaviridae | Group V | enveloped | helical | cytoplasm |
| Filoviridae | Group V | enveloped | helical | cytoplasm |
| Paramyxoviridae | Group V | enveloped | helical | cytoplasm |
| Rhabdoviridae | Group V | enveloped | helical, bullet shaped | cytoplasm |
| Unassigned | Group V | enveloped | spherical | nucleus |
| Reoviridae | Group III | non-enveloped | icosahedral | cytoplasm |
Question:
Which Baltimore group has a viron shape of icosahedral, replicates in the cytoplasm, is non-enveloped, and is from the astroviridae family?
Answer:
Group IV