Arp 21 galaxy
Arp 21 is a peculiar galaxy located in the constellation of Leo Minor. The Arp Atlas is a catalog of 338 peculiar galaxies. Here are the key stats on Arp 21:
| Arp #: | Arp 21 |
| Constellation: | Leo Minor |
| Notable feature: | 3 arms |
| Designation: | CGCG 155-056 |