| Name | HCG 18 |
| Type | GALCL [S2] |
| Other names | ARP258 |
| RA | 02:39:06.8 |
| Dec | +18:22:59.0 |
| major_axis | 2.6' |
| mag | 12.7 |
| surface_bright | 99.9 |
| Name | HCG 18 |
| Type | GALCL [S2] |
| Other names | ARP258 |
| RA | 02:39:06.8 |
| Dec | +18:22:59.0 |
| major_axis | 2.6' |
| mag | 12.7 |
| surface_bright | 99.9 |