| Name | IC 3556 |
| Type | GX [SB0] |
| Other names | PGC42005 |
| Constellation | Coma berenices |
| descr | UGC NOTES misprints the identification as 'NGC 4536'. |
| RA | 12:35:58.5 |
| Dec | +26:57:56.0 |
| major_axis | 42.0'' |
| minor_axis | 18.0'' |
| position_angle | 170.0 |
| mag | 14.6 |
| surface_bright | 12.6 |