| Telescope | Hubble Space Telescope |
| Instrument | WFPC2 |
| Filters | Hα (=red), [N II] λ6584 Å (=green), [O I] λ6300 Å (=blue) |
| Date | 1994 September 18 |
| Credits | J.P. Harrington, K.J. Borkowski (University of Maryland) and NASA |
| Telescope | Hubble Space Telescope |
| Instrument | ACS |
| Filters | Hα+[N II] λ6584 Å (=red), [O III] λ5007 Å (=blue), FR505N (=green) |
| Date | 2002 May 4 |
| Credits | NASA< ESA, HEIC, and The Hubble Heritage Team (STScI/AURA) |
| Telescope | Nordic Optical Telescope (La Palma, Spain) |
| Instrument | |
| Filters | [N II] λ6584 Å (=red), [O III] λ5007 Å (=blue and green) |
| Credits | R.L.M. Corradi (Isaac Newton Group) and D. Goncalves (Instituto de Astrofísica de Canarias) |