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) |