The observers were Magda Arnaboldi and Ken Freeman from the Mount Stromlo Observatory in Australia. They obtained the spectra and measured the velocities of 37 planetary nebulae in this galaxy that is located at the centre of the southern Fornax cluster of galaxies, at a distance of about 50 million light-years. The total mass of the galaxy can be inferred from the measured motions and was found to be about ten times larger than the combined mass of the stars and nebulae seen in this galaxy. This reduced the wavelength range of each spectrum and increased the number of slitlets in each MOS mask. The total integration time for each field was 5 hours, split into shorter exposures.
North is up and East is to the right.