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Joseph Turner
Eta Argus Nebula, taken with Great Melbourne Telescope, 1883
1883, 7 January
Photograph
Melbourne Observatory Collection
MM 30402
LL/91530
Experimental photograph of Eta Argus Nebula taken by Joseph Turner with the Great Melbourne Telescope, 7 January 1883.
In 1882 astronomers in Britain and America began to successfully use the more sensitive dry plates to photograph nebulae and comets, which had previously not been clearly photographed with wet plates. Astronomers at Melbourne Observatory began experiments using the Great Melbourne Telescope to photograph nebulae in 1882, with mixed results. Assistant Astronomer Joseph Turner got good results taking photos of portions of Orion Nebula with a four minute exposure, but had no success with Eta Argus Nebula, despite exposures of up to 45 minutes.
Government Astronomer Robert Ellery noted in his annual report for 1882/3 that 'The great obstacle to obtaining photographs of faint objects is the difficulty of keeping such a large telescope steady during a period necessary for the exposure of the plate, so that, when a sufficient exposure has been obtained, the stars are all considerably enlarged from the vibrations and small movements of the telescope in the interval.'
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