R. J. Mitchell, active in astronomy in the 1850s, was an assistant to William Parsons, 3rd Earl of Rosse.
He studied at Queen's College, Galway[1] and was employed as a scientific assistant to Lord Rosse in 1853.
[1] Mitchell was a talented observer and drawer who made many discoveries with Lord Rosse's 72-inch telescope,[1] and it has been suggested that many of the discoveries claimed by Lord Rosse were actually made by Mitchell.
[2] After leaving the employ of Lord Rosse in May 1858, Mitchell began a career in the Irish civil service.
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