1989 EG. Discovered 1989 Mar. 2 by R. H. McNaught at Siding Spring.

Named for John (Jack) Locke Estens (1919- ), Australian astronomy educator. Following a life of farming, he devoted his retirement to bring astronomy to the public with his handsomely constructed observatory and lecture room in Gilgandra, N.S.W. Opened in 1975, the observatory saw a steady stream of visitors until his second retirement in 1996. Always friendly and enthusiastic, he provided a service missing at the professional observatories, with his personal tours of the night sky. (M 29143)

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