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Published online by Cambridge University Press: 25 May 2016
The planetary nebula Abell 78 is slightly oval in an Hα image taken with a focal reducer attached to the 2.1-m telescope of San Pedro Mártir Observatory. Jacoby (1979) noted that the morphology of this PN in the [O III] λ5007 line is quite different from that shown on the POSS red plates.