Named in memory of Orren C. Mohler (1908–1985), solar astronomer, director of the McMath-Hulbert Observatory (1962–1979), chairman of the department of astronomy at the University of Michigan (1962–1970), member of the board of directors of the Association of Universities for Research in Astronomy (1962–1974). Mohler pioneered the exploration of the infrared solar spectrum with the lead sulphide infrared detector. His development of the vacuum spectrograph at the McMath-Hulbert Observatory led to the discovery of the “wiggly” solar spectral lines and to an understanding of the role of turbulence in the solar structure of the solar photosphere. (M 10546) _ _.