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24. Commission des Parallaxes Stellaires et des Mouvements Propres

Extract

In November 1934 the President circulated a letter to the members of the Commission as follows:

Since the 1932 meeting the following projects have been completed, or are nearing completion:

  1. (1)The publication of many lists of trigonometric parallaxes.
  2. (2)The determination of the spectroscopic parallaxes of 4179 stars at Mt Wilson Observatory by Adams, Joy and Humason.
  3. (3)A discussion of systematic errors of trigonometric parallaxes by van Maanen and a re-discussion in the Astrophysical Journal of the same material by Mitchell and by Sterne.
  4. (4)The compilation of a second Yale Catalogue to include parallaxes completed before the end of 1934.
  5. (5)Substantial progress on the proper motions of 32,000 stars by Boss and his associates at the Dudley Observatory.
  6. (6)The publication at the Radcliffe Observatory of the proper motions of 32,000 stars from photographs on 115 Selected Areas.
  7. (7)The completion of the dynamical parallaxes of 2000 stars.
  8. (8)The completion of the proper motions of 18,000 stars derived from parallax plates at the Leander McCormick Observatory.
  9. (9)The publication at the Yale Observatory of the proper motions of 40,000 stars with a probable error less than 0”.010 determined from photographs by re-observing in zones the Astronomische Gesellschaft stars.
  10. (10)The determination of the proper motions of 50,000 stars in the Southern Hemisphere by Luyten from Harvard photographs.

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