Revised Magnitudes and Color Indices of the Planets.

In connection with the preceding investigation relating to the photovisual magnitudes of the stars, photovisual and photographic magnitudes of the brighter planets have been determined by out-of-focus methods. These observations were made with the view of obtaining better values of color index. The detailed discussion will appear soon in Harvard Annals, 85, No. 4. The number of plates taken for this purpose, including those reported in Harvard Annals, 84, No. 4, is 130. A summary of the results from all these observations is contained in the following table, which gives magnitudes for Venus at superior conjunction, and of the other planets at mean opposition, together with the color index of each.