GAAC Speaker Friday Night 5/12: Ed Los, Rescuing Valuable Historic Astrophotos

At this month’s GAAC meeting, 8:00 Friday night, May 12, at the Lanesville Community Center, we are thrilled to host Ed Los, a long-term member of the “Digital Access to a Sky Century team at Harvard” (DASCH). Ed will bring us up to date on the project to digitize over 500,000 images of the night sky collected on glass photographic plates between 1885 and 1993.

Image: Portion of Plate b41215 of Halley’s comet taken on April 21, 1910 from Arequipa, Peru with the 8-inch Bache Doublet, Voigtlander.

These images offer us far more than mere historic value. They have greatly advanced what we know of the composition of stars, their inherent luminosities and distances, and, as a 100-year record of the skies, they are sure to continue to inform our understanding. Already as part of this ongoing project more than 162,000 plates, along with data from a card catalog and 1200…