AAVSO: American Association of Variable Star Observers

DASCH Project Update (Abstract)

Volume 47 number 2 (2019)

Edward Los
Harvard College Observatory, 60 Garden Street, Cambridge, MA 02138

Abstract

(Abstract only) The “Digital Acesss to a Sky Century @ Harvard” (DASCH) project is an effort to scan the glass plate negatives in the archive of the Harvard College Observatory for the purpose of generating light curves which can span 100+ years. The logbook digitization project is complete. The scanning project is 77% complete. With the recent DR6 release, all of the photometry North of the galactic plane is now available. We have recalibrated nearly all of the photometry with the ATLAS refcat2 catalog. Parallel to the scanning, there are efforts to improve the yield with new algorithms for multiple exposure processing and astrometry.