DASCH: Digital Access to a Sky Century @ Harvard
A New Look at the Temporal Universe

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Search the Photographic Plate Collection

The digitized images of the Harvard College Observatory's Photographic Plate Archive may be searched by object identifier, celestial coordinates, date range, or by plate number.

Blank fields imply a wildcard. Only one exposure is displayed for each scanned or fitted plate. Use the browser "stop" button to interrupt the search.


(* = Required)

Specify plate series and/or number to limit search for above object.




J2000 B1950
(hh:mm:ss.sss)
(dd:mm:ss.sss)
(* = Required)

Specify plate series and/or number to limit search for above coordinates.






(20000 or less)
(600 or less arcsecs)
(yyyy-mm-dd or year. frac)
(yyyy-mm-dd or year. frac)

WCS Fitted Plates Scanned Plates Unscanned Plates Entire Database
Search inner spatial bins of unfitted plates

(20000 or less)

Heliocentric Julian UT

Sexigesimal Decimal

FITS JPEG

TAR ZIP

Get the correct version of DS9


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Plate list

WCS Fitted Mosaic positions obtained after June 26, 2008 used tools provided by Astrometry.net/.