Archives of Photographic PLates for Astronomical USE

Contents of APPLAUSE DR1

Plate images

APPLAUSE provides two kinds of images of photographic plates: low-resolution preview images obtained before removing annotations from plates and high-resolution scans made after cleaning.

In total, DR1 contains 25612 scans of 19335 plates. 6275 plates have been scanned in two directions at a 90-degree angle.

Preview images are provided in either JPEG or PNG format. High-resolution scans have been made with Epson flatbed scanners at a resolution of 2400 dpi. The scans are provided in FITS format, with a total size of 16 TB.

Access to images is provided through the query interface. If the result table contains links to images, the files can be downloaded either individually, or all files in selected columns or rows together.

Images of logbooks, envelopes, etc

APPLAUSE provides JPEG images of digitized logbook pages, plate covers/envelopes, and other related material. As with plate images, the log-page images can be accessed only through the query interface.


The APPLAUSE DR1 database contains metadata about photographic plates and data extracted from digitized plates.

The source catalogue contains 1.66 billion extracted sources. The majority of sources have their positions (right ascension and declination) calibrated with the help of the UCAC4 catalogue. The database contains 837 million sources with matched UCAC4 designations and 111 million sources with Tycho-2 designations.

Detailed information for each table you find here.