Archives of Photographic PLates for Astronomical USE

APPLAUSE Data Release 4 published

by Taavi Tuvikene, Harry Enke on 30/06/22

Data Release 4 (DR4) was published on June 30, 2022. It contains images and data from the Bamberg, Hamburg, Potsdam, Tautenburg, Tartu and Vatican Observatory plate collections. 125473 scans of 97703 photographic plates; DR4 contains 125473 scans of 97703 photographic plates. All material of former data releases is included (execpt the Einsteinturm plates, which are published as DR3s). Additionally, 9113960 images of logbook pages and plate covers; 219 logbooks are available. More than 4.486 billion extracted sources (individual detections), of which 2.132 billion have matched Gaia EDR3 designations, with 1.256 billion unique matches.

More on DR4 you find at Data Release 4. For each of the 27 plate archives/collections of DR4 coverage plots are provided.

Also: with DR4 we use a very much improved version of Daiquiri software which provides now support for IVOA protocols and extended access methods via datalink. A full support for ADQL and TAP, and export of selected data into various forms (VO Table, CSV, FITS) is built in.

Compliance with the FAIR principles enhanced by an improved OAI-PMH API and enhanced metadata schema (DataCite, IVOA, Dublin Core), enabling other science communities to better access the metadata with their usual methods.