![]() ![]() The oldest scanned plate in DR4 is from 1893, belonging to the Potsdam Carte du Ciel archive. Time coverage is illustrated in the following figure. Of the Northern Sky catalog from Bamberg, the whole sky is covered more evenly (compared to DR3 of APPLAUSE), there are now even more The following sky coverage plots show the distribution of extracted source detections in the sky. The calibrated magnitudes together with observation times form light curves that can be extracted from the database. Since EDR3 is the current astrometric catalog with the most precision and coverage, it is the reference catalog for most astrometry matching.Ī classification - based on machine learning - of all source detections provides a likelihood for distinguishing between objects and artifacts.Įxtracted source detections have their magnitudes calibrated, using the Gaia EDR3 catalogues as reference. The majority of extracted sources have their positions (right ascension and declination) calibrated with the help of Gaia EDR3 catalogue. ![]() 4.486 billion extracted sources (individual detections), of which 2.132 billion with matched Gaia EDR3 designations, 1.256 unique matches.photometric calibration for 66328 plates.astrometric solutions for 68399 plates.113960 images of logbook pages and plate covers.metadata for 94090 plates with a total of 139539 exposures.125473 scans of 97703 photographic plates.images and metadata from 27 plate archives/collections from Hamburg, Bamberg, Potsdam, Tautenburg, Tartu and Vatican Observatory.The APPLAUSE Data Release 4 (DR4) is the fourth release of archives of digitized photographic plates,Īlong with metadata about scientific content the plates, digitized observation logbooks, and table data extracted from the images. Without signing in, the query interface can be used as a guest user. Then you can submit SQL queries or fill search forms using the query interface. Please use the registration form to get a user account. On this site, you can get access to the plate data that are processed so far. The work is carried out within the project "Digitalisierung astronomischer Fotoplatten und ihre Integration in das internationale Virtual Observatory", which is funded by the DFG. In addition, the corresponding plate envelopes and observation logbooks are digitized, and further metadata are entered into the database. ![]() The plates are digitized with high-resolution flatbed scanners. Karl Remeis-Sternwarte Bamberg, and Leibniz-Institut für Astrophysik Potsdam (AIP). There are about 85000 plates in the archives of Hamburger Sternwarte, Dr. In particular, for the study of long-term variability of many types of stars, these measurements are of immense scientific value. While these observations lead to significant discoveries in the past, they are also of interest for scientists today and in the future. German astronomical observatories own considerable collection of photographic plates. More sample images can be found in theĪccess to all image material is also provided by the ![]()
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