Description
The APPLAUSE Data Release 2 contains metadata about photographic plates and data extracted from digitized plates.
The source catalogue contains 2.59 billion extracted sources. The majority of sources have their positions (right ascension and declination) calibrated with the help of the Tycho-2 and UCAC4 catalogues. The database contains 1.407 billion sources with matched UCAC4 designations and 182 million sources with Tycho-2 designations.
The APPLAUSE DR2 database is organised in 16 tables.
Along with the data we publish the version of the pyplate software which was used to process the scanned material.
Attribution
If you have made substantial use of the data provided by APPLAUSE DR2, kindly include this acknowledgement
Funding for APPLAUSE has been provided by DFG (German Research Foundation, Grant), Leibniz Institute for Astrophysics Potsdam (AIP), Dr. Remeis Sternwarte Bamberg (University Nürnberg/Erlangen), the Hamburger Sternwarte (University of Hamburg) and Tartu Observatory.
Tables
An archive in APPLAUSE is a collection of plates, logbooks, and extracted data that originate from a specific instrument. The archive table contains one row for each plate archive. Unique Identifier archive_id
The table contains data on photographic plates or films as physical objects. An entry in this table does not guarantee that a scan of the plate is available. Unique identifier: plate_id.
Exposure time and observation time for plates. Unique Identifier exposure_id
Sources with calibrated magnitudes by pyplate. Calibration against UCAC4 and APASS. Unique Identifier source_id
Sub exposures provide exposures, which were split into n fragments. Unique Identifier exposure_id
This table contains calibrated magnitudes, sky coordinates and source designations, exposure and observation time. Unique Identifier source_id.
The scan table registers all ingested scans of the photographic plates, giving sizes, etc. Unique Identifier scan_id
Information about logbooks from various archives or observation sites. There is no direct relation betweeen a plate and a logbook. Unique Identifier logpage_id
The logpage table contains data on individual digitized logbook pages and also images of plate covers/envelopes. Unique Identifier logpage_id
The plate_logpage table stores links between plates and logbook pages / plate envelopes.
The process table contains data on pyplate"s processing of source extraction and astrometric calibration of plate scans. Unique Identifier process_id
Table of extracted sources. A row in the source table corresponds to an extracted source from a plate scan. Unique Identifier source_id
The table contains astrometric solutions of plate scans. Unique Identifier solution_id
This table contains data on photometric calibration that was carried out on whole scans and in annular bins. Unique Identifier calib_id
This table contains data on the determined color terms. Each row in the table corresponds to a scan of a photographic plate. Unique Identifier color_id
Fitting parameters for photometric calibration. This table contains standard deviations of residuals for each fit. Unique Identifier cterm_id
This table contains photometric error estimates for individual magnitude ranges in annular bins. Unique Identifier sub_id
HEALPix center coordinates (nside=256, nested scheme)
You can access this schema using the query interface and download the results afterwards.
You can use the following DOI to cite this schema in a publication:
This dataset is published under the CC0 1.0 Universal (CC0 1.0).