Photometric Periods of Artificial Satellites 7 ---------------------------------------------- This database of Photometric Periods of Artificial Satellites (PPAS) has been collected by the Belgian Working Group of Satellites (BWGS). It contains more than 43000 observations, most of them giving accurate timings of the flash period of the observed object. Comparing this version to the PPAS 6, it contains another part of the archive of Horst Koehnke, as well as new observations obtained between April 1996 and May 1997. Thanks to the effort of mainly Leo Barhorst a number of faulty entries in our archive have been corrected. The PPAS consists of 40 Text or ASCII-files (one for each launch year) which contain the observations of the satellites launched in that year. All PPAS- files have the extension '.OBS'. E.g. The file 'PPAS91.OBS' contains all observations of satellites which were launched in 1991. In the archive you will find the following files : ppas7.txt : introductory text on how the database is organized (40 text files, (28 Kb) one per launch year), what the PPAS format is, list of observers and so on. ppas7.uue : uuencoded and zipped version of the ppas7-files. (842 Kb) Send a message with Subject: archive get ppas7/ppas7.txt to SeeSat-L-request@cds.plasma.mpe-garching.mpg.de to get the introductory text about the PPAS7 Send a message with Subject: archive get ppas7/ppas7.uue to SeeSat-L-request@cds.plasma.mpe-garching.mpg.de to get the uuencoded and zipped version of the ppas7-files. friendly regards, Kurt Jonckheere (kjonckheere@unicall.be) Observations collector of the Belgian Working Group Satellites