Larry Klaes asked : What exactly is Cosmos 397? What was its mission? Is there a place where I can find such information on my own.... I'm sorry, but I don't know much of that kind of facts. I usually don't care, but I am impressed by others' knowledge. E.g. R.Kracht@t-online.de (Rainer Kracht) used Russell Eberst's observations to deduce standard magnitudes for satellites, in groups of similar designs - of which I was not aware. (seesat-l no. 1164-1441, then 1598 and 1636 ) I don't know their sources. For new launches I do get Jonathans Space Reports at ftp://sao-ftp.harvard.edu/pub/jcm/space/news (issues from 1989 on are available) and Spacewarn Bulletins at http://nssdc.gsfc.nasa.gov/spacewarn/ (old issues from 1991 on), and OIG weekly reports via telnet to oig1.gsfc.nasa.gov. I also keep the latest OIG SatSit Reports available on my PC. (Total listings of all objects) In my QuickSat-compatible reference file I keep mainly the NORAD and International ID's, the common name, standard magnitude and/or Radar Cross Section, and a category based on orbit type and visibility (classified, geostationary, high, below my horizon, decaying, decayed, Molniya, ...) ------------------------------------------------------------ -- bjorn.gimle@online.dextel.se +46-8-7428086 (home) -- -- bjorn@tt-tech.se +46-8-59095789 (office)-- -- 59.22371 N, 18.22857 E AND member of : -- -- seesat-l@iris01.plasma.mpe-garching.mpg.de -- ------------------------------------------------------------