Petr, Thanks for your mail. I have updated my web site with the information you mailed me in January and with your new corrections. The only one I disagree with is 1980-31. I believe based on analysis of tracking data that the object cataloged as 1980-31C (by NORAD) was really the payload; 1980-31A was the BOZ upper stage orientiation unit. 1988-09: Yes, the payloads failed to separate (actually would have been 4 objects: three Kosmos/Uragan satellites and one Blok-DM upper stage). Different agencies used different designators; NORAD gave one designator 1988-09A and I will change to use that. You are very welcome to use my work in any way that is useful to you. My opinion on the erroneous registration of decays is that these are mostly typos: I have seen a significant number of other examples in the case of US debris objects, but haven't kept a list. In most cases the wrong designation was given, it was a different object that actually decayed. I suggest that we silently correct these errors when they are spotted. The exceptions are 1980-30A, 1980-89A, 1981-53A, 1982-55A, 1983-44A, 1987-20A. These object were deliberately or (in the case of 1980-30, 1981-53) accidentally exploded in orbit. Thus the USSR deemed them to no longer exist in orbit, while the USA retained the 'A' designation for one of the largest fragments of each explosion. Since the registration of decays is so incomplete, I do not feel that discrepancies in them should be a priority - I would much rather see a more complete registration of launches before worrying too much about the decays. Regards Jonathan McDowell