5

This has to do with ambiguities in the definitions used for certain terms, and software doing strange contortions to avoid breaking backwards compatibility. The USAF's family of Simplified General Perturbations propagators are based on mean element theories of orbital motion. However, there are multiple ways to define and compute mean motion, and ...


3

It seems to be considerably less. That is, they don't seem to have any sensors of their own -- they just wait for other people to report what they launched, and don't appear to seek regular updates. https://www.unoosa.org/oosa/en/ourwork/spacelaw/treaties/registration-convention.html 3235 (XXIX). Convention on Registration of Objects Launched into Outer ...


3

I find Ryan C's answer interesting... but I've never actually interpreted the documentation that way. It's difficult to be certain, since all official TLEs have had ephem type 0. But I (and others with whom I've discussed the matter) have assumed that ephem type 0 means "use SGP4 if you've got 6.4 or more revolutions/day; otherwise, use SDP4", ...


2

The answer is "no" because that is not its purpose. The role of the UN list is a place for the launching states to register those details they are obliged to do so by international treaty. From the first paragraph of Outer Space Objects Index: ... information provided to the United Nations in accordance with the Convention on Registration of ...


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