We have conflicting number series because any agency finding satellites need to invent one, when they cannot associate it with a known launch year+number+part. SpaceTrack and ESA are not likely to use SeeSat-L designations. If SeeSat observers tracked an object before ESA published its elements, we like to keep our numbering for historical continuity. SpaceTrack assigns 8XXXX catalog numbers to unmatched elsets, but haven't published any of these? Goddard SFC occasionally did. ESA has their 96XXX series, SeeSat the 90YYY numbers, both incremental by first orbit publication. Obviously, there is no proper Intl.ID if unidentified, but SeeSat adopted YYDDDA, where YY is year of first obs, DDD is 500+day no of first obs. OBSENTRY/IOD author George D. Lewis suggests other numeric standards for designating observations of unknowns, and offers a coding for type of orbit where we use "A": UNK Generic label for an unknown object. LEO Signifies that the object is suspected to be in low Earth orbit. MEO Signifies that the object is suspected to be in medium Earth orbit. HEO Signifies that the object is suspected to be in high Earth orbit. GEO Signifies that the object is suspected to be in geosynchronous orbit. GTO Signifies that the object is suspected to be in geosynchronous transfer orbit. MOL Signifies that the object is suspected to be in a Molniya orbit. ZRO Results from converting observations from the OTWG or Eberst formats, for which the traditional designation for any unknown is 9900000. /Björn ----- Original Message ----- > ... > Everyone, why do we have so many numbering schemes? > ... ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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