- International Designator
The International Designator, also known as COSPAR designation, and in the United States as NSSDC ID, is an international naming convention for satellites. It consists of the launch year, a 3-digit incrementing launch number of that year and up to a 3-letter code representing the sequential identifier of a piece in a launch.
For example, 1957-001A is Sputnik 1's launch vehicle and 1957-001B is the actual Sputnik 1 satellite. The number reveals that it was launched in 1957 and that it was the first launch made that year. Another example is 1990-037B, the Hubble Space Telescope, which was the 37th known successful launch world wide in 1990. 1990-037A is the Space Shuttle Discovery on mission STS-31, which was to carry the Hubble telescope into space.
The designation system has been generally known as the COSPAR system, named for the Committee on Space Research (COSPAR) of the International Council for Science. This group[which?] subsumed the first designation system, devised at Harvard University in 1958. That system used minuscule letters of the Greek alphabet to designate artificial satellites. For example, Sputnik 1 was designated 1957α. In 1963, the system was changed to use numerals instead, but its retroactive application for ease of computerized reference was not immediate. For example, the quarterly publication TRW Space Log of 1969 had satellites orbited before 1963 listed by Greek letters and those during and after by numerals.
- NSSDC Master Catalog
- NSSDC Master Catalog Spacecraft query
- NSSDC SPACEWARN Bulletin
- US space objects registry
- UK space objects registry
- UN space objects registry
- Mirror of UN space objects registry with commentary by Jonathan McDowell of Jonathan's Space Report
- CelesTrak SATCAT search
- Gunter's Space Page
- COSPAR of the International Council for Science
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