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The International Designator, also known as COSPAR ID, is an international identifier assigned to artificial objects in space. It consists of the launch year, a three-digit incrementing launch number of that year and up to a three-letter code representing the sequential identifier of a piece in a launch. In TLE format the first two digits of the year and the dash are dropped.
For example, 1990-037A is the Space Shuttle Discovery on mission STS-31, which carried the Hubble Space Telescope (1990-037B) into space. This launch was the 37th known successful launch worldwide in 1990.
COSPAR subsumed the first designation system, devised at Harvard University. That system used letters of the Greek alphabet to designate artificial satellites. This was based on the scientific naming convention for natural satellites. For example, Sputnik 1 was designated 1957 Alpha 2. The launch vehicle, which was brighter in orbit, was designated 1957 Alpha 1. Brighter objects in the same launch were given the lower integer number, and Alpha was given since it was the first launch of the year. The Harvard designation system continued to be used for satellites launched up to the end of 1962, when it was replaced with the modern system. The first satellite to receive a new-format designator was Luna E-6 No.2, 1963-001B, although some sources, including the NSSDC website, retroactively apply the new-format designators to older satellites, even those no longer in orbit at the time of its introduction.
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Designators are assigned to objects by USSTRATCOM along with satellite catalog numbers as they are discovered in space. The United Nations Office for Outer Space Affairs (UNOOSA) and the National Space Science Data Center (NSSDC), part of NASA, maintain two catalogs that provide additional information on the launchers and payloads associated with the designators. While UNOOSA uses COSPAR ID, the NSSDC Master Catalog (NMC) uses a closely related but not identical designator called NSSDCA ID. Below are examples of some differences:
|Satellite||NSSDCA ID||COSPAR ID||Note|
|LightSail-2||2019036AC||2019-036AC||The dash is not present|
|Sojourner||MESURPR||none||Mars Pathfinder Rover|
|Lucy||LUCY||none||Scheduled to launch on 16 October 2021|
|Space Shuttle||SHUTTLE||none||Flew 135 missions from 1981 to 2011, of which 133 returned safely.|
Spacecraft which do not complete an orbit of the Earth, for example launches which fail to achieve orbit, are not assigned IDs.
Satellites launched from the International Space Station are assigned a COSPAR ID beginning with "1998-067", because the (first module of the) space station was launched in 1998. For example, the satellite GOMX-3, launched on an H-II Transfer Vehicle on August 19, 2015, from Tanegashima Space Center in Japan, is designated COSPAR ID 1998-067HA, because it first arrived on the International Space Station from where it was later launched.
- "Frequently Asked Questions". Space-Track.org. Retrieved July 14, 2019.
Q: What criteria are used to determine whether an orbiting object should receive a catalogue number and International Designation? A: We must be able to determine who it belongs to, what launch it correlates to, and the object must be able to be maintained (tracked well).
- Kelso, T.S. (January 1998). "Frequently Asked Questions: Two-Line Element Set Format". Satellite Times. Retrieved 3 October 2019.
- McDowell, Jonathan. "Designations". JSR Launch Vehicle Database. Retrieved 3 October 2019.
- "Alpha Is Science's Tag For First of Satellites". The New York Times. November 25, 1957. p. 12.