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IRIDIUM 21 is no longer on orbit
IRIDIUM 21 is classified as:

NORAD ID: 25778
Int'l Code: 1999-032B
Launch date: June 11, 1999
Source: United States (US)
Launch site: Taiyaun Space Center, China (TSC)
Decay date: 2018-05-24
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NASA's NSSDC Master Catalog

Two Line Element Set (TLE):

Source of the keplerian elements: AFSPC