STSS DEMO 2
| Launched | 24 September 2009 |
| Flight ended | – |
| Status | Non-operational |
| Launch site | Air Force Eastern Test Range, Florida, USA |
| Owner | United States |
| NORAD ID | 35938 |
| COSPAR ID | 2009-052B |
| Alternative names |
USA 209 |
| Observing |