STS 39 DEB
| Launched | 27 April 1991 | 
| Flight ended | 11 May 1991 | 
| Status | Decayed | 
| Launch site | Air Force Eastern Test Range, Florida, USA | 
| Owner | United States | 
| NORAD ID | 21246 | 
| COSPAR ID | 1991-031E | 
| Alternative names | 
                                                            CRO-B                                 | 
                    
| Observing |