| gptkbp:instanceOf | gptkb:satellite 
 | 
                        
                            
                                | gptkbp:apogee | 264 km 
 | 
                        
                            
                                | gptkbp:callsign | gptkb:Discovery 
 | 
                        
                            
                                | gptkbp:crew | gptkb:Charles_D._Gemar gptkb:Donald_R._McMonagle
 gptkb:Gregory_J._Harbaugh
 gptkb:Lacy_Veach
 gptkb:Richard_J._Hieb
 gptkb:Guion_Bluford
 gptkb:Michael_L._Coats
 7
 
 | 
                        
                            
                                | gptkbp:duration | 8 days, 7 hours, 22 minutes, 23 seconds 
 | 
                        
                            
                                | gptkbp:formerPosition | gptkb:STS-37 
 | 
                        
                            
                                | gptkbp:inclination | 57.0 degrees 
 | 
                        
                            
                                | gptkbp:landingDate | gptkb:Kennedy_Space_Center 1991-05-06
 
 | 
                        
                            
                                | gptkbp:launchDate | 1991-04-28 
 | 
                        
                            
                                | gptkbp:launchSite | gptkb:Kennedy_Space_Center_LC-39A 
 | 
                        
                            
                                | gptkbp:missionNumber | 39 
 | 
                        
                            
                                | gptkbp:missionPatch | gptkb:STS-39_mission_patch 
 | 
                        
                            
                                | gptkbp:missionType | Department of Defense mission 
 | 
                        
                            
                                | gptkbp:nextSeason | gptkb:STS-40 
 | 
                        
                            
                                | gptkbp:notableFor | First unclassified Department of Defense-dedicated mission Longest Shuttle mission at the time
 First flight of IBSS (Infrared Background Signature Survey)
 
 | 
                        
                            
                                | gptkbp:operator | gptkb:NASA 
 | 
                        
                            
                                | gptkbp:orbitsCompleted | 134 
 | 
                        
                            
                                | gptkbp:orbitType | Low Earth orbit 
 | 
                        
                            
                                | gptkbp:payload | gptkb:AFP-675 gptkb:IBSS
 
 | 
                        
                            
                                | gptkbp:perihelion | 259 km 
 | 
                        
                            
                                | gptkbp:spacecraft | gptkb:Space_Shuttle_Discovery 
 | 
                        
                            
                                | gptkbp:bfsParent | gptkb:Gregory_Harbaugh gptkb:Guion_Bluford
 
 | 
                        
                            
                                | gptkbp:bfsLayer | 6 
 | 
                        
                            
                                | https://www.w3.org/2000/01/rdf-schema#label | STS-39 
 |