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    HELIOS 1B
            Launch Details
            
                
        
                    | Launched | 2 December 1999 | 
| Flight ended | – | 
| Status | Non-operational | 
| Category | 
                                                            
                                    Assorted bright                                
                                 | 
                    
| Launch site | Europe's Spaceport, Kourou, French Guiana | 
| Owner | France | 
| NORAD ID | 25977 | 
| COSPAR ID | 1999-064A | 
| Observing | 
Current orbital elements
| Inclination | 98.176° | 
| Eccentricity | 0.00025 | 
| RA ascending node | 13.327 hr | 
| Argument perigee | 97.786° | 
| Mean anomaly | 262.364° | 
| Orbital period | 96.837 min | 
| Epoch of osculation | 02 Nov 2025, 10:24 | 
Derived Quantities
| Min Altitude | 612.6 km | 
| Mean Altitude | 614.4 km | 
| Peak Altitude | 616.1 km | 
Orbital History
Drag the graphs below left or right to change the time range, or use your scroll wheel to zoom in or out.