ABOUT MOLNIYA ORBIT
The Molniya Orbit is a highly elliptical orbit with a 12-hour period, 63.4-degree inclination, and an apogee over the Northern Hemisphere. This specific inclination eliminates apsidal precession, keeping the apogee fixed over high latitudes. It was developed by the Soviet Union to provide communications coverage over Russia and the Arctic.
ORBITAL PARAMETERS
| Altitude (Min) | 500 km |
| Altitude (Max) | 39,874 km |
| Inclination | 63.4° |
| Orbital Period | 720 minutes |
| Orbital Velocity | 10.0 km/s |
| Delta-V Required | 9.6 km/s |
| Eccentricity | 0.74 |
| Category | Highly Elliptical |
EQUATION / FORMULA
Critical inclination: i = 63.4° (cos²i = 1/5)
ADVANTAGES & DISADVANTAGES
ADVANTAGES
Extended dwell time over high latitudes, covers polar regions GEO cannot, proven technology
DISADVANTAGES
Passes through Van Allen belts twice per orbit, requires constellation of three for continuous coverage
HISTORY
| Discoverer / Pioneer | Soviet space program (1964) |
| First Use | April 23, 1965 |
ALTITUDE CONVERSIONS (MIN)
| Kilometers | 500 km |
| Miles | 311 mi |
| Nautical Miles | 270 nmi |
TYPICAL PAYLOADS (3)
SATELLITE CONSTELLATIONS (2)
