Satellite orbit types explained
Altitude decides almost everything about a satellite service: latency, how much of the Earth one satellite sees, how fast it moves across the sky, and how many satellites you need.
LEO (Low Earth Orbit)
Closest major orbit band to Earth with low latency and fast-moving satellites.
- Altitude
- ~160 to 2,000 km
- Orbital period
- ~90 to 130 minutes
- Latency
- ~25-60 ms RTT (typical service range)
- Coverage
- Smaller footprint per satellite, many satellites needed for persistent global service
- Motion
- Fast apparent motion; frequent handovers
- Used for
- Broadband constellations, Earth observation, some NTN mobility services.
- Common bands
- Ku-band, Ka-band, L-band, S-band, Optical (ISL)
Strengths: Low latency; High aggregate constellation capacity.
Trade-offs: Complex handovers; High constellation deployment and operations complexity.
MEO (Medium Earth Orbit)
Middle-altitude regime balancing coverage footprint and latency.
- Altitude
- ~2,000 to 35,786 km
- Orbital period
- ~2 to 24 hours
- Latency
- ~120-150 ms RTT (communications MEO, operator-reported)
- Coverage
- Larger footprint than LEO, fewer satellites than LEO for regional/global service
- Motion
- Slower apparent motion than LEO; handovers still required
- Used for
- Navigation systems and selected communications constellations.
- Common bands
- Ku-band, Ka-band, L-band
Strengths: Balanced latency and coverage; Smaller constellation than LEO for similar regions.
Trade-offs: Still needs tracking/handover; Less ubiquitous ecosystem than GEO/LEO.
GEO (Geostationary Orbit)
Satellite appears fixed over one point on Earth when in equatorial circular orbit.
- Altitude
- ~35,786 km (equatorial)
- Orbital period
- ~24 hours
- Latency
- ~550-700 ms RTT (with ~477 ms propagation floor)
- Coverage
- Very wide regional footprint; a few satellites can cover most inhabited regions
- Motion
- Appears fixed from ground; no user-side handover for fixed terminals
- Used for
- Broadcast, wide-area trunking, fixed broadband, enterprise backhaul.
- Common bands
- C-band, Ku-band, Ka-band, L-band (services)
Strengths: Operational simplicity for fixed links; Large stable coverage beams.
Trade-offs: Higher latency; Lower elevation at high latitudes.
GSO (Geosynchronous Orbit)
Any orbit with a 24-hour period; GEO is a special case of GSO.
- Altitude
- ~35,786 km class
- Orbital period
- ~24 hours
- Latency
- ~550-700+ ms RTT (geometry dependent, GEO-class)
- Coverage
- Ground track may vary by inclination/eccentricity
- Motion
- May appear to trace patterns (analemma) if not geostationary
- Used for
- Specialized long-dwell regional communications designs.
- Common bands
- C-band, Ku-band, Ka-band
Strengths: Daily repeat geometry; Flexible regional dwell design.
Trade-offs: Potential tracking needs if not stationary; Niche design/operations complexity.
HEO (Highly Elliptical Orbit)
Elliptical orbit providing long dwell time over selected regions.
- Altitude
- Varies widely (elliptical)
- Orbital period
- Often ~12 or ~24 hours
- Latency
- ~120-300+ ms RTT (position and geometry dependent)
- Coverage
- Long dwell over target latitudes around apogee
- Motion
- Rapid motion near perigee, slower at apogee
- Used for
- High-latitude communications and regional coverage strategies.
- Common bands
- L-band, UHF, X-band, Ka-band
Strengths: Excellent high-latitude visibility; Regional dwell control.
Trade-offs: Variable link budgets; Complex planning and tracking.
Molniya Orbit
A specific HEO profile optimized for long visibility over northern latitudes.
- Altitude
- Highly elliptical, high apogee
- Orbital period
- ~12 hours
- Latency
- ~120-250 ms RTT during dwell windows (variable)
- Coverage
- Long dwell over northern hemisphere target areas
- Motion
- Predictable repeating dwell windows with high-latitude emphasis
- Used for
- Regional communications where GEO elevation is poor.
- Common bands
- L-band, UHF, X-band
Strengths: Strong polar and northern coverage utility.
Trade-offs: Not global one-satellite solution; Ground operations are schedule-aware.
Tundra Orbit
Another HEO profile with long regional dwell and daily ground-track repeat.
- Altitude
- Highly elliptical, high apogee
- Orbital period
- ~24 hours
- Latency
- ~150-300 ms RTT during dwell windows (variable)
- Coverage
- Long repeatable dwell over designated regions
- Motion
- Daily repeating geometry
- Used for
- Persistent regional communications and broadcast coverage.
- Common bands
- L-band, X-band, Ka-band
Strengths: Daily repeat for operations planning; Useful regional persistence.
Trade-offs: Complex orbital design and control; Limited mainstream commercial usage.
Polar Orbit
Near 90-degree inclination orbit passing close to both poles each revolution.
- Altitude
- Usually LEO
- Orbital period
- Depends on altitude
- Latency
- ~25-60 ms RTT (if used for communications)
- Coverage
- Global surface coverage over time including polar regions
- Motion
- Rapid pass-to-pass ground track progression
- Used for
- Global coverage mapping, Earth observation, and reconnaissance.
- Common bands
- X-band, S-band, Ka-band (downlink), Optical
Strengths: True global revisit potential.
Trade-offs: Not always ideal for continuous fixed-point communications without constellation scale.
SSO (Sun-Synchronous Orbit)
Near-polar LEO that keeps consistent local solar time on each pass.
- Altitude
- Usually ~500 to 900 km
- Orbital period
- ~95 to 105 minutes
- Latency
- ~25-60 ms RTT (if communications payload is present)
- Coverage
- Global revisit with consistent lighting geometry
- Motion
- Precessing orbit synchronized with sun-relative timing
- Used for
- Imaging and environmental monitoring with repeatable lighting conditions.
- Common bands
- X-band, S-band, Ka-band, Optical
Strengths: Consistent illumination for imaging analytics.
Trade-offs: Primarily EO-focused, not a default communications orbit for all services.
Equatorial LEO
Low-inclination LEO focusing capacity around equatorial and mid-latitude belts.
- Altitude
- LEO range
- Orbital period
- LEO range
- Latency
- ~25-60 ms RTT (LEO-class)
- Coverage
- Strong service density around low latitudes with reduced polar focus
- Motion
- Fast LEO movement with lower latitude coverage bias
- Used for
- Regional communications optimization and capacity concentration.
- Common bands
- Ku-band, Ka-band, L-band
Strengths: Capacity concentration where demand exists.
Trade-offs: Limited polar and high-latitude performance.
GTO (Geostationary Transfer Orbit)
Transfer orbit used to move satellites from launch orbit toward GEO service orbit.
- Altitude
- Elliptical transfer from LEO to GEO
- Orbital period
- Transfer phase dependent
- Latency
- N/A (transfer orbit, not stable service)
- Coverage
- Transitional geometry during orbit raising
- Motion
- Highly dynamic transfer trajectory
- Used for
- Launch and orbit-raising operations rather than steady-state service.
- Common bands
- TT&C bands (mission-specific)
Strengths: Efficient path to GEO injection and orbit raising.
Trade-offs: Not a steady operational service orbit.
Graveyard / Disposal Orbit
Post-mission orbit used to reduce interference risk with active service slots.
- Altitude
- Above GEO (for GEO disposal)
- Orbital period
- Near GEO class
- Latency
- N/A (disposal orbit)
- Coverage
- Not used for commercial/user service delivery
- Motion
- Post-mission disposal position
- Used for
- End-of-life disposal and long-term debris mitigation.
- Common bands
- Not service-applicable
Strengths: Reduces collision/interference risk for active GEO fleet.
Trade-offs: No direct service utility.