Understanding the four major types of satellite orbits and how each supports modern space technology.

Modern satellites operate in different orbits depending on their mission — from providing GPS signals, to studying the Earth, to enabling global communications. These orbits are broadly classified as LEO, MEO, GEO, and HEO.
Each orbit has a unique altitude, speed, coverage area, and application.

In this illustrated guide, let’s break down the differences in the simplest way possible.

1. LEO – Low Earth Orbit

Altitude: ~160 km to 2,000 km
Orbital Period: 90–120 minutes
Speed: ~7.8 km/s
Coverage: Small regional coverage per pass

What LEO Looks Like (Illustrated)

Imagine a satellite zooming very close to Earth. You can see curvature clearly, and it circles the planet about 16 times per day.

Key Features

• Fastest-moving orbit
• Best for high-resolution images
• Frequent coverage of different areas as Earth rotates

Examples

• ISS (International Space Station)
• Earth observation satellites
• Starlink broadband constellation
• Radar imaging satellites

Advantages

• Low latency (great for internet services)
• Reduced launch cost due to low altitude
• High image resolution

Limitations

• Small coverage area
• Satellites need constant repositioning or replacement (drag, orbital decay)

2. MEO – Medium Earth Orbit

Altitude: ~2,000 km to 20,000 km
Orbital Period: 2–12 hours
Coverage: Larger regional coverage

What MEO Looks Like (Illustrated)

A mid-altitude orbit – clearly higher than LEO but not extremely far. Satellites appear slower relative to Earth.

Key Features

• Balance between coverage and signal delay
• Higher lifespan than LEO satellites

Examples

• GPS (USA)
• GLONASS (Russia)
• Galileo (Europe)
• Navigation and timing satellites

Advantages

• Wide coverage with fewer satellites
• Stable orbits with low drag
• Ideal for navigation systems

Limitations

• Higher latency vs LEO
• More expensive than LEO launches

3. GEO – Geostationary Orbit

Altitude: ~35,786 km
Orbital Period: 24 hours (matches Earth’s rotation)
Coverage: One-third of Earth per satellite

What GEO Looks Like (Illustrated)

A satellite appearing fixed over the same spot on Earth – like a “space tower”.
It forms a ring above the equator called the Clarke Belt.

Key Features

• Earth-synchronized orbit
• Ideal for continuous coverage of the same region
• Only three GEO satellites needed for near-global coverage

Examples

• Weather satellites (INSAT, GOES)
• Communication satellites (TV, DTH, broadband)
• Military communication satellites

Advantages

• Constant coverage of one region
• Excellent for broadcasting, telecom, and weather monitoring
• Long lifespan (10–15 years)

Limitations

• Highest latency (~600–700 ms)
• Very high launch cost
• Only good for equatorial region coverage
• Poor for polar coverage

4. HEO – Highly Elliptical Orbit

Altitude: Highly variable

• Perigee: ~500–1,000 km
• Apogee: ~40,000 km or more
  Orbital Period: 12 hours typical
  Coverage: Long dwell time over polar regions

What HEO Looks Like (Illustrated)

A stretched, oval-shaped orbit with one side very close to Earth and the other extremely far.
The satellite spends most of its time over one hemisphere.

Key Features

• Ideal for polar coverage (where GEO cannot reach)
• Long “hang time” over target areas
• Used for continuous communications in high-latitude countries

Examples

• Molniya orbit (Russia)
• Tundra orbit
• Arctic communication satellites
• Early warning / missile detection satellites

Advantages

• Excellent for Arctic regions
• High visibility time over specific areas
• Lower launch energy than GEO for equivalent coverage

Limitations

• Complex ground tracking
• Radiation exposure during passes
• Requires constellation for continuous coverage

Tabular Comparison: LEO vs MEO vs GEO vs HEO

Orbit	Altitude	Orbital Period	Coverage	Best For	Examples
LEO	160–2,000 km	90–120 min	Small	Imaging, Broadband, ISS	Starlink, Earth Observation
MEO	2,000–20,000 km	2–12 hrs	Regional	Navigation, timing	GPS, Galileo
GEO	35,786 km	24 hrs	One region continuously	Weather, TV, Communication	INSAT, GOES
HEO	Elliptical	Varies	Polar-focused	Polar comms, military	Molniya, Tundra

Which Orbit Is Best for Which Mission?

Communication: GEO (TV, Satellite Internet) + LEO (High-speed broadband)

Navigation: MEO (GPS, GLONASS, Galileo)

Earth Observation: LEO (closest distance → high resolution)

Polar Coverage: HEO (Molniya/Tundra)

Scientific Research: LEO & HEO (depending on mission)

Conclusion

Each orbit – LEO, MEO, GEO, and HEO – serves a unique purpose in space missions.
From internet constellations in LEO to navigation in MEO, broadcasting in GEO, and polar coverage through HEO, every orbit is essential for powering our modern world.