GEO Rideshare Explained: How Small Satellites Share a Ride to Geostationary Orbit

A GEO rideshare lets several small satellites share one ride to geostationary orbit instead of each booking a heavy rocket or spending months raising its own orbit. The first dedicated service is Impulse Space's Caravan program: a Falcon 9 carries the Helios kick stage to low Earth orbit, and Helios then delivers the payloads to GEO in under 24 hours. According to Impulse, Caravan missions start in 2027, with a standard plate that includes 300 kg of payload mass. Other space tugs for GEO, such as Firefly's Elytra Dusk and Exotrail's spacevan GEO, are still in development.

This guide explains why reaching GEO has been hard for small satellites, how a GEO rideshare works, which providers exist and what to check before booking. Transfer vehicles and launchers can be compared on the Carrier Space vehicle overview, and a request can be sent via cargo transport.

Why GEO is hard to reach

A satellite about 36,000 km above the Earth's surface, 42,164 km from its centre, circles the planet exactly once a day. Over the equator it appears to stand still, which is why weather satellites such as the GOES series use geostationary orbit, as NASA's Earth Observatory explains. Getting there takes a lot of energy. Impulse Space describes the two options operators have had so far:

Heavy-lift launch directly to GEO: fast, but with a high launch fee and limited availability.
Medium-lift launch to a transfer orbit: cheaper, but the satellite then spends 6 to 9 months raising its orbit with electric propulsion, passing through a high-radiation environment.

Background on the transfer orbit is in geostationary transfer orbit explained, and the rockets that reach GEO directly are compared in launch vehicles for GEO insertion.

How a GEO rideshare works

A GEO rideshare adds a stage that does the hard part after launch. In Impulse Space's Caravan model:

Launch to LEO: a medium-lift rocket, so far a SpaceX Falcon 9, carries the kick stage with the rideshare payloads to low Earth orbit.
Transfer burn: after deployment, Helios ignites its Deneb engine, which burns liquid oxygen and liquid methane with 67 kN of thrust.
Delivery: Helios carries the payloads to GEO in less than one day and releases them at their target.

Impulse describes Caravan as an annual GEO rideshare. Helios itself is advertised for up to 4,000 kg of payload from LEO to GEO in under 24 hours, with a delta-v of 3 to 9 km/s depending on payload mass, and also serves MEO, GTO, trans-lunar injection and Earth escape.

Caravan plates and interfaces

Impulse publishes two plate types for Helios rideshare missions:

Standard plate: 300 kg included, 700 kg maximum. Payload interface 40 x 40 inches, four-point footprints of 24, 15 or 8 inches and industry-standard bolt patterns.
Tallboy plate: 700 kg included, 1,400 kg maximum. Payload interface 40 x 64 inches, four-point footprints of 31.6 or 38.81 inches.
Services on both: redundant separation signals, one 40 W heater power line (more as a non-standard service) and a breakwire.

Customers can also combine Caravan with Impulse's smaller Mira spacecraft, which can ride as one of the Helios payloads and then manoeuvre in GEO. The upgraded Mira has radiation-tolerant avionics and, according to Impulse, can reach 900 m/s of delta-v with a 100 kg payload and remain in GEO for several years.

Who has booked

Impulse has published several GEO agreements:

Infinite Orbits (France): a multi-launch agreement for its in-orbit servicing spacecraft via Caravan, with at least three spacecraft in 2027 and further missions each year.
Astranis (USA): a 2027 mission on Falcon 9 in which Helios delivers MicroGEO satellites directly to GEO.
SES (Luxembourg): a multi-launch agreement; the first mission, planned for 2027, is a dedicated Helios flight that moves a 4-ton-class satellite to GEO within eight hours of launch.

Dates have moved before. In September 2025 Impulse said its first Caravan mission was scheduled for 2026; its rideshare page now says Caravan missions start in 2027. NASA's Small Spacecraft Technology report also listed the first Helios flight as planned for 2026.

Other routes to GEO for small satellites

NASA's Small Spacecraft Technology State of the Art report lists further orbital transfer vehicles that target GEO. All of them are marked as upcoming:

Firefly Aerospace Elytra Dusk: designed for transfer from LEO to GEO.
Exotrail spacevan GEO (France): for orbits above LEO such as MEO, GEO and cislunar, with about 150 kg of payload and about 2,200 m/s of delta-v.
Epic Aerospace Chimera GEO (Argentina): from GTO to trans-lunar injection, 300 kg payload and 1,800 m/s.

Rocket Lab's Photon has flown, and NASA lists its range as LEO, MEO, GEO and beyond. A full overview is in space tug companies compared.

GEO rideshare compared with the alternatives

Dedicated heavy launch to GEO: full control over date and slot, highest cost. Suited to large GEO satellites.
GTO launch plus own orbit raising: lower launch cost, but months of transfer and radiation exposure on the way.
GEO rideshare with a kick stage: shared cost and arrival within a day, but fixed launch dates and a shared mission profile. New and without flight heritage yet.
LEO rideshare: established and flown regularly, but only for low orbits. See SpaceX rideshare explained.

What to check before booking a GEO rideshare

Target slot and inclination: where in GEO the kick stage releases you and how much your own satellite must still manoeuvre.
Flight heritage: Helios and the GEO versions of other tugs have not flown yet. Our own advice: ask about the fallback if the first flight slips.
Mass and interface: plate type, included mass, footprint and separation system.
Licensing: frequency licences take time. Plan them early, see satellite launch lead times.
End of life: retired GEO satellites move to a graveyard orbit, see graveyard orbit explained.

FAQ

Is there a rideshare to geostationary orbit?

Yes. Impulse Space offers Caravan, an annual GEO rideshare that uses its Helios kick stage after a Falcon 9 launch to LEO. According to Impulse, missions start in 2027.

How long does it take to get to GEO on a rideshare?

Impulse advertises less than one day from LEO to GEO with Helios. Electric orbit raising from a transfer orbit takes 6 to 9 months, according to Impulse.

How much mass can I book on a GEO rideshare?

Impulse lists 300 kg included on a standard plate (up to 700 kg) and 700 kg on a Tallboy plate (up to 1,400 kg).

How much does a GEO rideshare cost?

Impulse does not publish prices. Requests go through its booking page.

Which space tugs can reach GEO?

Impulse Helios, Firefly Elytra Dusk, Exotrail spacevan GEO and Epic Aerospace Chimera GEO are designed for it, according to NASA. NASA lists Rocket Lab's Photon for GEO as well.

Sources

Cover image: An inertial upper stage carrying NASA's TDRS-C relay satellite drifts away from Space Shuttle Discovery during the STS-26 mission in 1988, before boosting the satellite toward geosynchronous orbit. Credit: NASA (s26-31-071)