SSO Rideshare Explained: Getting to Sun-Synchronous Orbit

An SSO rideshare is a shared launch in which many small satellites fly together on one rocket to a sun-synchronous orbit (SSO), the near-polar orbit used by most Earth observation missions. You buy a slot or a share of a mounting plate instead of a whole rocket, and in return you accept the mission's date and orbit. SpaceX says its SSO rideshare missions fly approximately every four months, and on 11 October 2026 its flight search listed two open SSO flights, targeted for June 2027 and October 2027, at 500 to 600 km altitude.

This guide explains why operators want SSO, what an SSO rideshare offers, what you can and cannot choose, and how to reach the exact orbit you need.

What makes an orbit sun-synchronous

NASA's Earth Observatory explains that many satellites in NASA's Earth Observing System fly a nearly polar orbit, and that in a sun-synchronous orbit the satellite crosses the equator at the same local solar time every time it passes. NASA's example is the Terra satellite, which always crosses the equator at about 10:30 in the morning local time. This keeps the angle of sunlight on the ground as consistent as possible, so images from the same season can be compared over years without large changes in shadows.

NASA also points out that the path a satellite must follow to stay sun-synchronous is very narrow: any deviation in height or inclination takes it out of SSO, and atmospheric drag and the gravity of the Sun and Moon mean regular adjustments are needed. Our explainer on sun-synchronous orbits covers the physics in more depth.

Why rideshare missions go to SSO

Many small satellite customers, especially in Earth observation, need the consistent lighting that SSO provides. Grouping them on one rocket lets the launch provider fill the vehicle and lets each customer pay only for its share. SpaceX lists SSO first on its rideshare page and offers frequent launches to mid-inclination orbits as well, with other orbits on request.

What an SSO rideshare slot includes

SpaceX sells rideshare capacity on plates mounted inside the Falcon 9 fairing. Its rideshare page lists four standard configurations:

Quarter plate: 8 inch bolt pattern, 50 kg included
Half plate: 8 or 15 inch bolt pattern, 100 kg included
Full plate: 15 or 24 inch bolt pattern, 200 kg included
Full plate, XL volume: 24 inch bolt pattern, 300 kg included

Larger spacecraft can request custom configurations or a "cake topper" slot. CubeSats fly in dispensers that are mounted as one integrated assembly. For current prices, see our guides to SpaceX rideshare and Falcon 9 launch costs.

The open SSO flights right now

SpaceX's public rideshare flight search returned these open flights on 11 October 2026:

Target June 2027: SSO with an inclination tolerance of ±0.1 degrees, perigee and apogee 500 to 600 km
Target October 2027: SSO with an inclination tolerance of ±0.1 degrees, perigee and apogee 500 to 600 km

Target dates can move. For all upcoming missions across providers, see our rideshare launch schedule for 2026 and 2027 and the Carrier Space mission list.

What you can and cannot choose

On a shared mission, the primary trajectory is set for the whole flight. SpaceX's Rideshare Payload User's Guide (Version 11, August 2026) says that at about five months before launch the customer selects its deployment orbit through an online form, from a list of available orbit parameters for the mission pre-populated by SpaceX. In practice, this means you pick from what the mission offers rather than defining your own orbit.

Before booking, compare the mission against your requirements:

Altitude range: does your mission work anywhere in the offered band, for example 500 to 600 km?
Local time of the orbit: imaging missions often need a specific equator crossing time. Check what the mission will offer before you commit.
Launch window: SpaceX notes that launch window times are developed specifically for each mission.
Readiness date: your satellite must be delivered and processed before the mission flies. SpaceX's typical rideshare schedule starts eight months before launch.
Delay rules: if your payload is late, SpaceX lets you apply 100% of the money paid to a future mission, subject to a 5 to 10% rebooking fee.

Getting from the rideshare orbit to your orbit

If the rideshare orbit is close but not exact, there are two common options:

Orbital transfer vehicle: a space tug rides on the rideshare mission and then delivers its passengers to individual orbits. Our comparison of space tug companies lists the providers.
Onboard propulsion: a satellite with its own thruster can adjust altitude and phasing after separation.

If neither works, a dedicated small launcher may be the better fit, at a higher price per kilogram. We compare both approaches in rideshare vs dedicated launch.

Licensing and orbit rules that matter for SSO

Altitude and the FCC streamlined process: the FCC's streamlined small satellite process (47 CFR 25.122) requires deployment at or below 600 km unless the satellite has propulsion for collision avoidance and deorbit. A 500 to 600 km SSO rideshare falls within that limit.
Disposal: SpaceX expects all rideshare payloads to follow the FCC rule requiring disposal no later than 5 years after the mission ends.
Registration: customers must register all deployed objects with the 18th Space Defense Squadron no later than two months before launch.
Tracking: SpaceX provides a best-estimate separation state vector, but the customer is responsible for tracking and contacting its payload. Because many satellites separate into similar orbits on an SSO rideshare, SpaceX notes that customer-published ephemerides speed up cataloging and help every operator identify its own satellite.

FAQ

How often are SSO rideshare missions?

SpaceX says its SSO rideshare missions fly approximately every four months. On 11 October 2026, its flight search listed open SSO flights targeted for June 2027 and October 2027.

What altitude does an SSO rideshare go to?

It depends on the mission. Both open SpaceX SSO flights listed on 11 October 2026 offer perigee and apogee between 500 and 600 km.

Can I choose my exact orbit on a rideshare?

Only within the mission's options. SpaceX customers select a deployment orbit about five months before launch from a list of parameters set by SpaceX. For a different orbit, use a space tug, onboard propulsion or a dedicated launch.

Is SSO the same as a polar orbit?

Not exactly. A sun-synchronous orbit is a nearly polar orbit, but NASA notes that the path a satellite must follow to stay sun-synchronous is very narrow: only the right combination of altitude and inclination keeps the equator crossing at the same local solar time.

How early do I need to book an SSO rideshare?

SpaceX's typical schedule begins with mission analysis inputs eight months before launch, so a booking needs to be in place before that. Our guide to launch lead times covers the full timeline.

Looking for an SSO slot? Compare missions and vehicles on Carrier Space, or describe your mass, orbit and readiness date in a free request.

Sources

Cover image: NASA Landsat 9 Project Scientist Jeff Masek next to the Atlas V rocket carrying the Landsat 9 Earth observation satellite, at Vandenberg Space Force Base, California, 26 September 2021. Credit: NASA/Bill Ingalls (NHQ202109260007).