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LEO Express 3

active
Technology DemonstrationLEOCOSPAR 2025-276CYLaunched 11/28/2025
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Mission & Launch
Launch Mission
Transporter-15
Launch Vehicle
Falcon 9 FT5
Launch Date
11/28/2025
Orbit & Mass
Orbit Class
LEO
Altitude
511.5 km
Inclination
97.44 deg
Dry Mass
200 kg
Total Mass
250 kg
Payload Classification
Mission Type
Technology Demonstration
Payload Category
TECH
Payload Class
B
Organizations
Operator
Impulse Space
Manufacturer
Impulse Space
Registry
COSPAR ID
2025-276CY
Track
Mentions
24
All verified mentions of this spacecraft in source documents.
0.0-5.0
Actions

Customer payload deployments have begun on the LEO Express 3 Mission.

PlanGeneralValue 3.2Jan 6, 2026RT by @Cosmic_Penguin: On-Orbit Update: Vehicle commissioning is underway and customer payload deployments have begun on the LEO Express 3 Mission. After separation from the launch vehicle, our team used new, Impulse-built radios to make contact with Mira. The spacecraft autonomously deployed its new dual solar arrays and established a sun-pointing attitude and power-positive state. During the initial phase of our commissioning process, Mira’s star trackers produced noisier measurements than expected, leading to higher RCS propellant expenditure than desired for this phase of the mission. After detecting this trend, our team pivoted to an alternate attitude control scheme and is continuing to proceed through additional commissioning activities. Having expended the majority of the nitrous oxide as a result of the incident, Mira will not be able to perform main thruster burns. We’ve also begun LEO Express 3 customer missions, with 2 of 3 FOSSASats successfully deployed into their target orbits. Mira remains in a stable, sun-pointed and power-positive state. Read the full update here: https://www.impulsespace.com/updates/leo-express-3-mission-updates
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Vehicle commissioning is underway for the LEO Express 3 Mission.

PlanGeneralValue 2.2Jan 6, 2026RT by @Cosmic_Penguin: On-Orbit Update: Vehicle commissioning is underway and customer payload deployments have begun on the LEO Express 3 Mission. After separation from the launch vehicle, our team used new, Impulse-built radios to make contact with Mira. The spacecraft autonomously deployed its new dual solar arrays and established a sun-pointing attitude and power-positive state. During the initial phase of our commissioning process, Mira’s star trackers produced noisier measurements than expected, leading to higher RCS propellant expenditure than desired for this phase of the mission. After detecting this trend, our team pivoted to an alternate attitude control scheme and is continuing to proceed through additional commissioning activities. Having expended the majority of the nitrous oxide as a result of the incident, Mira will not be able to perform main thruster burns. We’ve also begun LEO Express 3 customer missions, with 2 of 3 FOSSASats successfully deployed into their target orbits. Mira remains in a stable, sun-pointed and power-positive state. Read the full update here: https://www.impulsespace.com/updates/leo-express-3-mission-updates

LEO Express 3 will validate Mira’s improved systems and provide flight heritage for future Helios flights.

PlanCapabilityValue 3.7Nov 16, 2025Easing Regulations for Satellite Licensing

The LEO Express 3 mission is the third flight for the Mira spacecraft developed by Impulse Space.

PlanGeneralValue 2.3Nov 16, 2025Easing Regulations for Satellite Licensing

LEO Express 3 is a payload to be launched with SpaceX aboard Transporter 15.

PlanRelationshipsValue 4.0Nov 16, 2025Easing Regulations for Satellite Licensing

Impulse Space's LEO Express 3 will be the third flight for Mira, the company's high-thrust, highly maneuverable spacecraft.

CapabilityPlanValue 3.2Nov 10, 2025Impulse Space’s LEO Express 3 mission updates

LEO Express 3 will validate Mira's improved systems ahead of future missions, including GEO flights beginning in 2026.

PlanCapabilityValue 4.0Nov 10, 2025Impulse Space’s LEO Express 3 mission updates

LEO Express 3 will provide flight heritage for multiple avionics components for future Helios flights.

CapabilityPlanValue 3.5Nov 10, 2025Impulse Space’s LEO Express 3 mission updates

LEO Express 3 marks the third flight for Mira, a high-thrust, highly maneuverable spacecraft developed by Impulse Space.

CapabilityPlanValue 3.3Nov 10, 2025LEO Express Mission 3 Ready for Launch

LEO Express 3 is the first mission for the upgraded vehicle design of Mira.

CapabilityPlanValue 3.0Nov 10, 2025LEO Express Mission 3 Ready for Launch

The LEO Express 3 mission is set to launch aboard the SpaceX Transporter 15 mission.

PlanGeneralValue 4.0Nov 10, 2025LEO Express Mission 3 Ready for Launch

LEO Express 3 will be the first mission for the upgraded Mira vehicle design.

PlanCapabilityGeneralValue 3.0Nov 10, 2025Impulse Space’s LEO Express 3 mission updates

Impulse Space, Inc. will perform in-space services with its LEO Express-2 and LEO Express-3 missions.

CapabilityValue 3.0Aug 7, 2023Impulse Space: The LEO Express-2 + LEO Express-3 missions

LEO Express-2 and LEO Express-3 will launch on SpaceX Transporter rideshare missions similar to LEO Express-1.

PlanValue 4.0Aug 7, 2023Impulse Space: The LEO Express-2 + LEO Express-3 missions

LEO Express-2 and LEO Express-3 will provide payload hosting, last-mile orbital delivery, constellation deployment, low-altitude maneuvers, and controlled atmospheric re-entry.

CapabilityPlanValue 4.0Aug 7, 2023Impulse Space: The LEO Express-2 + LEO Express-3 missions

LEO Express-2 and LEO Express-3 will use the same Mira vehicle used in the previously announced LEO Express-1 mission.

PlanCapabilityValue 4.0Aug 7, 2023Impulse Space: The LEO Express-2 + LEO Express-3 missions

Impulse Space will operate LEO Express-2 and LEO Express-3 missions for in-space transportation services in the inner solar system.

GeneralCapabilityPlanValue 3.6Aug 1, 2023Impulse Space Announces its Upcoming LEO Express-2 and LEO Express-3 Missions

LEO Express-2 and LEO Express-3 will perform in-space services including payload hosting, last-mile orbital delivery, constellation deployment, low-altitude maneuvers, and controlled atmospheric re-entry.

CapabilityPlanValue 4.2Aug 1, 2023Impulse Space Announces its Upcoming LEO Express-2 and LEO Express-3 Missions

LEO Express-3 will launch on a SpaceX Transporter rideshare mission.

PlanValue 4.0Aug 1, 2023Impulse Space Announces its Upcoming LEO Express-2 and LEO Express-3 Missions

LEO Express-2 and LEO Express-3 will utilize the Mira vehicle that is being used for the LEO Express-1 mission.

PlanCapabilityValue 3.0Aug 1, 2023Impulse Space Announces its Upcoming LEO Express-2 and LEO Express-3 Missions