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Helios

Quickly and affordably move your payload from LEO (300km) to MEO, GEO, and beyond. Flights starting 2026.


Fly with Helios

Hardware

Meet Helios

The next-generation high-energy kick stage that economically delivers large payloads from LEO to GEO and beyond.

Helios Hardware
In-house engine development

In-house engine development

In-house tank manufacturing

In-house tank manufacturing

In-house vehicle integration

In-house vehicle integration

Services

Access GEO and Beyond

5+ Tons From LEO to GEO in under one day
5+ Tons From LEO to GEO in under one day
Gets you to GEO, now. Flexible interfaces allow for payloads of all sizes.
The Most Affordable Way to GEO and Beyond
The Most Affordable Way to GEO and Beyond
Paired with a low-cost LEO launch, Helios is the most economical way to reach our inner solar system.
Launcher Agnostic and Ready for the Super-heavy Future
Launcher Agnostic and Ready for the Super-heavy Future
Designed for Starship, Falcon 9, Falcon Heavy, Terran-R, New Glenn, and Vulcan.
Rideshare Options Starting 2026
Rideshare Options Starting 2026
Get in touch to learn more about our limited early-adopter program.
Access Other Worlds
Access Other Worlds
Helios is your ride to GEO, the Moon, Mars, and beyond.
End-to-End Customer Service
End-to-End Customer Service
We help with mission design, launch procurement, acceptance testing, accelerating schedules, export, insurance, launch support, and all on-orbit operations.

Propulsion

A Legacy of Reliability

Meet Helios’ main engine, Deneb. Designed by Tom Mueller, the engineer responsible for the most reliable rocket engine in history.

Deneb Engine
  • Liquid methane / liquid oxygen (Methalox)
  • 15,000 lbf (67 kN) thrust
  • Staged Combustion Cycle
  • Turbopump with single shaft, dual impeller
  • Impulse designed and produced valves
  • Torch ignition
  • Restart capable for multi-burn missions

Specifications

Any Orbit, Any Payload

Specification
GEO
4,000 kg* 4,500 kg‡
GTO
7,500kg* 10,500 kg‡
MEO – 20,000 km
5,500 kg* 6,500 kg‡
TLI (Lunar Transfer)
6,000 kg* 7,500 kg‡
Earth Escape (Mars Transfer)
4,500 kg* 5,500 kg‡

* Assumes launch to LEO (300km circular) on SpaceX F9-5500 (Reusable)
‡ Assumes launch to LEO (300km circular) on Relativity Terran R (Reusable)
For additional questions, contact sales@impulsespace.com

Download Helios PDF Overview
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