The photon Pathstone mission is also intended to operate on orbit to build spacecraft heritage before NASA’s Lunar Photon mission to the Moon in 2021, as a risk reduction demonstration.
| Name of Satellite | Photon Pathstone |
| Purpose | Technology Development |
| Contractor | Rocket Labs |
| Country of Contractor | New Zealand |
| Launch Mass (kg.) | 20 |
| Class of Orbit | LEO |
| Perigee (km) | 448 |
| Date of Launch | 22.03.2021 |
| Launch Site | Rocket Lab Launch Complex 1 |
| Launch Vehicle | Electron |
| COSPAR Number | 2021-023H |
| NORAD Number | 47972 |
Photon Pathstone was launched on 22 March 2021 as part of the 19th Electron mission, marking a second official test.
