PExT was hosted on the York Space Bard spacecraft, which SpaceX launched in July alongside the NASA Tracers mission.
SpaceX's launches in 2023 for NASA included SPHEREx/PUNCH, TRACERS, and IMAP/SWFO-L1/Carruthers.
The first stage booster previously launched Crew-7, CRS-29, PACE, Transporter-10, EarthCARE, NROL-186, Transporter-13, TRACERS, and nine Starlink missions.
After instrument integration, Millennium Space Systems will perform environmental testing and deliver the TRACERS spacecraft to Vandenberg Space Force Base for a projected 2025 launch on a SpaceX Falcon 9 to sun-synchronous orbit.
Millennium Space Systems received a contract in 2019 to develop and integrate two identical satellites for TRACERS.
NASA selected SpaceX of Hawthorne, California and its Falcon 9 rocket to provide the launch service for the agency’s TRACERS mission.
TRACERS was selected in 2019 as a heliophysics Small Explorer (SMEX) mission with a cost cap of no more than $115,000,000.