Final flight of the Pegasus XL
The Pegasus XL launch vehicle, operated by Northrop Grumman Innovation Systems, lifted off today carrying a reboost payload for NASA's astrophysics satellite Swift. The rocket was air‑launched from a Lockheed C‑130 aircraft, following the system's standard procedure.
Mission objective
The aim was to raise Swift's orbit, extending the spacecraft's operational life and improving its ability to observe high‑energy phenomena such as gamma‑ray bursts and X‑ray sources. An increased altitude enhances the satellite's scientific return.
Technical sequence
After separation from the carrier aircraft, the two‑stage Pegasus XL ignited its solid and liquid propellant motors, reached the designated altitude and deployed the payload adapter. The reboost module then attached to Swift and fired its thrusters, delivering the required velocity change.
Future perspective
While this may be the Pegasus XL's last launch, the successful maneuver showcases the potential of on‑orbit servicing to extend the usefulness of aging satellites. NASA will review the performance data to refine future reboost strategies.