GSSAP

The Geosynchronous Space Situational Awareness Program is a U.S. Space Force constellation of maneuverable near-GEO inspector satellites used to observe, characterize and track resident space objects.

Overview

GSSAP is a U.S. Space Force space-domain-awareness constellation operating in the near-geosynchronous orbit regime. Its satellites, commonly nicknamed "Hornet" spacecraft, maneuver near resident space objects to collect close-range characterization data that complements ground-based radars and optical sensors. The Space Force describes the mission as improving orbital prediction, anomaly resolution, collision avoidance and attribution of activity in the GEO belt, where military communications, missile-warning and intelligence satellites are concentrated U.S. Space Force.

Unlike a conventional strike system, GSSAP is not publicly described as carrying weapons. Its military value lies in surveillance, proximity inspection and strategic signaling: it gives U.S. operators a persistent, maneuverable observer inside the same orbital neighborhood as high-value foreign satellites. Air & Space Forces Magazine identifies the program as one of the Space Force's "neighborhood watch" capabilities for geosynchronous orbit, with eight satellites launched by 2026 and one retired to a graveyard orbit Air & Space Forces Magazine.

Development

GSSAP began as a classified Air Force Space Command program and was publicly disclosed in February 2014 by Gen. William Shelton, then commander of Air Force Space Command, shortly before the first launch Space.com. The first pair, GSSAP 1 and 2, launched on 28 July 2014 from Cape Canaveral Air Force Station aboard a Delta IV M+(4,2) on the AFSPC-4 mission; the program reached Initial Operational Capability on 29 September 2015, according to the Space Force fact sheet U.S. Space Force.

The second pair, GSSAP 3 and 4, launched in August 2016 and entered operational service in September 2017. GSSAP 5 and 6 launched in January 2022 aboard an Atlas V after a roughly five-month delay Via Satellite. GSSAP 2 was decommissioned on 2 August 2023 and moved to a graveyard orbit, the first publicly reported retirement from the constellation SpaceNews. GSSAP 7 and 8 launched on 12 February 2026 aboard United Launch Alliance's Vulcan Centaur on mission USSF-87 ClearanceJobs.

The original spacecraft were built by Orbital Sciences Corporation, later Orbital ATK and then Northrop Grumman after its 2018 acquisition of Orbital ATK. eoPortal and Air & Space Forces Magazine both trace the program through that contractor lineage, while current reporting credits Northrop Grumman Space Systems as the continuing industrial base for the GSSAP family eoPortal Directory.

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