USA 583

active

Missile Warning TrackingCOSPAR 2026-029BLaunched 2/12/2026

Admin Edit

Mission & Launch

Launch Mission: USSF-87
Launch Vehicle: Vulcan Centaur VC4S
Launch Date: 2/12/2026

Orbit & Mass

Altitude: 0 km
Inclination: 0 deg
Dry Mass: 500 kg
Total Mass: 500 kg

Payload Classification

Mission Type: Missile Warning Tracking

Payload Category

EW*

Payload Class

D

Organizations

Operator: U.S. Space Force
Manufacturer: Northrop Grumman

Constellation

Name: GSSAP
Active Satellites: 6

Registry

COSPAR ID: 2026-029B

Track

Mentions

4

All verified mentions of this spacecraft in source documents.

The GEM-63XL anomaly surfaced on Feb. 27 during the USSF-87 mission before Vulcan Centaur deployed two Northrop Grumman-built Geosynchronous Space Situational Awareness Program satellites, GSSAP 7 and GSSAP 8.

CapabilityGeneralValue 4.6Feb 26, 2026Latest News

GSSAP 7 and GSSAP 8 are also known as Hornet 7 and Hornet 8.

GeneralValue 2.0Feb 26, 2026Latest News

United Launch Alliance launched the GSSAP 7 and GSSAP 8 satellites for the United States Space Force from SLC-41, Cape Canaveral Space Force Station, Florida.

GeneralRelationshipsPlanValue 4.8Feb 12, 2026OH DEAR Not again @northropgrumman! 2 SRB nozzles falling off in 4 launches and 12 flights is uhhhhhhhhhhhhhhh.... Time to look at combined effects of the rocket on those nozzles I think - Vulcan is supposed to be *the* reliable launcher (cough)...

The U.S. Space Force has ordered two additional GSSAP satellites (GSSAP 7 and GSSAP 8) from Northrop Grumman.

RelationshipsValue 4.5Aug 15, 2023U.S. deactivates GSSAP surveillance satellite, two new ones in the works