Q: What is the purpose of GSSAP-4?

A: GSSAP-4 is a military satellite used for space surveillance, specifically monitoring objects in near-geosynchronous orbit to enhance situational awareness for the U.S. military.

Q: When was GSSAP-4 launched?

A: It was launched on August 19, 2016, aboard a Delta IV Medium+(4,2) rocket from Cape Canaveral.

Q: Who operates GSSAP-4?

A: The satellite is operated by the U.S. Combat Forces Command.

Q: What is the relationship between GSSAP-4 and other GSSAP satellites?

A: GSSAP-4 is the fourth in a series of near-geosynchronous surveillance satellites, following GSSAP-3 and preceding GSSAP-5.

Q: What is the spacecraft bus used for GSSAP-4?

A: It uses the GEOStar-1 spacecraft bus, manufactured by Orbital ATK.

GSSAP-4

American near-geosynchronous space surveillance satellite

Vehicle Military Satellite Q28668994

Facts

19 properties

Instance of: military satellite
Follows: GSSAP-3^[3]
Followed by: GSSAP-5^[4]
Launch date: 2016-08-19
Part of: Geosynchronous Space Situational Awareness Program^[6]
Has use: space surveillance^[7]
Country of origin: United States^[9]
Launch vehicle: Delta IV Medium+(4,2)
Manufacturer: Orbital ATK^[5]
Operator: Combat Forces Command^[2]
Powered by: spacecraft solar array^[10]
Satellite of: geosynchronous orbit
Significant event: rocket launch, service entry^[14]^[15]
Space launch vehicle: Delta IV Medium+(4,2)^[8]
Spacecraft bus: GEOStar-1^[13]
Start point: Cape Canaveral Space Launch Complex 37B^[16]
Type of orbit: geosynchronous orbit^[11]
UTC date of spacecraft launch: August 19, 2016^[12]
Use: space surveillance

🏷️ Also known as

en GSSAP-4 en Hornet 4 en USA-271 ru GSSAP 4

🔖 Identifiers · 5

Image (Wikimedia Commons): Geosynchronous Space Situational Awareness Program (cropped).jpg ↗
COSPAR ID: 2016-052B
Google Knowledge Graph ID: /g/11c5225d75
NSSDCA ID: 2016-052B
SCN: 41745

Report an error or request removal Lineage (PROV-JSON)

🔗 Connections

Belongs to 1

Geosynchronous Space Situational Awareness Program

Country of origin 1

United States

Followed by 1

GSSAP-5

Followed by (predecessor) 1

GSSAP-5

Follows 1

GSSAP-3

Has use 1

space surveillance

Instance of 1

military satellite

Manufacturer 1

Orbital ATK

Operator 1

Combat Forces Command

Part of 1

Geosynchronous Space Situational Awareness Program

spacecraft solar array

Preceded by (successor) 1

GSSAP-3

Significant event 1

rocket launch

Space launch vehicle 1

Delta IV Medium+(4,2)

Spacecraft bus 1

GEOStar-1

Type of orbit 1

geosynchronous orbit

Press Enter · cited answer in seconds

Summary

GSSAP-4 is a military satellite^[1].

References

Programmatic citations — every numbered marker resolves to a verifiable graph row below.

Direct Wikidata claims

[2] ↑ GSSAP-4 — operator (P137): Combat Forces Command. space.skyrocket.de. space.skyrocket.de. Provenance: wikidata.org.
[3] ↑ GSSAP-4 — follows (P155): GSSAP-3. wikidata.org.
[4] ↑ GSSAP-4 — followed by (P156): GSSAP-5. wikidata.org.
[5] ↑ GSSAP-4 — manufacturer (P176): Orbital ATK. space.skyrocket.de. space.skyrocket.de. Provenance: wikidata.org.
[6] ↑ GSSAP-4 — part of (P361): Geosynchronous Space Situational Awareness Program. wikidata.org.
[7] ↑ GSSAP-4 — has use (P366): space surveillance. wikidata.org.
[8] ↑ GSSAP-4 — space launch vehicle (P375): Delta IV Medium+(4,2). Jonathan's Space Report. wikidata.org.
[9] ↑ GSSAP-4 — country of origin (P495): United States. wikidata.org.
[10] ↑ GSSAP-4 — powered by (P516): spacecraft solar array. space.skyrocket.de. space.skyrocket.de. Provenance: wikidata.org.
[11] ↑ GSSAP-4 — type of orbit (P522): geosynchronous orbit. space.skyrocket.de. space.skyrocket.de. Provenance: wikidata.org.
[12] ↑ GSSAP-4 — UTC date of spacecraft launch (P619): August 19, 2016. Jonathan's Space Report. wikidata.org.
[13] ↑ GSSAP-4 — spacecraft bus (P707): GEOStar-1. space.skyrocket.de. space.skyrocket.de. Provenance: wikidata.org.
[14] ↑ GSSAP-4 — significant event (P793): rocket launch. Jonathan's Space Report. wikidata.org.
[15] ↑ GSSAP-4 — significant event (P793): service entry. airforcemag.com. airforcemag.com. Provenance: wikidata.org.
[16] ↑ GSSAP-4 — start point (P1427): Cape Canaveral Space Launch Complex 37B. Jonathan's Space Report. wikidata.org.

Class ancestry

[1] ↑ GSSAP-4 is an instance of military satellite (Q973887) [P31, primary]. Wikidata. wikidata.org.

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APA 4ort.xyz Knowledge Graph. (2026). GSSAP-4. Retrieved November 11, 2026, from https://4ort.xyz/entity/gssap-4

MLA “GSSAP-4.” 4ort.xyz Knowledge Graph, 4ort.xyz, 11 Nov. 2026, https://4ort.xyz/entity/gssap-4.

BibTeX

@misc{4ortxyz_gssap-4_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{GSSAP-4}}, year = {2026}, url = {https://4ort.xyz/entity/gssap-4}, note = {Accessed: 2026-11-11}}

LLM prompt

According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): GSSAP-4 — https://4ort.xyz/entity/gssap-4 (retrieved 2026-11-11)

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