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Skynet 4E
British military communications satellite. Skynet 4E was launched on February 26, 1999 aboard a Ariane 44L from Kourou. Latest status in GCAT: renamed (Oct 24, 2003).
COSPAR 1999-009BNORAD 25639United Kingdom
Identity
- Name in GCAT
- Skynet 4E
- International designator
- 1999-009B
- NORAD catalog number
- 25639
- GCAT identifier
- S25639
- UN registration
- ST/SG/SER.E/378
Mission
- Mission type
- Communications
- Use
- Defense
- Program
- Skynet
- Owner
- UK MoD
- Country
- United Kingdom
- Builder
- Matra Marconi Space (Stevenage)
- Platform (bus)
- ECS
Launch
- Date
- February 26, 1999 · 22:44 UTC
- Launch record
- 1999-009Success
- Rocket
- Ariane 44L
- Spaceport
- Kourou · pad ELA2
Orbit and fate
- Orbit class (GCAT)
- GEO/NS
- Perigee
- 31,657 km
- Apogee
- 39,130 km
- Inclination
- 3.35°
- Status
- Renamed
- Status date
- October 24, 2003
- Last known active
- Dec 3, 2025
- End of operations
- Dec 4, 2025
Size
- Mass
- 823 kg
- Dry mass
- 719 kg
- Total mass with attached objects
- 1,490 kg
- Length
- 2.1 m
- Diameter
- 1.90 m
- Span
- 16.0 m
Launched together
Source: GCAT payload, deep-space and lander catalogs, Jonathan C. McDowell (CC BY 4.0); Wikidata Q16943243 (CC0).