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SatelliteIndex

Satellite · NORAD 20401 · COSPAR 1990-001A

SKYNET 4A

UnknownPayloadGEOCommunications derived

Altitude now

—

no element set

Velocity

—

Inclination

12.47°

Period

1.0 d

1,454.5 min

Perigee

36,088km

Apogee

36,205km

orbit unavailableNo orbital element set on file.· Metadata updated 17 h ago

Live position

Live position

Live position unavailable — no public orbital element set exists for this object (it may be classified, untracked or too small to catalogue).

Mission

Mission & classification

Mission type derived
Communications
Object type
Payload
SATCAT ops status
Non-operational [-]
Radar cross-section
8.1 m²

CelesTrak groups

Not listed in any CelesTrak group.

Aliases

  • SKYNET 4ACelestrak Satcat

Ownership

Operator & country

Operator
—
SATCAT owner code
UK · United Kingdom
Country
United Kingdom GB

Launch

Launch

Launch page →
Launch date
01 Jan 1990
COSPAR launch id
1990-001
Launch site
Cape Canaveral / Kennedy Space Center (Eastern Range), Florida

Objects from the same launch · 5

Change log

History

No changes recorded since first ingestion on 11 Sept 2026 18:54 UTC. Status, orbit class, name and ownership changes are logged here as sources are re-ingested.

Regulatory

UN registration

UN Register of Objects Launched into Outer Space (UNOOSA) — connector planned, not yet ingested; registration unavailable

Transparency

Sources & provenance

All sources →

No source is linked to this record yet — the catalogue row exists but no provenance entry has been written for it.

Field provenance

No field-level provenance recorded.

Timeline

Events

All events →

No events detected for this object yet. Launches, decays and orbit changes are generated by the derived-analytics connector.

Reference

Identifiers

NORAD catalogue number
20401
COSPAR / international designator
1990-001A
SatelliteIndex id
sat_01M28X3JPCDDFH3TJ6S88RTKM5
Canonical slug
skynet-4a-20401

Orbit class, mission type and constellation membership are derived by SatelliteIndex (Communications) — see the methodology. Positions are propagated estimates, not tracking measurements; never use them for conjunction assessment.