Satellite · NORAD 20547 · COSPAR 1990-028B
USA 55
- Operator National Reconnaissance Office
- Constellation USA (classified US military payloads)
- Country United States
Altitude now
—
no element set
Velocity
—
Inclination
94.10°
Period
93.2 min
93.2 min
Perigee
394km
Apogee
469km
orbit unavailableNo orbital element set on file.· Metadata updated 12 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
- Military
- Object type
- Payload
- Radar cross-section
- 0.2 m²
- Constellation membership derived
- USA (classified US military payloads) via name_pattern
CelesTrak groups
Not listed in any CelesTrak group.
Aliases
- USA 55Celestrak Satcat
Ownership
Operator & country
- Operator
- National Reconnaissance Office
- SATCAT owner code
- US · United States
- Country
- United States US
Launch
Launch
- Launch date
- 05 Apr 1990
- COSPAR launch id
- 1990-028
Objects from the same launch · 1
- PEGSAT20546PayloadDecayed
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
Transparency
Sources & provenance
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
No events detected for this object yet. Launches, decays and orbit changes are generated by the derived-analytics connector.
Reference
Identifiers
- NORAD catalogue number
- 20547
- COSPAR / international designator
- 1990-028B
- SatelliteIndex id
- sat_01M28X3JPDAP3BK987B7WYXRQ6
- Canonical slug
- usa-55-20547
Orbit class, mission type and constellation membership are derived by SatelliteIndex (Military) — see the methodology. Positions are propagated estimates, not tracking measurements; never use them for conjunction assessment.