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SatelliteIndex

Transparency

Data sources

Where every number on SatelliteIndex comes from: the upstream catalogs, their licenses and attribution requirements, how often we sync them and how fresh each feed is right now. Nothing is presented without provenance.

Live connector health: /status/data · How data is processed: /methodology· generated 11 Sept 2026 20:37 UTC

Active

3 sources feeding the index

CelesTrak

Scientificorbital fresh
Website
celestrak.org
License
Free for non-commercial and commercial use with attribution (CelesTrak terms)
Attribution
Orbital data courtesy of CelesTrak (Dr. T.S. Kelso).(required)
Cadence
Upstream refresh about every 2 h
Priority
100

Connectors

  • celestrak_groupsevery 2 h

    CelesTrak thematic GP groups → satellite tags / constellation membership

    Last sync
    2 h ago
    Next run
    in 20 min
    Duration
    69.2 s
  • celestrak_gpevery 2 h

    CelesTrak GP element sets (OMM JSON) for the `active` group + orbital history

    Last sync
    2 h ago
    Next run
    in 19 min
    Duration
    749 ms

Raw snapshots

91

Provenance rows

16,564

Last snapshot

2 h ago

CelesTrak SATCAT

Scientificcatalog fresh
Website
celestrak.org/satcat/
License
CelesTrak terms
Attribution
Satellite catalog data courtesy of CelesTrak.(required)
Cadence
Upstream refresh about every 1 d
Priority
90

Connectors

  • celestrak_satcatevery 1 d

    CelesTrak SATCAT (all catalogued objects: type, owner, launch, decay, status)

    Last sync
    2 h ago
    Next run
    in 22 h
    Duration
    5.3 s
    Failures
    1 consecutive

Raw snapshots

1

Provenance rows

99,384

Last snapshot

2 h ago

SatelliteIndex (derived / curated)

Derived / secondaryderived fresh
Website
www.satelliteindex.io/methodology
License
SatelliteIndex methodology
Attribution
Derived by SatelliteIndex (name patterns, orbit classification, curated registry).
Cadence
On demand (derived after each ingestion)
Priority
10

Connectors

  • derived_analyticsevery 1 h

    Refresh materialized views, stats snapshots, search index and derived events

    Last sync
    30 min ago
    Next run
    in 30 min
    Duration
    2.1 min

Raw snapshots

0

Provenance rows

0

Last snapshot

unavailable

Source priority

Which source wins for each field

Sources are ordered by priority; a higher-priority source overrides a lower one for the fields it covers, and every accepted value is recorded in field_provenance with the source and observation time. Objects that disappear from a feed are never deleted.

FieldSourceNote
Orbital elements (mean motion, eccentricity, inclination, RAAN, argument of perigee, mean anomaly, B*)CelesTrak GPOMM element sets from the `active` GP group; every epoch is appended to the orbital history, the latest becomes the orbital state.
Catalog identity (NORAD, COSPAR, object name, object type)CelesTrak SATCATFull catalog snapshot, diffed against the canonical table on every run.
Status (operational status code), decay dateCelesTrak SATCATOPS_STATUS_CODE mapped to the canonical status; a decay date always wins.
Owner code, launch date, launch siteCelesTrak SATCATOwner codes are resolved to countries and organizations with the curated owner-code table.
Launches (international designator prefix YYYY-NNN)Derived from SATCATGrouped from the COSPAR designator of the catalogued objects; counts refreshed after each SATCAT run.
Constellation membership, tagsCelesTrak GP groups, then SatelliteIndex name patternsA group membership is source-backed; a regular-expression match on the name is derived.
Orbit class, mission type, operator/country from owner code, activity score, orbital densitySatelliteIndex (derived / curated)Versioned metric definitions — see the methodology page.

Planned

4 planned connectors

These catalogs are registered with their license and attribution so the schema is ready for them, but they are not ingested yet. They are listed here for honesty about coverage — no field on the site is currently attributed to them.

Space-Track (18 SDS)

Government· officialorbitalPlanned connector
Website
www.space-track.org
License
Space-Track user agreement
Attribution
Space-Track.org (18th Space Defense Squadron).(required)
Cadence
Upstream refresh about every 4 h
Priority
95

Registered in the source catalog with its license and attribution, but no connector is running yet. Nothing on the site is sourced from it today.

Connectors

No connector registered.

Raw snapshots

0

Provenance rows

0

Last snapshot

unavailable

UNOOSA Register of Objects Launched into Outer Space

Intergovernmental· officialregistryPlanned connector
Website
www.unoosa.org/oosa/osoindex/
License
UN terms of use
Attribution
United Nations Office for Outer Space Affairs.(required)
Cadence
Upstream refresh about every 1 d
Priority
85

Registered in the source catalog with its license and attribution, but no connector is running yet. Nothing on the site is sourced from it today.

Connectors

No connector registered.

Raw snapshots

0

Provenance rows

0

Last snapshot

unavailable

ESA DISCOS

Intergovernmental· officialcatalogPlanned connector
Website
discosweb.esoc.esa.int
License
ESA DISCOS terms (API key)
Attribution
ESA DISCOS (Database and Information System Characterising Objects in Space).(required)
Cadence
Upstream refresh about every 1 d
Priority
85

Registered in the source catalog with its license and attribution, but no connector is running yet. Nothing on the site is sourced from it today.

Connectors

No connector registered.

Raw snapshots

0

Provenance rows

0

Last snapshot

unavailable

GCAT (Jonathan McDowell)

ScientificcatalogPlanned connector
Website
planet4589.org/space/gcat/
License
CC BY 4.0
Attribution
GCAT: General Catalog of Artificial Space Objects, Jonathan C. McDowell (CC BY 4.0).(required)
Cadence
Upstream refresh about every 1 d
Priority
80

Registered in the source catalog with its license and attribution, but no connector is running yet. Nothing on the site is sourced from it today.

Connectors

No connector registered.

Raw snapshots

0

Provenance rows

0

Last snapshot

unavailable

Attribution

How we credit sources

SatelliteIndex aggregates public and licensed orbital, governmental, scientific, and operator data from multiple sources. Orbital data courtesy of CelesTrak. Derived classifications (constellation membership, orbit class, mission type) follow the published methodology.

If you reuse data from this site or its API, carry the attribution texts above forward — see the API page.