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Ephemeris Repository

The Ephemeris Repository provides a centralized location to view, upload, and manage all ephemerides used within Satcat Operations. It includes both operator-uploaded files and shared catalog data used for screening and coordination.

Operational Ephemeris​

An ephemeris defines an asset's predicted trajectory, typically based on a recent orbit determination. Satcat uses ephemeris files to compute conjunction risk, generate CDM reports, and support mitigation planning.

Each file is tagged with metadata to support Satcat's Space Traffic Coordination (STC) system:

  • Designation — Defines the file's authority and purpose (OPERATIONAL, THEORETICAL, etc.)
  • Context — Describes intent behind the trajectory (ROUTINE, COLA, etc.)

Only OPERATIONAL ephemerides and derived data can be used by other operators. Learn about Operational Ephemeris

Uploading Files​

Ephemeris can be uploaded manually from the repository, within a conjunction event, or via Satcat's SDK/API. All uploaded files are listed with:

  • Upload date
  • Associated NORAD ID
  • Useable start and end times
  • STC Metadata tags

Manual Upload​

  1. Select a file and specify its format
    Auto-detect is recommended - View supported file formats
  2. Assign asset using NORAD ID.
    You cannot upload files for assets not in your organization.
  3. Set Designation and Context
From Mitigation Planning

When uploading from a conjunction event, NORAD ID is auto-filled and the file is designated THEORETICAL. Operational designation applies only after plan validation.

Automation​

Operators are strongly encouraged to automate ephemeris uploads to ensure timely conjunction screening and risk assessment.

Automation ensures your latest operational data is used in screenings and shared with other coordinated operators.

Operational Catalog​

The Operational Catalog aggregates all ephemerides explicitly marked as Public by Satcat operators. These trajectories are available for use in screening jobs and coordination workflows across the platform.

  • Inclusion is based on ephemerides uploaded with OPERATIONAL designation and public visibility.
  • Ephemerides in the Operational Catalog are treated as authoritative for conjunction analysis.
  • The catalog updates continuously as operators upload and re-designate files.

Screening jobs can select the Operational Catalog as source of secondary ephemeris data. Usage metadata is displayed in screening results to identify the source of each trajectory used.

Data Access

Only your organization can download or access your uploaded ephemerides unless explicitly designated as Public in Privacy settings.
Learn more about Data Privacy Settings

SP Catalog Access​

Satcat Operations includes access to the 18 SDS Special Perturbations (SP) catalog under existing SSA agreements. These ephemerides are updated daily and available for download if required.