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Data Sources

1. DigitalGlobe (https://www.digitalglobe.com)
2. CelesTrak (https://celestrak.org/NORAD/elements/)
3. Optional analytics: AstriaGraph uses Amplitude to receive aggregate interaction events such as filter selections, object counts, data mode, and source labels. Object names and catalog identifiers are not sent.
4. JSC Vimpel (http://spacedata.vimpel.ru)
5. LeoLabs (https://www.leolabs.space)
6. Planet (https://www.planet.com)
7. SeeSat-L ( http://www.satobs.org/seesat/seesatindex.html, https://www.prismnet.com/~mmccants/tles)
8. UK Space Agency ( https://www.gov.uk/government/organisations/uk-space-agency)
9. Union of Concerned Scientists ( https://www.ucsusa.org/nuclear-weapons/space-weapons/satellite-database)
10. USSTRATCOM (https://www.space-track.org)

Orbit Determination

The "Astria OD/LeoLabs Data" source shows the results we get by doing orbit determination on radar data from LeoLabs. The "Astria OD/Starbrook Data" source is the result of fitting angles measurements from the UK space agency's Starbrook telescope.

We use our open-source OD library, which is based on the Orekit astrodynamics framework. The OD source code is available at https://github.com/ut-astria/orbdetpy.

Visualization

Resident space object data obtained from the sources listed above are stored internally as Cartesian vectors in the J2000 reference frame. Objects and orbits are visualized using the equations of motion of the Kepler two-body problem. In order to reduce computational cost to the browser, perturbations from Earth oblateness, third bodies, atmospheric drag, solar radiation pressure etc., are not taken into account. The source code is available at https://github.com/ut-astria/AstriaGraph.