FR 1

About This Satellite

FR-1 was France's first scientific satellite, launched by an American Scout rocket on December 6, 1965. Its mission investigated the ionosphere through radio measurements. CNES's contemporary film archive documents the French manufacturing and testing campaign, transport to the launch site, antenna checks, and launch preparation, showing the ground work behind this early scientific mission.

Scientific mission and national launch capability were different milestones

CNES identifies FR-1 as a French scientific satellite while explicitly recording an American launch vehicle. Those statements are compatible: the country developing a spacecraft need not supply its rocket. Calling it the first French scientific satellite is not the same as calling it the first French satellite of any kind, or the first launch from French territory.

The historical film is a record of the programme, not orbital imagery

The archive describes fabrication, assembly, tests, transport, and launch operations. These scenes help explain how FR-1 was built and prepared, but they are not pictures of the ionosphere taken by its payload. Its science must be understood through the radio and plasma measurements, with their own instrument descriptions and acquisition dates.

Mission reference: CNES historical film catalog: Operation FR1. Editorial review: 2026-09-14.

Ground transmitters provided signals for an orbital experiment

NASA's experiment catalog lists very-low-frequency receivers measuring electric and magnetic fields from ground-transmitted signals, together with an electron-density probe. Two dipoles served the electric-field measurements and three loop antennas served the magnetic-field measurements. These were measurements of wave fields at the spacecraft, not conventional photographs or a broadcast service for household receivers. Comparing different field components helped characterize how radio waves propagated through plasma.

Reference: NASA NSSDC: FR-1 VLF and electron-density experiments.

No recorder meant gaps between scheduled ground contacts

The same catalog states that FR-1 had no onboard tape recorder, so observations were obtained in real time over designated telemetry stations. An orbit around Earth did not produce an uninterrupted worldwide data record. The catalog dates the last usable VLF data to August 26, 1968; that experiment milestone does not mean the physical spacecraft reentered on that date.

Reference: NASA NSSDC: FR-1 real-time telemetry and last usable VLF data.

Reading this orbital snapshot

Based on TLE epoch: 2026-09-05. Estimated altitude ranges from 651 km at perigee to 660 km at apogee, a difference of 9 km. The orbital period is about 97.8 minutes. Eccentricity 0.00063 indicates a nearly circular path. In a two-body approximation, perigee speed is 1.00 times apogee speed. These are mean-element estimates, not instantaneous measurements. Distance per orbit uses an ellipse approximation.

Saved build snapshot. If a valid TLE is retrieved, this explanation and the orbit panel update together. Otherwise this dated snapshot is retained.

Ground track is not sensor coverage

An inclination of 75.86 degrees implies approximate geocentric ground-track limits of 75.9 degrees north and south. This is a prograde orbit, moving in the same general direction as Earth rotation. The plotted line marks the point beneath the object. It does not represent camera coverage, radio reception, or a guaranteed visible pass.

Accuracy and missing information

The introductory record describes the build snapshot. The orbital snapshot explanation and orbit panel share any successfully retrieved TLE; check the displayed epoch. Reentered objects retain historical data only. Mission history is not rewritten by TLE updates. TLE/SGP4 positions are predictions and can change after maneuvers or updated observations. The 14-day stale-data cutoff is a display safeguard, not an accuracy guarantee. Local passes are geometric predictions, not a visibility forecast. No verified operator or mission status means unknown, not active. Do not use this catalog for collision avoidance or operational flight decisions.

Catalog sources: CelesTrak SATCAT: NORAD 1814 · GCAT: S01814 (source update 2026 Sep 4 2345:57). Supplementary metadata: SatNOGS DB, retrieved 2026-09-05T12:57:25.375Z. Page assembled 2026-09-15. GCAT phase codes describe trajectory phases, not mission health.

Learn more: TLE data · Perigee and apogee · Ground tracks · JOT (Jewawud Live Orbital Map)

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