12 December 1961: OSCAR-1 Launches Aboard Thor-Agena B as the World’s First Non-Governmental (Amateur) Satellite & First Amateur Piggyback Payload (4.5 kg, 144.983 MHz)
Built by Project OSCAR radio amateurs, the 4.5 kg OSCAR-1 launched on 12 Dec 1961 as the first non-governmental (amateur) satellite and the first amateur piggyback payload, keying 'HI' on 144.983 MHz.
Just four years after Sputnik-1 (and eighteen months after the US Navy’s GRAB-1 / Solrad-1 demonstrated the first governmental dual-payload piggyback launch in June 1960), a group of Silicon Valley engineers and radio amateurs led by Lance Ginner (K6GSJ), Chuck Towns (K6LFH), Don Stoner (W6TNS), Harley Gabrielson (W6HEK), and Bill Orr (W6SAI) formed Project OSCAR (Orbiting Satellite Carrying Amateur Radio) and persuaded the US Air Force to replace a 10-pound block of cast-iron ballast on the Discoverer 36 (Thor-Agena B) launch with a convex rectangular magnesium-alloy picosatellite.
Launched from Vandenberg on 12 December 1961 at 20:42 UTC and ejected from the Agena aft equipment rack via a compressed-spring mechanism, the 4.5 kg (30×25×12 cm) OSCAR-1 became the world’s first non-governmental (amateur) satellite and the first amateur piggyback payload.
Powered by mercury batteries for 22 days before re-entering on 31 January 1962, its transistorized 100 mW 2-meter VHF beacon (144.983 MHz) transmitted the Morse letters 'HI' at a speed controlled by an internal thermistor—allowing 570 radio amateurs across 28 countries to decode real-time orbital temperature telemetry.
CELESTRAK SATCAT & TELEMETRY RECORD
Verified Spacecraft Key Facts & Orbital Dossier
| Spacecraft | Class | Operator / Country | Launch & Vehicle | NORAD / COSPAR | Orbit & RF Downlink | Catalog Status |
|---|---|---|---|---|---|---|
FUNcube-1 (AO-73) | 1U | AMSAT-UK / AMSAT-NL GB | Dnepr · ISIPOD | NORAD 39444 2013-066AE | 145.935 MHz (VHF/UHF) | Active |
HADES | 1.5P | AMSAT-EA ES | Falcon 9 (Transporter-3) · AlbaPod | NORAD 51080 2022-002DA | Decayed | |
HADES-ICM | 1.5P | AMSAT-EA / Hydra Space / IC Mercury ES | Falcon 9 (Transporter-13) · AlbaPod | NORAD 63492 2025-052BN | VHF / UHF | Decayed |
Catalogued Mission Summaries & Flight Notes
- FUNcube-1 (AO-73) (1U, 2013):
- Landmark 1U educational and amateur radio CubeSat launched on the November 2013 Dnepr cluster; carries a 1200 bps BPSK telemetry beacon on 145.935 MHz and an inverting U/V linear transponder still active after >12 years. In orbit; 145.935 MHz BPSK telemetry beacon and U/V transponder active per AMSAT-UK Data Warehouse and SatNOGS DB.
- HADES-ICM (1.5P, 2025):
- 1.5P AMSAT-EA amateur voice transponder and graphene thermal experiment deployed on Transporter-13.