Vela

Vela was the US satellite program built to verify that nobody was testing nuclear weapons in the atmosphere or in space. It grew out of a 1959 "Buzzer Committee" formed by Los Alamos and Sandia to study satellite-based detection, funded by ARPA, with LASL's P-4 group building the first instruments [S2]. The first pair launched on 16 October 1963 to support the Limited Test Ban Treaty, and later the 1974 Threshold Test Ban Treaty [S1].

Six twin-satellite launches flew between 1963 and 1970, twelve satellites in all. Sandia supplied EMP detectors, optical "bhangmeter" detectors and data-processing electronics; Los Alamos instruments produced ancillary science including Ray Klebesadel's discovery of cosmic gamma-ray bursts [S1][S2]. The Advanced Vela satellites of 1969–1970 were Earth-oriented and able to detect atmospheric, near-surface and shielded detonations. The last Vela was deactivated on 27 September 1984; the program recorded no in-flight failures [S1].

Vela's significance here is twofold: NNSA describes it as the direct start of today's US Nuclear Detonation Detection System, and Vela 6911 recorded the still-disputed double flash of 22 September 1979. See the DOE weapons-lab lane research report.

Sources

[S1] "Happy 60th birthday to Vela, watchman for nuclear detonations" | Sandia Lab News URL: https://www.sandia.gov/labnews/2023/10/19/happy-60th-birthday-to-vela-watchman-for-nuclear-detonations/ Accessed: 2026-08-27 Claim: Launch dates, satellite count, instrument contributions, Advanced Vela, 1984 deactivation.

[S2] "LANL National Security Science, Summer 2020 — Cold War Watchman" URL: https://cdn.lanl.gov/summer-2020-pdf_ab7f4.pdf Accessed: 2026-08-27 Claim: 1959 Buzzer Committee, ARPA funding, P-4 group instruments, gamma-ray burst discovery.