S-66A (also called BE-A, acronym of "Beacon Explorer",) was an artificial NASA satellite launched on March 19, 1964 by means of a Delta B rocket, but it could not reach orbit due to a vehicle launcher failure.
Specifications
Launch mass: 114 kilograms (251 lb)
Dimensions: 24.5 by 45.7 centimetres (9.6 in × 18.0 in)
Payloads are separated by bullets ( · ), launches by pipes ( | ). Crewed flights are indicated in bold text. Uncatalogued launch failures are listed in italics. Payloads deployed from other spacecraft are denoted in brackets.