Launch Summary
The first two flights of the Vanguard program, designated Test Vehicle (TV)-0 and -1, were actually the last two remaining RTV-N-12a Viking rockets. TV-0, launched on December 8, 1956, primarily tested new telemetry systems, while TV-1 on May 1, 1957 was a two-stage vehicle testing separation and ignition of the solid-fueled upper stage of Vanguard. TV-2, launched on October 23, 1957 after several abortive attempts, was the first real Vanguard rocket. The second and third stages were inert, but the flight successfully tested first/second-stage separation and spin-up of the third stage. However, by that time, the Soviet Union had already placed the "Sputnik" satellite into orbit, and therefore project Vanguard was more or less forced to launch its own satellite as soon as possible. Therefore, a very small experimental satellite (called the "grapefruit" and weighing only 1.8 kg (4 lb)) was added to TV-3, which was to be the first test of an all-up Vanguard rocket. Although the NRL and Martin tried to emphasize that the TV-3 mission was a pure test flight (and one with several "firsts"), everyone else saw it as the first satellite launch of the Western world. Wernher von Braun angrily said about the Sputnik launch: "We knew they were going to do it. Vanguard will never make it. We have the hardware on the shelf. We can put up a satellite in 60 days".
On 6 December the US Navy launched a Vanguard rocket, carrying a 1.3 kg (2.9 lbs) satellite, from Cape Canaveral. It only reached an altitude of 1.2 meters (4 ft), fell and exploded. The satellite was thrown clear, still transmitting as it rolled away. The American press called it Kaputnik.
Flight TV-3BU (BU = Backup) on February 5, 1958 broke up after 57 seconds because of a control system malfunction, but TV-4 on March 17, 1958 finally succeeded in placing a "Grapefruit"-type satellite into orbit. By that time, however, the Army's Juno (Jupiter-C) had already launched the United States' first satellite. The TV-4 satellite, labeled Vanguard 1, reached a relatively high orbit (3966 km (2465 miles) x 653 km (406 mi)) and is currently the oldest human artifact in space. The following four flights, TV-5 and SLV (Satellite Launch Vehicle)-1 through -3 all failed, but on February 17, 1959, SLV-4 launched Vanguard 2 (weighing 10.8 kg (23.7 lb)) into orbit. The SLVs were the "production" Vanguard rockets. SLV-5 and -6 also failed, but the final flight on September 18, 1959 successfully orbited the 23.6 kg (52 lb) Vanguard 3 satellite. That last mission was designated TV-4BU, because it used a remaining test vehicle, which had been upgraded with a new third stage, the Allegheny Ballistics Lab X-248A2 Altair. This more powerful motor enabled the launch of the heavier payload. The combination of the AJ10 liquid engine and X-248 solid motor was also used, under the name Able, as an upper stage combination for Thor and Atlas space launch vehicles.
Read more about this topic: Vanguard (rocket)
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