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Vanguard 2 (or Vanguard 2E before launch) is an Earth-orbiting satellite launched 17 February 1959 at 15:55:02 GMT, aboard a Vanguard SLV-4 rocket as part of the United States Navy's Project Vanguard. [4]
Vanguard SLV-2 hoped to put into orbit the Vanguard 2C satellite, a Lyman Alpha satellite, with a magnetosphere measurement device. The satellite payload was 9.75 kg (21.5 lb). Vanguard SLV-2 only reached an altitude of 165 km (103 mi), the goal was 3,840 km (2,390 mi) to orbit. [2] [3] The SLV-2 satellite was a 9.75 kg, 50.8 cm diameter sphere.
Vanguard TV-2 arrived at Cape Canaveral in June 1957. Vanguard TV-2 was a prototype as it had a liquid rocket first stage, a dummy (no fuel) second stage, and a dummy (no fuel) third stage. Three Vanguard stages were needed to put a satellite in orbit, the final goal of the Vanguard project. Since stage two and three had no power the test ...
The Vanguard rocket [1] was intended to be the first launch vehicle the United States would use to place a satellite into orbit. Instead, the Sputnik crisis caused by the surprise launch of Sputnik 1 led the U.S., after the failure of Vanguard TV-3, to quickly orbit the Explorer 1 satellite using a Juno I rocket, making Vanguard 1 the second successful U.S. orbital launch.
Just 15.2 cm (6.0 in) in diameter and weighing 1.4 kg (3.1 lb), Vanguard 1 was described by then-Soviet Premier Nikita Khrushchev as, "The grapefruit satellite". [3] Vanguard 1, and the upper stage of its launch vehicle, are the oldest artificial satellites still in space, as Vanguard's predecessors, Sputnik 1, Sputnik 2, and Explorer 1, have ...
Vanguard 2. Measured cloud cover. First attempted photo of Earth from a satellite; precession motion resulted in difficulty interpreting data (see first images of Earth from space ).
First weather satellite. USA (NRL) Vanguard 2: 7 August 1959: First photograph of Earth from Earth orbit. USA Explorer 6: 13 September 1959: First spacecraft to impact another celestial body (the Moon). First delivery of national pennants to a celestial body. USSR Luna 2: 4 October 1959: First photos of another world from space: the far side of ...
Advanced Land Observing Satellite; Advanced Photovoltaic & Electronic Experiment; Akebono (satellite) ... Vanguard 2; Vanguard 2 upper stage; Vanguard 3; Vanguard 3 ...