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Vanguard 1
Vanguard 1
Vanguard 1
Credit: NASM
American technology satellite. An engineering test satellite. Based on orbital position data derived from its transmissions, the shape of the earth was refined.

Status: Operational 1957. First Launch: 1957-12-06. Last Launch: 1958-04-29. Number: 4 . Gross mass: 1.00 kg (2.20 lb).

NASA NSSDC Master Catalog Description

Vanguard TV3 was the first U.S. attempt to launch a satellite into orbit around the Earth. It was a small satellite designed to test the launch capabilities of a three-stage launch vehicle and study the effects of the environment on a satellite and its systems in Earth orbit. It also was to be used to obtain geodetic measurements through orbit analysis.

At launch the booster ignited and began to rise but about 2 seconds after liftoff, after rising about four feet, the rocket lost thrust and began to settle back down to the launch pad. As it settled against the launch pad the fuel tanks ruptured and exploded, destroying the rocket and severely damaging the launch pad. The Vanguard satellite was thrown clear and landed on the ground a short distance away with its transmitters still sending out a beacon signal. The satellite was damaged, however, and could not be reused. It is now on display at the Smithsonian Air and Space Museum.

The exact cause of the accident was never determined, presumably it was due to a fuel leak between the fuel tank and the rocket engine, possibly due to a loose connection in a fuel line or low fuel tank pressure allowing some of the burning fuel in the thrust chamber to leak back into the fuel tank.

Spacecraft and Subsystems

The spacecraft was a 1.36-kg aluminum sphere 15.2 cm in diameter, nearly identical to the later Vanguard 1. It contained a 10-mW, 108-MHz mercury-battery powered transmitter and a 5-mW, 108.03-MHz transmitter powered by six solar cells mounted on the body of the satellite. Six short aerials protruded from the sphere. The transmitters were used primarily for engineering and tracking data, but were also used to determine the total electron content between the satellite and ground stations. Vanguard also carried two thermistors to measure the interior temperatures in order to track the effectiveness of the thermal protection.



Subtopics

Vanguard (6.5in) Null

Family: Technology, Technology satellite. Country: USA. Launch Vehicles: Vanguard. Launch Sites: Cape Canaveral, Cape Canaveral LC18A. Agency: USN. Bibliography: 126, 17, 18, 2, 4189, 4190, 4191, 4193, 4194, 6, 86, 7011, 13323, 13324.
Photo Gallery

VanguardVanguard
Credit: Manufacturer Image


Vanguard 1Vanguard 1
Credit: Manufacturer Image



1955 August 1 - . Launch Vehicle: Vanguard.
1955 October 7 - . Launch Vehicle: Vanguard.
1957 May 1 - . Launch Vehicle: Vanguard.
1957 October 1 - . Launch Vehicle: Vanguard.
1957 October 9 - . Launch Vehicle: Vanguard.
1957 December 6 - . 16:44 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC18A. Launch Pad: LC18A. Launch Vehicle: Vanguard. FAILURE: Vehicle lost thrust and exploded after 2 seconds.. Failed Stage: 1.
1958 February 5 - . 07:33 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC18A. Launch Pad: LC18A. Launch Vehicle: Vanguard. FAILURE: Control system malfunction - control lost after 57 sec.. Failed Stage: G.
1958 March 17 - . 12:15 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC18A. Launch Pad: LC18A. Launch Vehicle: Vanguard.
1958 April 29 - . 02:53 GMT - . Launch Site: Cape Canaveral. Launch Complex: Cape Canaveral LC18A. Launch Pad: LC18A. Launch Vehicle: Vanguard. FAILURE: Third Stage failed to ignite.. Failed Stage: 3.
1960 March 17 - . Launch Vehicle: Vanguard.
1961 March 17 - . Launch Vehicle: Vanguard.

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