Vanguard 1.
Category. Statistic.
Launch vehicle. Vanguard rocket.
Launch date. March 17, 1958, 12:15:41 UTC.
Launch site. Cape Canaveral LC-18A.
Ceased operations. May 1964.
Owner(s). U.S. Navy.
Major contractor(s).  Naval Research Laboratory.
Is it still in orbit. Yes, until either 2198 or 3958 depending on who you believe. Vanguard 1 is the oldest satellite still in orbit (as of 2015).
Launch mass. 1.47 kilograms (3.2 lb).
Nationality(s). American.
Satellite type. Earth science (geodetic measurements).
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Vanguard 1 composite

Image of the satellite Vanguard 1. Vanguard 1 satellite (NASA). Composite illustration assembled from static display of satellite, Earth from orbit and telescope photo of stars.

Vanguard 1 1 30 1202:12

Vanguard 1 1 30 12

Vanguard 1 1/30/12.

Vanguard rocket launch "TV-4 satellite on orbit", (blockhouse AUDIO), March 17 1958-005:18

Vanguard rocket launch "TV-4 satellite on orbit", (blockhouse AUDIO), March 17 1958-0

Vanguard rocket launch: "TV-4 satellite on orbit", (blockhouse AUDIO), March 17 1958. TV-4 achieved a stable orbit with an apogee of 3,969 kilometers (2466 mi) and a perigee of 650 kilometers (404 mi).

Vanguard 1 was once described by then-Soviet Premier Nikita Khrushchev as, "The grapefruit satellite." due to it's physical size.

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