Editing Vanguard 1 (section)

== Spacecraft design ==
The spacecraft is a {{cvt|1.46|kg}} [[Aluminium|aluminum]] [[sphere]] {{convert|6|in|mm|spell=in}} in diameter, with antennas spanning {{convert|3|ft|m|spell=in}}. It contains a 10 [[Watt|mW]], 108 [[Hertz|MHz]] transmitter powered by a [[mercury battery]] and a 5&nbsp;mW, 108.03&nbsp;MHz transmitter that was powered by six [[solar cell]]s mounted on the body of the satellite.<ref>{{cite web|url=http://oai.dtic.mil/oai/oai?verb=getRecord&metadataPrefix=html&identifier=AD0419878|title=Project Vanguard Report No. 23 Minitrack Report No. 3, Receiver System|publisher=dtic.mil|url-status=dead|archive-url=https://web.archive.org/web/20110823131330/http://oai.dtic.mil/oai/oai?verb=getRecord&metadataPrefix=html&identifier=AD0419878|archive-date=2011-08-23}} {{PD-notice}}</ref> Six {{cvt|30|cm}} long [[Antenna (radio)|antennas]], {{cvt|0.8|cm}} diameter spring-actuated aluminum alloy aerials protrude 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 the ground stations.<ref name="Display"/>

A backup version of Vanguard 1 is on display at the [[National Air and Space Museum|Smithsonian National Air and Space Museum]], [[Steven F. Udvar-Hazy Center]] in [[Chantilly, Virginia]].<ref name=udvarbackup>
{{cite web|url=https://airandspace.si.edu/collection-objects/satellite-vanguard-1-backup|title=Satellite Vanguard 1 Backup|website=airandspace.si.edu|publisher=Steven F. Udvar-Hazy Center|access-date=19 March 2018|url-status=live|archive-url=https://web.archive.org/web/20180205130200/https://airandspace.si.edu/collection-objects/satellite-vanguard-1-backup|archive-date=5 February 2018}} {{PD-notice}}</ref>