|Mission type||Atmospheric studies|
|Operator||SERC / NASA|
|Mission duration||43 months|
|Launch mass||89.8 kilograms (198 lb)|
|Start of mission|
|Launch date||5 May 1967, 16:00:01UTC|
|Launch site||Vandenberg SLC-5|
|End of mission|
|Decay date||14 December 1970|
|Perigee altitude||496 kilometres (308 mi)|
|Apogee altitude||599 kilometres (372 mi)|
|Epoch||7 June 1967|
Ariel 3 (UK 3 or United Kingdom Research Satellite 3) was the first artificial satellite designed and constructed in the United Kingdom. it was launched from Vandenberg Air Force Base on 5 May 1967 aboard a Scout rocket. Ariel 3 had an orbital period of approximately 95 minutes, with an apogee of 608 km and a perigee of 497 km. It initially spun at 31 rpm for stability, though by the time the Ariel 3 deorbited, it had slowed to a rate of about 1 rpm.
Ariel 3 carried five experiments. The experiments measured properties of the thermosphere as well as detected "terrestrial radio noise" from thunderstorms and measured large-scale galactic radio frequency noise. Experimental data was recorded on an onboard tape recorder, then later transmitted to waiting observers on Earth. Ariel 3 was also fitted with a series of mirrors to allow easy observation of the satellite. On 24 October 1967 the tape recorder aboard Ariel 3 began to malfunction. This restricted observation to real-time operation only. Ariel 3 suffered from a significant power failure in December 1968, restricting the satellite's operation to daylight hours only. The satellite was completely shut down in September 1969. Its orbit decayed steadily until on 14 December 1970 when Ariel 3 re-entered Earth's atmosphere.
- McDowell, Jonathan. "Satellite Catalog". Jonathan's Space Page. Retrieved 6 December 2013.
- "'On This Day' for May 5, 1967 - First all-British satellite 'Ariel 3' launched". BBC News. 5 May 1967. Retrieved 1 January 2010.
- "Ariel 3". US National Space Science Data Center. Retrieved 3 March 2008.
- Photograph that depicts Ariel 3 correctly
- National Space Science Data Center entry for Ariel 3
- On This Day for May 5, 1967 BBC News
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