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Explorer 2
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=== Satellite Drag Atmospheric Density === Because of its symmetrical shape, Explorer 2 was selected for use in determining upper atmospheric densities as a function of altitude, latitude, season, and [[Solar activity and climate|solar activit]]y. Density values near [[Apsis|perigee]] were deduced from sequential observations of the spacecraft position, using optical ([[Schmidt camera|Baker-Nunn camera network]]) and radio and/or radar tracking techniques.<ref name="Instrument3">{{cite web|url=https://nssdc.gsfc.nasa.gov/nmc/experiment/display.action?id=1958-001A-03|title=Experiment: Satellite Drag Atmospheric Density|publisher=NASA|date=14 May 2020 |access-date=14 February 2021}} {{PD-notice}}</ref>
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