Country of Origin: United States of America
Overall: 7 in. tall x 8 in. wide x 3 in. deep (17.8 x 20.3 x 7.6cm)
Magnesium and aluminum casings
Two flight spare units for the ultraviolet photometers flown on OGO-4 for airglow and Lyman alpha studies. These are simple ionization chambers set behind filters of varying substances and thicknesses, typically lithium fluoride. Orbiting Geophysical Observatory 4 was launched in July 1967. The photometers were transferred to NASM by the Naval Research Laboratory in July 1982.
Transferred from the Naval Research Laboratory