This flight was part of the developmental work of the Stratoscope II project. The Stratoscope II system was one of the most sophisticated systems, electronically and mechanically, ever to be carried by a balloon. The project was under the direction of Martin Schwarzschild, astronomer at Princeton University. The instrument was a 36-inch telescope, designed to permit greatly improved nocturnal observation of planetary and stellar objects with a resolution of 0.1 second of arc.
The instrument performed eight scientific flights between March 1963 and September 1971.
Balloon launched on: 9/12/1969
Launch site: Columbia Scientific Balloon Facility, Palestine, Texas, US
Balloon launched by: National Center for Atmospheric Research (NCAR)
Balloon manufacturer/size/composition: Zero Pressure Balloon Winzen 2.030.000 cuft (1.5/1.5 (Cap.) mil. Stratofilm)
Flight identification number: 498P
End of flight (L for landing time, W for last contact, otherwise termination time): 9/13/1969
Balloon flight duration (F: time at float only, otherwise total flight time in d:days / h:hours or m:minutes - ): F 11 h 15 m
Payload weight: 3510 lbs.
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