Purpose of the flight and payload description

It is a large-area high-sensitivity hard X-ray telescope, operating in the energy range 15-300 keV and is formed of two different arrays: scintillation detectors (NaI, 5.5-mm thick and actively shielded) with a total area of 2700 cm2 and high-pressure xenon gas multiwire proportional counters with a total sensitive area of 900 cm2.

This detector is mounted on a gondola wich includes an elevation drive system and azimuthal control.

The instrument takes their name from the institutions that made it (MIlano FRAscati SOuthampton) and also is referred in certain balloon literature as the PALLAS gondola. Hence the double title.

No scientific data obtained due to the balloon failure.

Footage of the instrument preparation and launch operations

Details of the balloon flight

Balloon launched on: 7/24/1985
Launch site: Base di Lancio Luigi Broglio, Trapani, Sicily, Italy  
Balloon launched by: Centre National d'Etudes Spatiales (CNES)
Balloon manufacturer/size/composition: Zero Pressure Balloon Winzen - 800.000 m3
End of flight (L for landing time, W for last contact, otherwise termination time): 7/24/1985
Landing site: Near the launch site, Sicily, Italy
Campaign: ODISSEA 85  
Overall weight: 2260 kgs

After a succesfull launch by dynamic method using a the launch crane, the balloon burst on ascent at 16000 mts.

The payload was recovered near the launch site.

It was tried to make a transmediterranean flight towards Spain.

External references

Images of the mission


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