Purpose of the flight and payload description

The main objective of the instrument is to make observations of the Cosmic Microwaves Background anisotropies.

The heart of the ARGO 1989 experiment is a Cassegrian Telescope, the primary mirror has a diameter of 120 cm and was built in alluminium alloy for a total weight of 35 Kg.

The secondary mirror is also in aluminum alloy and can be wobbled with an amplitude of 4º with respect to the optical axis.

Radiation collected from the telescope is then, splited in 3 cryogenic bolometric detectors.

The telescope is completed by a large thermal radiation shield made using an aluminium skeleton supporting a 10 cm thick glass wool insulation covered with several foils of aluminized mylar. The overall instrument is mounted on a stabilized gondola.

Besides that scientific objetive, this flight was used also to test many subsystems wich will compose the future TIR telescope, for this reason this experiment was also called Mini-TIR.

In this flight all the systems performed perfectly and valuable scientific data was obtained from the observation of the infrared diffuse emission from the Galactic dust at high Galactic latitudes.

Details of the balloon flight

Balloon launched on: 8/9/1989 at 22:45 local
Launch site: Base di Lancio Luigi Broglio, Trapani, Sicily, Italy  
Balloon launched by: Agenzia Spaziale Italiana (ASI) / Centre National d'Etudes Spatiales (CNES)
Balloon manufacturer/size/composition: Zero Pressure Balloon 600.000 m3
End of flight (L for landing time, W for last contact, otherwise termination time): 8/10/1989
Balloon flight duration (F: time at float only, otherwise total flight time in d:days / h:hours or m:minutes - ): 22 h 51 m
Landing site: In El Bosque, near Jerez de la Frontera, Spain
Campaign: ODISSEA 89  
Payload weight: 2487 kgs

The balloon was launched at 22.45 local time on August 9, 1989 by dynamic method using a crane as launch vehicle.

The balloon headed due west fliying over the Mediterranean towards Spain. The flight duration was of 22 hours and 51 minutes.

The payload was cutdown over Spain at 36,53º N - 5,53º O, and landed by parachute, in El Bosque, near the city of Jerez de la Frontera.

The balloon landed west of Montellano (Sevilla), in the cortijo �El Bollo�.

External references

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