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Advanced Research and Observation satellite, also called P91-1


Designation 25634 / 99008A
Launch date 23 Feb 1999
Country of origin United States
Mission Scientific
Perigee/Apogee 831/848 km
Inclination 98.7°
Period 102 min
Launch vehicle Delta 2 #267

Will collect valuable data on the Earth's global environment performing technology demonstrations for military space programs.

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Technical data


Prime contractor Boeing
Mass at launch 2700 kg
Mass in orbit  
Solar array  
DC power  
Design lifetime 3 years

9 experiments on-board. The most important one is HTSCE II (High Temperature Super Conducting Experiment II) which will test supraconductors. Another interesting experiment is the Electric propulsion Space Experiment (ESEX); it was tested during 141 seconds with a 27 kW electric arc (150 minutes of tests are planned). The experiment must demonstrate no interference with the other satellite payloads.

Carries a $2 million space dust instrument of the University of Chicago (Spadus).

Transmissions: 2212.5 & 2262.5 MHz
Carriers on 400.033 and 150.013 MHz

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