TLE (12.10.2017)

1 42784U 17036V 17285.01534388 .00002336 00000-0 10859-3 0 9997
2 42784 97.4375 343.4344 0011547 220.1696 139.8687 15.20926223 16787

Status update:
PEGASUS was launched on the 23rd of June, 2017. The most important step, the deployment of the antennas, took place 30 minutes after the orbit insertion. This activity, which his conducted autonomously by PEGASUS, is one of the most critical ones. Fortunately, everything worked as planned and the first beacon was received only 3 hours after the launch by the ground station network of PEGASUS (http://spacedatacenter.at/pegasus/index.php). Since then, the ground station network established by the Space Technology Group, is continuously receiving data from the Satellite.

The information contained in the beacons allow a preliminary assessment of the satellites functionality and health. Following the establishment of a sound communication with the satellite, the downloading of the so-called House Keeping Data (HKD) was initiated. They HKD contain a comprehensive summary of all relevant satellite parameters and subsystem status such as temperatures, voltages, current values, magnetic field measurements, gyration data and many more. In total, the HKD contains 40 parameters with a time resolution of 1 second over the complete mission time.

Nearly all subsystems of the satellite are by now commissioned. Beside of the nominal operation the following activities were conducted as part of the commissioning phase during the last months:

• Successful commissioning of the GPS
• Successful deployment of the MagBoom (for magnetic field measurement)
• Deployment of the Langmuir probes (unfortunately no feed-back available if deployment is successful)
• Activation of the Attitude Determination and Control System and de-tumbling of PEGASUS

Just recently, the PEGASUS team initiated the first steps of the Science Unit (SU) commissioning. Finalization of the SU commissioning is expected in November.

The time line of the operational activities got shifted backwards due to some anomalies the PEGASUS team observes in the operation. Due to a yet unknown reason, the satellite puts itself occasionally in a sleep mode. This occurs in irregular intervals and last in some cases for several days. The team tries to reproduce this behavior with the spare model of the flight until and several possible reasons are investigated. Beside of a loss of communication those black-out do not seem to have any other detrimental effect on the satellite.




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