1. Main information on the «WORLD SPACE OBSERVATORY» project
ALEXANDER MOISHEEV
Lavochkin Association
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2. Content of Presentation
Main parameters of the Mission
WSO/UV Spacecraft
Status of activities on the project
Schedule of the project development
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3. Main parameters of the mission
Expected launch date – 2010
Life time – 5 years
Operational orbit: conditionally-periodic orbit around the L2 Libration Point at a distance of 106 km from the Earth;
Telescope mass – 1600 kg
Spacecraft mass kg
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4. WSO/UV Spacecraft
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5. WSO/UV Spacecraft Mass of S/C with propellant: 2900 kg, including:
Base service module (BSM) mass: – 1000 kg;
Mass of the truss adapter (between the Telescope and BSM) kg;
Mass of the BSM propellant – 260 kg;
Mass of the payload (T-170M Telescope) kg;
The BSM propellant – hydrazine, pressurization gas – helium.
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6. The WSO/UV spacecraft
Accuracy of the T170M Telescope pointing, no worse than arc. min.
Pointing and stabilization accuracy with use the data of
Fine Guiding Sensor (RMS) – arc.sec.
The spacecraft rate at the precision stabilization mode arc.deg./sec.
Rate of the S/C programmed turns up to arc.deg/sec
Maximal duration of Science observation session
in continuous mode: up to hours
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7. WSO/UV Spacecraft
Bit rate of the scientific data transmission: – up to Mbps;
Bit rate of the housekeeping TM data transmission – up to Kbps.;
Electric power available for the Payload – W;
Voltage of electric power supply – (27±1,35)V;
Solar Array area – m2
“NAVIGATOR” BSM is used as the Space Platform
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8. Т-170М Telescope
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9. Main features of the T-170M Telescope
Mass of the Telescope – 1600 kg;
Primary mirror diameter – 1,7 m
Spectral band – (100 – 700) nm
F-ratio – 10;
Angular diameter of field of view – 30 arc.min;
The Telescope power consumption – 750 W;
Average power consumption of the Scientific Instrumentation – 300 W.
Size (lengthwidth):
Transportation condition – 5,67m  2,30m
Operation condition – 8,43m  2,3m
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10. Status of activities on the project
· The «NAVIGATOR» Service Module is under Ground Developmental Testing, the Flight Model will be integrated in 2006, the first launch: 2007 («Spectrum-R» and «Electro» missions).
The Т170М Telescope is developed on the basis of T-170 Telescope, which had passed the main part of the Ground Developmental Testing Program.
Release of the Working Documentation on Telescope and its systems is coming to end/
At the end of 2006 the manufacturing of the Telescope Qualification Model units will be completed and the dummies of the Primary and Secondary Mirrors will be manufactured..
In 2007 the following activities are planned: Telescope units off-line test, Telescope Qualification Model assembly and its vibration/static tests.
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11. The project development schedule
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12. Problems on the WSO/UV project
Works on the Instrumental Compartment and External Instruments are behind of the general schedule because the Approved Scientific Instrumentation Complete Set is absent.
The Schedule of work on the Scientific Instrumentation is not agreed with the Directive Schedule on the WSO/UV project.
To provide the operational orbit in the L2 neighborhood the activities on the Space Platform are necessary. The activities include replacement of the Radio Complex by the one, that provides scientific data transmission at bit rate up to 1 Mbps uplink and downlink for a distance of 1,8x106 km.
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13. Thank You for your attention
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