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ESTREMO/WXT Initiative: AAS-I Contribution

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ESTREMO/WXT Initiative: AAS-I Contribution. ESTREMO/WXT: Preliminary Consideration. For preliminary ESTREMO feasibility evaluation the basic consideration are about: Launch capability (mass, firing volume, firing height) of Vega for LEO Payload Accommodation Fast pointing

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Presentation Transcript
slide1

ESTREMO/WXT Initiative:

AAS-I Contribution

estremo wxt preliminary consideration
ESTREMO/WXT: Preliminary Consideration
  • For preliminary ESTREMO feasibility evaluation the basic consideration are about:
      • Launch capability (mass, firing volume, firing height) of Vega for LEO
      • Payload Accommodation
      • Fast pointing
  • The more challenging engineeringaspect to be considered is the autonomous fast pointing (req. 60° in 3’ with a goal of 60° in 1’). The fast pointing desiderated dynamics
    • implies Moment of Inertia Minimization (as compact as possible configuration)
    • can imply utilization of special equipment (e.g. Control Moment Gyroscope)
  • For fast pointing the use of off-the-shelf standard equipments (Reaction Wheels) is recommended, mainly for cost, reliability and availability.
  • A very preliminary AAS-I trade-off considers a maximum of 5000 kgm2 as the threshold for the utilization of standard Reaction Wheels (RW).
  • In order to have confidence about the utilization of standard RWs preliminary MoI of a conceptual configuration of ESTREMO has been evaluated.
estremo wxt vega references
ESTREMO/WXT: VEGA References

Vega is an European four-stage launcher, tailored to carry the growing number

of small scientific spacecraft and other lighter-weight payloads under development

or planned worldwide.

Vega's lift capability target to arrive at the ESTREMO orbit (700 km equatorial - circular) is 2200 kg.

estremo wxt preliminary configuration 1 of 2
ESTREMO/WXT: Preliminary Configuration 1 of 2

Launch Configuration

Operative Configuration

estremo wfc preliminary configuration 2 of 2
ESTREMO/WFC: Preliminary Configuration 2 of 2

Optics

TES + Detector + CCD on the bottom (hide by the structure)

Telescope Structure

WFI Mask

WFI Detector

Reaction Wheels

estremo mass moi
ESTREMO: Mass & MoI

System Mass Budget

System MoI Evaluation

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Final Summary

With the available information a preliminary ESTREMO configuration

appears compatible with:

  • Vega Launch capability
  • Payload Accommodation needs
  • Fast pointing with standard equipments
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