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Summary

The STereo imaging Channel (STC) camera on ESA's BepiColombo mission provides 3D Mercury surface mapping. Its geometrical calibration and distortion modeling using the Rational Function Model (RFM) are detailed.

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Area of Science:

  • Planetary Science
  • Space Instrumentation
  • Optical Engineering

Background:

  • The STereo imaging Channel (STC) is the first push-frame stereo camera on a European Space Agency (ESA) satellite, part of the BepiColombo mission to Mercury.
  • Launched in 2018, STC aims to create a global 3D reconstruction of Mercury's surface upon arrival in 2025.

Purpose of the Study:

  • To describe the geometrical calibration of the STC instrument.
  • To present the methods for deriving focal lengths, boresights, and reference systems for STC's filter models.
  • To discuss the distortion results and the development of a distortion map model.

Main Methods:

  • Geometrical calibration of the STC instrument, including optical setups.
  • Derivation of focal lengths, boresights, and reference systems for six filters (two panchromatic, four broadband).
  • Development and application of the Rational Function Model (RFM) for distortion mapping due to the off-axis configuration.

Main Results:

  • Successful geometrical calibration of the STC instrument.
  • Determination of key optical parameters and reference systems for all filters.
  • Demonstration of the RFM's capability to model complex distortions in off-axis stereo cameras.

Conclusions:

  • The geometrical calibration and distortion modeling of the STC are crucial for accurate 3D surface reconstruction of Mercury.
  • The Rational Function Model (RFM) proves effective for characterizing the distortions of the STC's unique optical design.
  • This work validates the STC's readiness for its mission objectives in mapping Mercury's surface.