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Fizeau interferometer for global astrometry in space.

Davide Loreggia1, Daniele Gardiol, Mario Gai

  • 1Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Torino, Via Osservatorio 20, 10025 Pino Torinese, Turin, Italy. loreggia@to.astro.it

Applied Optics
|February 13, 2004
PubMed
Summary

This study details a Fizeau interferometer designed for space astrometry, achieving 10 micro-arcsecond accuracy for faint stars. The optimized design minimizes optical aberrations for enhanced performance.

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Area of Science:

  • * Astronomy and Astrophysics
  • * Optical Engineering
  • * Space Mission Design

Background:

  • * Global astrometry missions require high-precision instruments.
  • * Fizeau interferometers offer potential for precise measurements.
  • * Optical aberrations limit the performance of interferometric systems.

Purpose of the Study:

  • * To design and evaluate a Fizeau interferometer for space-based astrometry.
  • * To optimize the instrument's geometry and minimize optical aberrations.
  • * To achieve micro-arcsecond accuracy for faint astronomical targets.

Main Methods:

  • * Geometric optimization of the Fizeau interferometer.
  • * Aberration analysis, focusing on distortion and coma.
  • * Simulation of performance for a space mission profile.

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  • * Utilization of Charge-Coupled Devices (CCDs) in time-delay integration mode.

    • Main Results:

    • * A Fizeau interferometer design suitable for a global astrometry mission.
    • * Achieved accuracy of 10 micro-arcseconds at visual magnitude 15.
    • * Capability to observe targets down to visual magnitude 20.
    • * Optimized field of view of 0.7 x 0.7 degrees.

    Conclusions:

    • * The proposed Fizeau interferometer design meets the stringent requirements for space astrometry.
    • * Geometric optimization and aberration control are critical for high-accuracy measurements.
    • * The design enables efficient data acquisition using time-delay integration mode over a wide field of view.