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Photomultiplier for optically probing Comet Halley.

F Giovane, G Eichhorn, J McKisson

    Applied Optics
    |August 12, 2010
    PubMed
    Summary

    A novel, low-mass photopolarimeter on the Giotto spacecraft measured comet Halley's color and polarization without moving parts. This enabled detailed analysis of the comet's coma composition and structure.

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    Area of Science:

    • * Planetary Science and Space Exploration
    • * Cometary Physics and Dust Analysis

    Background:

    • * Understanding the composition and physical properties of cometary comas is crucial for planetary science.
    • * Previous methods for analyzing cometary dust often involved complex instrumentation with moving parts.

    Purpose of the Study:

    • * To develop and deploy a novel, low-mass photopolarimeter for the Giotto spacecraft.
    • * To measure the color and linear polarization of Comet Halley's coma.
    • * To analyze the composition and structure of the cometary coma using advanced optical techniques.

    Main Methods:

    • * Development of an eight-color channel photopolarimeter with no moving parts.
    • * Utilization of spacecraft spin, a multichannel plate photomultiplier, and a unique optical design for data acquisition.

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  • * Data collection during the Giotto spacecraft's passage through Comet Halley's coma in March 1986.

    • Main Results:

    • * Successful collection of color and linear polarization data from Comet Halley's coma.
    • * Demonstration of a robust instrument design capable of functioning in a cometary environment.
    • * Presentation of preliminary results regarding the coma's properties.

    Conclusions:

    • * The developed photopolarimeter is an effective instrument for cometary coma analysis.
    • * The instrument's design offers advantages in terms of mass and mechanical simplicity.
    • * The collected data provides valuable insights into the physical and chemical nature of Comet Halley.