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Asteroid 1986 DA: Radar Evidence for a Metallic Composition.

S J Ostro, D B Campbell, J F Chandler

    Science (New York, N.Y.)
    |June 7, 1991
    PubMed
    Summary
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    Near-Earth object 1986 DA is highly reflective, suggesting it

    Area of Science:

    • Planetary Science
    • Asteroid Research
    • Astrogeology

    Background:

    • Near-Earth objects (NEOs) are crucial for understanding solar system evolution.
    • Radar observations provide unique insights into asteroid composition and structure.
    • Asteroid 1986 DA exhibits unusual reflectivity compared to other detected asteroids.

    Purpose of the Study:

    • To investigate the composition and origin of near-Earth object 1986 DA.
    • To test the hypothesis of its metallic origin from a larger differentiated body.
    • To explore its potential relationship with iron meteorites.

    Main Methods:

    • Radar observations of asteroid 1986 DA.
    • Analysis of reflectivity data.
    • Comparison with known asteroid and meteorite properties.

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    Main Results:

    • Asteroid 1986 DA shows significantly higher reflectivity than other radar-detected asteroids.
    • Surface morphology is smooth at small scales but irregular at larger scales (10-100 meters).
    • The high reflectivity supports a composition of Nickel-Iron (NiFe) metal.

    Conclusions:

    • 1986 DA is likely a metallic fragment from the interior of a disrupted planetesimal.
    • Its properties align with a differentiated origin and subsequent catastrophic disruption.
    • It may be a piece of, or related to the parent body of, some iron meteorites.