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Binary asteroids in the near-Earth object population.

J L Margot1, M C Nolan, L A M Benner

  • 1California Institute of Technology, MC 150-21, Pasadena, CA 91125, USA. margot@gps.caltech.edu

Science (New York, N.Y.)
|April 16, 2002
PubMed
Summary
This summary is machine-generated.

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Near-Earth asteroid 2000 DP107 is a binary system, likely formed by spin-up and fission. This suggests many larger asteroids may be binaries, impacting planetary defense strategies.

Area of Science:

  • Planetary Science
  • Astronomy
  • Astrophysics

Background:

  • Binary asteroid systems are crucial for understanding asteroid formation and evolution.
  • Near-Earth Asteroids (NEAs) pose potential impact risks, making their characteristics vital for planetary defense.

Purpose of the Study:

  • To analyze the physical and orbital characteristics of the near-Earth asteroid 2000 DP107.
  • To investigate the formation mechanism of binary asteroid systems.

Main Methods:

  • Utilized radar imaging to determine the size and structure of asteroid 2000 DP107.
  • Analyzed orbital parameters (period, semimajor axis) to calculate system mass and density.

Main Results:

  • Asteroid 2000 DP107 consists of an 800m primary and a 300m secondary, orbiting every 1.755 days.

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  • Calculated bulk density of the primary is 1.7 +/- 1.1 g/cm³, suggesting a strengthless body.
  • Observed similar characteristics in other binary NEAs, indicating a common formation pathway.

    • Conclusions:

    • Binary NEAs likely form through spin-up and fission, possibly due to tidal disruption during close planetary encounters.
    • Approximately 16% of NEAs larger than 200m may be binary systems, influencing impact risk assessments.