Journal of The Korean Astronomical Society (천문학회지)

The Korean Astronomical Society (한국천문학회)
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NEAR-EARTH OBJECT SURVEY SIMULATIONS WITH A REVISED POPULATION MODEL

  • Moon, Hong-Kyu (Korea Astronomy and Space Science Institute) ;
  • Byun, Yong-Ik (Department of Astronomy, Yonsei University) ;
  • Yim, Hong-Suh (Korea Astronomy and Space Science Institute) ;
  • Raymond, Sean N. (NASA Postdoctoral Fellow, Center for Astrophysics and Space Astronomy, University of Colorado)
  • Published : 2008.02.29
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Abstract

We carried out a set of simulations to reproduce the performance of wide-field NEO surveys based on the revised population model of Near Earth Objects (NEOs) constructed by Morbidelli (2006). This is the first time where the new model is carefully compared with discovery statistics, and with the exception of population model, the simulation is identical to the procedure described in Moon et al. (2008). Our simulations show rather large discrepancy between the number of NEO discoveries made by the actual and the simulated surveys. First of all, unlike Bottke et al. (2002)'s, Morbidelli (2006)'s population model overestimates the number of NEOs. However, the latter reproduces orbit distributions of the actual population better. Our analysis suggests that both models significantly underestimate Amors, while overestimating the number of Apollos. Our simulation result implies that substantial modifications of both models are needed for more accurate reproduction of survey observations. We also identify Hungaria region (HU) to be one of the most convincing candidates that supply a large fraction of asteroids to the inner Solar System.

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References

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