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Space weathering of asteroids: similarities and discrepancies between Main Belt asteroids and NEOs

Published online by Cambridge University Press:  01 August 2006

S. Marchi ,
P. Paolicchi ,
M. Lazzarin  and
S. Magrin
S. Marchi
Affiliation:
Dipartimento di Astronomia, Università di Padova, Vicolo dell'Osservatorio 2, I-35122 Padova, Italy email: simone.marchi@unipd.it; sara.magrin.1@unipd.it; monica.lazzarin@unipd.it
P. Paolicchi
Affiliation:
Dipartimento di Fisica, Università di Pisa, largo Pontecorvo 3, I-56127 Pisa, Italy email: paolicchi@df.unipi.it
M. Lazzarin
Affiliation:
Dipartimento di Astronomia, Università di Padova, Vicolo dell'Osservatorio 2, I-35122 Padova, Italy email: simone.marchi@unipd.it; sara.magrin.1@unipd.it; monica.lazzarin@unipd.it
S. Magrin
Affiliation:
Dipartimento di Astronomia, Università di Padova, Vicolo dell'Osservatorio 2, I-35122 Padova, Italy email: simone.marchi@unipd.it; sara.magrin.1@unipd.it; monica.lazzarin@unipd.it
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Abstract

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A sample of 35 C–complex objects is present among near–Earth objects. In spite of the poor statistics, some striking differences compared to Main Belt asteroids can be established: for instance the percentage of near–Earth objects (NEOs) showing hydration features is very small. Moreover the spectral slope of C–complex NEOs seems to be anti–correlated with the exposure to the ion flux coming from the Sun, in contrast with the general behavior of C–complex Main Belt asteroids (and of most asteroids, in general). We discuss some possible implications and suggest some preliminary partial explanations.

Keywords

asteroidssurface

References

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