Vol 17, No 2

Optical spectroscopy and photometry of main-belt asteroids with a high orbital inclination

Aya Iwai, Yoichi Itoh, Tsuyoshi Terai, Ranjan Gupta, Asoke Sen, Jun Takahashi


Abstract We carried out low-resolution optical spectroscopy of 51 main-belt asteroids, most of which have highly-inclined orbits. They are selected from D-type candidates in the SDSS-MOC 4 catalog. Using the University of Hawaii 2.2 m telescope and the Inter-University Centre for Astronomy and Astrophysics 2 m telescope in India, we determined the spectral types of 38 asteroids. Among them, eight asteroids were classified as D-type asteroids. Fractions of D-type asteroids are 3.0 ± 1.1% for low orbital inclination main-belt asteroids and 7.3 ± 2.0% for high orbital inclination main-belt asteroids. The results of our study indicate that some D-type asteroids were formed within the ecliptic region between the main belt and Jupiter, and were then perturbed by Jupiter.


Keywords minor planets, asteroids: general — techniques: spectroscopic

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