The 2MASS Asteroid and Comet Survey

Details The 2MASS Asteroid and Comet Survey The 2MASS Asteroid and Comet Survey

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999baas...31.1586s&link_type=abstract

American Astronomical Society, DPS Meeting #31, late abstracts, #59.15; Bulletin of the American Astronomical Society, Vol. 31,

Astronomy and Astrophysics

Astronomy

Scientific paper

Over the course of three years, the Two Micron All Sky Survey (2MASS) will carry out a survey of the entire sky at J (1.25 um), H (1.65), and Ks (2.17 um) from telescopes in the northern and southern hemispheres. The initial public release spans the period between June 7, 1997 and January 30, 1998 and covers 6% of the sky. 2MASS sources associated with asteroids and comets have been compiled into separate catalogs, available at the Small Bodies Node of the NASA Planetary Data Systm (http://pdssbn.astro.umd.edu) and the Infrared Processing and Analysis Center (http://ipac.caltech.edu). The initial catalogs contain 1054 asteroids and 2 comets, respectively. Preliminary analysis shows compositional differences between large and small asteroids in the inner main belt, primarily in J-H, consistent with the results of Gaffey et al. (1993) which found increasing depth of the olivine/pyroxene 1 micron band with decreasing diameter for S-type asteroids. Color-color plots of asteroid families, particularly Koronis, indicate an anti-correlation between strength of the 1 micron band and that of the 2 micron pyroxene band, suggesting some stratigraphy of the parent body. Comparison of the near-infrared colors show considerable overlap between C- and S-type asteroids, as has been shown previously (e.g. Hahn and Lagerkvist 1988). 2MASS offers an unbiased view of their distribution in orbital element space. The apparent distribution of C-type found in the non-overlap color region indicates an increasing gap in orbital inclination interior to about 3 AU. Similarly, the S-type asteroids found in non-overlap color region indicate an increasing inclination gap beyond about 2.5 AU. The sample is still small, but may be suggestive of an artifact of the dynamical evolution of these objects away from their formation locations. The 2MASS catalogs will be updated at regular intervals as the survey progresses. Gaffey, M.J. et al. Icarus 106, 573-602 (1993). Hahn, G. and C.-I. Lagerkvist. Icarus 74, 454-471 (1988).

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