Orbits of Trans-Neptunian Binaries with the ESO VLT

Details Orbits of Trans-Neptunian Binaries with the ESO VLT Orbits of Trans-Neptunian Binaries with the ESO VLT

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dda....41.0910h&link_type=abstract

American Astronomical Society, DDA meeting #41, #9.10; Bulletin of the American Astronomical Society, Vol. 41, p.936

Statistics

Computation

Scientific paper

During the last decades, binary and multiple systems have been found and resolved in the various populations of small Solar System bodies (SSSBs), Near-Earth, main belt, Trojans, Centaurs and trans-Neptunians (or Kuiper belt). The icy/rocky trans-Neptunian binaries (TNBs) show some peculiarities: the proportion of binaries vs. single objects is significant, the orbital period, mass-ratio and eccentricities are relatively large, etc. Besides, being faint bodies (magnitude V>19), they are difficult to observe even with the most performing telescopes, either ground- or space-based (VLT, Keck, CFHT, HST, etc.).
We have undertaken a campaign of observations at the ESO VLT in the near-IR of selected TNBs with NACO and SINFONI instruments. We will be able to derive the spectro-photometry when possible or the colour-photometry of each component separately, as well as their relative position. These mutually complementary datasets will facilitate a physical characterisation of the surface of each individual component, and (when combined with previously published observations) provide a unique solution for the orbit orientation even with scarce data. The study will also test proposed formation scenarios of TNBs.
I will present the on-going observations campaign. I will develop more specifically a method of statistical inversion for the orbit determination and ephemerides computation with some applications for deriving stellar occultation predictions, transits and mutual phenomena, updated total mass (and possibly average density) of the system, inclination and Jacobi constant, non-bound orbits, etc.

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