Mercury resolved spectroscopy from NTT |
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| Authors: | Stéphane Erard Bruno Bézard Alain Doressoundiram Daniela Despan |
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| Institution: | LESIA, Observatoire de Paris, CNRS, UPMC, Université Paris-Diderot, 5 place Jules Janssen, 92195 Meudon, France |
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| Abstract: | Mercury has been observed in June 2006 with the SofI instrument at NTT. Resolved spectroscopy was performed in the  range. The observations were acquired close to a favorable quadrature with maximum elongation, and span mostly the southern hemisphere in the 235–315°E longitude area.In contrast to recent observations from IRTF, the present study does not indicate any pyroxene absorption in the near-infrared range, neither in the  region nor at  . Detailed spectral analysis allows to derive an upper limit of 1.5% type-A pyroxene (hedenbergite) or 1.1% enstatite (assuming minimum lunar iron content) in the regions observed, at the 700 km scale. Assuming lunar-like maturity effects on band depth, this corresponds to an upper limit of 0.15 and 0.6 wt.% FeO content in silicates, an order of magnitude less than previous estimates. |
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| Keywords: | Planets: Mercury Ground-based observations Techniques: Spectroscopy Spectrophotometry Infrared observations |
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