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Article Dans Une Revue Planetary and Space Science Année : 2011

Mercury resolved spectroscopy from NTT

Résumé

Mercury has been observed in June 2006 with the SofI instrument at NTT. Resolved spectroscopy was performed in the 0.94-2.5mum 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 2mum region nor at 1mum. 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.

Dates et versions

hal-03732448 , version 1 (21-07-2022)

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Stéphane Erard, Bruno Bézard, Alain Doressoundiram, Daniela Despan. Mercury resolved spectroscopy from NTT. Planetary and Space Science, 2011, 59, pp.1842-1852. ⟨10.1016/j.pss.2011.07.004⟩. ⟨hal-03732448⟩
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