Mercury resolved spectroscopy from NTT

Details Mercury resolved spectroscopy from NTT Mercury resolved spectroscopy from NTT

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011p%26ss...59.1842e&link_type=abstract

Planetary and Space Science, Volume 59, Issue 15, p. 1842-1852.

Physics

Scientific paper

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