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Comment on “Comparison of Laboratory Emission Spectra with Mercury Telescopic Data” by A. L. Sprague and T. L. Roush

✍ Scribed by Melissa D. Lane

Publisher: Elsevier Science
Year: 2000
Tongue: English
Weight: 32 KB
Volume: 143
Category: Article
ISSN: 0019-1035
DOI: 10.1006/icar.1999.6279

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✦ Synopsis

The magnetite spectrum in Fig. 3 of A. L. Sprague and T. L. Roush (1998, Icarus 133, 174-183) is of hematite, not magnetite. Regardless, magnetite has no diagnostic fundamental or transparency bands within the spectral range of their Mercury telescopic data; therefore, they should not conclude the absence or paucity of magnetite on Mercury on the basis of the spectral region 7.5 to 12 µm alone.

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The laboratory spectrum published in Fig. 3 of A. L. Sprague and T. L. Roush (1998, Icarus 133, 174-183) is a mixture of magnetite and hematite (∼34-45% magnetite, ∼55-66% hematite) rather than magnetite or hematite (M. D. Lane 2000, Icarus 143, 000-000) alone. Because of the unusual nature of this