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Detection of Molecular H2O on Nominally Anhydrous Asteroids
The Planetary Science Journal Pub Date : 2024-02-12 , DOI: 10.3847/psj/ad18b8 Anicia Arredondo , Margaret M. McAdam , Casey I. Honniball , Tracy M. Becker , Joshua P. Emery , Andrew S. Rivkin , Driss Takir , Cristina A. Thomas
The Planetary Science Journal Pub Date : 2024-02-12 , DOI: 10.3847/psj/ad18b8 Anicia Arredondo , Margaret M. McAdam , Casey I. Honniball , Tracy M. Becker , Joshua P. Emery , Andrew S. Rivkin , Driss Takir , Cristina A. Thomas
We used the FORCAST instrument on SOFIA to obtain mid-infrared spectra (4.9–13.7 μ m) of four S-type asteroids: (7) Iris, (11) Parthenope, (18) Melpomene, and (20) Massalia. Three of these four silicate-rich asteroids (Iris, Melpomene, and Massalia) were observed to have 3 μ m features indicative of hydration by McAdam et al. We report a detection of a 6 μ m feature that is unambiguously attributed to molecular water on two asteroids, Iris and Massalia, with peak heights of 4.532% ± 0.011% and 4.476% ± 0.012%, respectively. We estimate the abundance of molecular water based on these peak heights to be 454 ± 202 μ g g−1 and 448 ± 209 μ g g−1, consistent with values found on the sunlit Moon by SOFIA+FORCAST.
更新日期：2024-02-12
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