Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8136496 | Icarus | 2015 | 13 Pages |
Abstract
We obtained 2-4 μm spectra of six M-type asteroids using the SpeX spectrograph at NASA's Infrared Telescope Facility. We find evidence for hydrated minerals on all six asteroids, including two that were previously thought to be dry. One of our targets, (216) Kleopatra, shows rotational variability in the depth of its 3-μm feature. We also studied three of these asteroids in the 0.8-2.4 μm range using the NICS instrument at the Telescopio Nazionale Galileo (TNG) in La Palma, Spain. The discovery of spectral signatures of hydrated minerals on so many M-types is difficult to reconcile with a highly thermally evolved composition. It has been suggested that the hydrated minerals could have been delivered to M-types via impacts with primitive objects, or that the M-types may actually have primitive compositions that are not represented in meteorite collections. Understanding the origin and type of hydration on these asteroids will help determine which of these interpretations is correct.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Space and Planetary Science
Authors
Zoe A. Landsman, Humberto Campins, Noemà Pinilla-Alonso, Josef Hanuš, Vania Lorenzi,