Asteroid (90) Antiope: Another Icy Member Of The Themis Family?
Keywords
Asteroids; Asteroids, composition; Asteroids, surfaces; Ices, IR spectroscopy; Infrared observations
Abstract
Many members of the Themis family show evidence of hydration in the form of oxidized iron in phyllosilicates (Florczak, M. et al. [1999]. Astron. Astrophys. Suppl. Ser. 134, 463-471), and OH-bearing minerals (Takir, D., Emery, J.P. [2012]. Icarus 219, 641-654). The largest member, (24) Themis, has H2O ice covering its surface (Campins, H. et al. [2010]. Nature 464, 1320-1321; Rivkin, A.S., Emery, J.P. [2010]. Nature 464, 1322-1323). We have investigated the second largest Themis-family asteroid, (90) Antiope, which Castillo-Rogez and Schmidt (Castillo-Rogez, J.C., Schmidt, B.E. [2010]. Geophys. Res. Lett. 37, L10202) predict to have a composition that includes water ice and organics. We obtained 2-4-μm spectroscopy of (90) Antiope in 2006 and 2008, and we find an absorption in the 3-μm region clearly present in our 2008 spectrum and likely in our 2006 spectrum. Both spectra have rounded, bowl-shaped absorptions consistent with those ascribed to water ice as in the spectrum of Asteroid (24) Themis. We also present and compare Spitzer 8-12-μm mid-infrared spectra of (24) Themis and (90) Antiope. We find that (90) Antiope is lacking a "fairy castle" dusty surface, which is in contrast to (24) Themis, other Themis family members (Licandro, J. et al. [2012]. Astron. Astrophys. 537, A73), and Jupiter Trojans (e.g. Emery, J.P., Cruikshank, D.P., Van Cleve, J. [2006]. Icarus 182, 496-512). We conclude that the surface structure of (90) Antiope is most similar to Cybele Asteroid (121) Hermione (Hargrove, K.D. et al. [2012]. Icarus 221, 453-455).
Publication Date
7-1-2015
Publication Title
Icarus
Volume
254
Number of Pages
150-156
Document Type
Article
Personal Identifier
scopus
DOI Link
https://doi.org/10.1016/j.icarus.2015.03.008
Copyright Status
Unknown
Socpus ID
84926652648 (Scopus)
Source API URL
https://api.elsevier.com/content/abstract/scopus_id/84926652648
STARS Citation
Hargrove, Kelsey D.; Emery, Joshua P.; Campins, Humberto; and Kelley, Michael S.P., "Asteroid (90) Antiope: Another Icy Member Of The Themis Family?" (2015). Scopus Export 2015-2019. 363.
https://stars.library.ucf.edu/scopus2015/363