> Details

Rivkin, Andrew S.; Thomas, Cristina A.; Wong, Ian; Rozitis, Benjamin; de León, Julia; Holler, Bryan; Milam, Stefanie N.; Howell, Ellen S.; Hammel, Heidi B.; Arredondo, Anicia; Brucato, John R.; Epifani, Elena M.; Ieva, Simone; La Forgia, Fiorangela; Lucas, Michael P.; Lucchetti, Alice; Pajola, Maurizio; Poggiali, Giovanni; Sunshine, Jessica N.; Trigo-Rodríguez, Josep M.

Near to Mid-infrared Spectroscopy of (65803) Didymos as Observed by JWST: Characterization Observations Supporting the Double Asteroid Redirection Test

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  • Media type: E-Article
  • Title: Near to Mid-infrared Spectroscopy of (65803) Didymos as Observed by JWST: Characterization Observations Supporting the Double Asteroid Redirection Test
  • Contributor: Rivkin, Andrew S.; Thomas, Cristina A.; Wong, Ian; Rozitis, Benjamin; de León, Julia; Holler, Bryan; Milam, Stefanie N.; Howell, Ellen S.; Hammel, Heidi B.; Arredondo, Anicia; Brucato, John R.; Epifani, Elena M.; Ieva, Simone; La Forgia, Fiorangela; Lucas, Michael P.; Lucchetti, Alice; Pajola, Maurizio; Poggiali, Giovanni; Sunshine, Jessica N.; Trigo-Rodríguez, Josep M.
  • imprint: American Astronomical Society, 2023
  • Published in: The Planetary Science Journal
  • Language: Not determined
  • DOI: 10.3847/psj/ad04d8
  • ISSN: 2632-3338
  • Keywords: Space and Planetary Science ; Earth and Planetary Sciences (miscellaneous) ; Geophysics ; Astronomy and Astrophysics
  • Origination:
  • Footnote:
  • Description: <jats:title>Abstract</jats:title> <jats:p>The Didymos binary asteroid was the target of the Double Asteroid Redirection Test (DART) mission, which intentionally impacted Dimorphos, the smaller member of the binary system. We used the Near-Infrared Spectrograph and Mid-Infrared Instrument instruments on JWST to measure the 0.6–5 and 5–20 <jats:italic>μ</jats:italic>m spectra of Didymos approximately two months after the DART impact. These observations confirm that Didymos belongs to the S asteroid class and is most consistent with LL chondrite composition, as was previously determined from its 0.6–2.5 <jats:italic>μ</jats:italic>m reflectance spectrum. Measurements at wavelengths &gt;2.5 <jats:italic>μ</jats:italic>m show Didymos to have thermal properties typical for an S-complex asteroid of its size and to be lacking absorptions deeper than ∼2% due to OH or H<jats:sub>2</jats:sub>O. Didymos’ mid-infrared emissivity spectrum is within the range of what has been measured on S-complex asteroids observed with the Spitzer Space Telescope and is most consistent with emission from small (&lt;25 <jats:italic>μ</jats:italic>m) surface particles. We conclude that the observed reflectance and physical properties make the Didymos system a good proxy for the type of ordinary chondrite asteroids that cross near-Earth space, and a good representative of likely future impactors.</jats:p>
  • Access State: Open Access