{"id":38760,"date":"2025-07-18T15:47:05","date_gmt":"2025-07-18T13:47:05","guid":{"rendered":"https:\/\/karmaka.de\/?p=38760"},"modified":"2025-07-18T15:50:52","modified_gmt":"2025-07-18T13:50:52","slug":"thermal-ir-observations-of-152830-dinkinesh-during-the-lucy-mission-flyby","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=38760","title":{"rendered":"Thermal-IR Observations of (152830) Dinkinesh during the Lucy Mission FlybyOPEN ACCESS<\/span> "},"content":{"rendered":"\n

Samuel L. Jackson, Joshua P. Emery, Benjamin Rozitis, Philip R. Christensen, John R. Spencer, Stefano Mottola, Victoria E. Hamilton, Carly J. A. Howett, Simone Marchi, Keith S. Noll<\/p>\n\n\n\n

The Planetary Science Journal, Volume 6, Number 7, Published 2025 July 17<\/p>\n\n\n\n

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“NASA\u2019s Lucy spacecraft flew by the main-belt asteroid (152830) Dinkinesh on 2023 November 1, providing a test of its instruments and systems prior to its encounters with the Jupiter Trojans and enabling an opportunity for scientific investigation of this asteroid. Analysis of disk-integrated radiance spectra of Dinkinesh collected by the Lucy Thermal Emission Spectrometer (L\u2019TES) instrument during the close approach reveals a thermal inertia for Dinkinesh of 91 \u00b1 24 J m\u22122 K\u22121 s\u22121\/2 and a surface roughness of 35\u00b0 \u00b1 7\u00b0 rms slope. These values for the thermal inertia and surface roughness are comparable to values derived for other small S-type asteroids such as (65803) Didymos. The Dinkinesh flyby also provided the opportunity to develop new techniques for extracting data when the target body does not fill the field of view of the L\u2019TES instrument, which proved challenging for predecessors of this instrument such as OTES on OSIRIS-REx. The grain size of the regolith of Dinkinesh, estimated to be r =1.2 -0.6\/+ 0.9 mm, is below expected trends with size but is comparable to that of similarly sized asteroids that are either binaries or may have undergone rotational fission in the past. These findings imply that fine-grained materials are being preferentially retained on the primaries of multiple systems, either by cohesive forces or by redeposition after impact events on the secondaries.”<\/p>\n\n\n\n

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