{"id":40074,"date":"2026-01-29T19:00:51","date_gmt":"2026-01-29T18:00:51","guid":{"rendered":"https:\/\/karmaka.de\/?p=40074"},"modified":"2026-01-29T19:01:44","modified_gmt":"2026-01-29T18:01:44","slug":"composition-and-space-weathering-characteristics-of-the-tianwen-2-missions-first-target-near-earth-asteroid-469219-kamooalewa","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=40074","title":{"rendered":"Composition and Space-weathering Characteristics of the Tianwen-2 Mission\u2019s First Target: Near-Earth Asteroid (469219) Kamo\u2018oalewa<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>Minge Liu, Yazhou Yang, Yang Liu, Jian-Yang Li, Qing Zhang, Jiang Zhang, and Yongliao Zou<\/p>\n\n\n\n<p>The Astrophysical Journal Letters, Volume 997, Number 2, Published 29 January 2026<\/p>\n\n\n\n<p><a href=\"https:\/\/iopscience.iop.org\/article\/10.3847\/2041-8213\/ae3826\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><br><a href=\"https:\/\/iopscience.iop.org\/article\/10.3847\/2041-8213\/ae3826\/pdf\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;The near-Earth asteroid Kamo\u2018oalewa, a quasi-satellite of the Earth and the first target for sample return by China\u2019s Tianwen-2 mission, exhibits distinctive spectral characteristics. This study reanalyzes the visible and near-infrared reflectance spectrum of Kamo\u2018oalewa published by B. N. L. Sharkey et al. This study analyzes the visible and near-infrared reflectance spectrum of Kamo\u2018oalewa, obtained using the Large Binocular Telescope, to infer its mineral composition and space-weathering characteristics. Spectral similarity analysis is performed, by comparing the spectrum of Kamo\u2018oalewa to mean spectra of various types in the Bus\u2013DeMeo taxonomy, to make a preliminary constraint on the combined characteristics of surface mineralogy and space-weathering effects. To further characterize the mineral composition, a detailed analysis of the 1 \u03bcm band center is conducted, based on spectral data below 1.25 \u03bcm that have higher signal-to-noise ratios and more bands. Empirical models for normalized spectra are developed to estimate the Is\/FeO content. The results suggest that asteroid Kamo\u2018oalewa has a higher olivine abundance than typical S-type asteroids and the Moon, exhibiting an immature to submature degree of space weathering. These findings enhance our understanding of the evolution of similar quasi-satellites and provide important implication for the future explorations of the Tianwen-2 mission.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Minge Liu, Yazhou Yang, Yang Liu, Jian-Yang Li, Qing Zhang, Jiang Zhang, and Yongliao Zou The Astrophysical Journal Letters, Volume 997, Number 2, Published 29 January 2026 LINK (OPEN ACCESS)PDF (OPEN ACCESS) &#8220;The near-Earth asteroid&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[77,130,181,3504,1184],"tags":[6650,1854,1771,4827,1479,270,673,6677,1674,1909],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/40074"}],"collection":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=40074"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/40074\/revisions"}],"predecessor-version":[{"id":40075,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/40074\/revisions\/40075"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=40074"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=40074"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=40074"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}