{"id":1967,"date":"2026-09-12T13:30:00","date_gmt":"2026-09-12T04:30:00","guid":{"rendered":"https:\/\/onepress.co.kr\/index.php\/briefing\/2026-09-12-ryugu-first-generation-parent-en\/"},"modified":"2026-09-12T13:30:00","modified_gmt":"2026-09-12T04:30:00","slug":"2026-09-12-ryugu-first-generation-parent-en","status":"publish","type":"briefing","link":"https:\/\/onepress.co.kr\/index.php\/briefing\/2026-09-12-ryugu-first-generation-parent-en\/","title":{"rendered":"Ryugu\u2019s parent body formed within the Solar System\u2019s first two million years"},"content":{"rendered":"

2026-09-12 13:30 KST<\/strong><\/p>\n

Analysis of samples returned by Hayabusa2 indicates that the body supplying Ryugu\u2019s material formed within roughly two million years of the Solar System\u2019s beginning, more than 4.565 billion years ago.<\/p>\n

The asteroid seen today did not keep the same shape for all that time. The early parent body was disrupted and its fragments later reassembled into Ryugu.<\/p>\n

What was measured?<\/h2>\n

Manganese\u2013chromium dating in carbonate grains provided an age, while oxygen isotopes indicated formation in water at about 90\u00b0C.<\/p>\n

Why temperature matters<\/h2>\n

An ice-rich small body takes time to warm internally. Matching the mineral age and temperature to thermal models let the team work backward to accretion.<\/p>\n

\"Ryugu\u2019s
This AI-generated image explains the topic; it is not a photograph of the actual site, experiment, animal or fossil.<\/figcaption><\/figure>\n

What changes?<\/h2>\n

Ryugu and Ivuna-type meteorite parents appear older than many chondrule-rich carbonaceous bodies, supporting more than one generation of early planetesimals.<\/p>\n

Limits<\/h2>\n

The estimate depends on sampled grains and thermal-model assumptions. It is a model-supported lower age, not a directly observed birth date.<\/p>\n

Next test<\/h2>\n

Comparable measurements in Bennu samples and more meteorites can test when and where carbon-rich parent bodies diverged.<\/p>\n

Primary source and independent checks<\/h2>\n

\ubbf8\uad6d \uad6d\ub9bd\uc758\ud559\ub3c4\uc11c\uad00 \ub17c\ubb38 \uc11c\uc9c0<\/a><\/p>\n

\ud64b\uce74\uc774\ub3c4\ub300\ud559\uad50 \uc5f0\uad6c \ubc1c\ud45c<\/a><\/p>\n

\ub3c4\ucfc4\ub300\ud559\uad50 \uc601\ubb38 \uc5f0\uad6c \ubc1c\ud45c<\/a><\/p>\n

Read in other languages<\/h2>\n

\ud55c\uad6d\uc5b4<\/a> \u00b7 English<\/a> \u00b7 Espa\u00f1ol<\/a> \u00b7 \u65e5\u672c\u8a9e<\/a> \u00b7 Ti\u1ebfng Vi\u1ec7t<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Carbonate ages and formation temperatures date the parent body to more than 4.565 billion years ago. That is not the surface age of present-day Ryugu.<\/p>\n","protected":false},"featured_media":0,"template":"","meta":[],"class_list":["post-1967","briefing","type-briefing","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/onepress.co.kr\/index.php\/wp-json\/wp\/v2\/briefing\/1967","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/onepress.co.kr\/index.php\/wp-json\/wp\/v2\/briefing"}],"about":[{"href":"https:\/\/onepress.co.kr\/index.php\/wp-json\/wp\/v2\/types\/briefing"}],"wp:attachment":[{"href":"https:\/\/onepress.co.kr\/index.php\/wp-json\/wp\/v2\/media?parent=1967"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}