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UID:b1a42957-011d-46f8-9e2a-fb8304e17063@nexttoyou
DTSTAMP:20261106T174507Z
DTSTART:20261112T203000Z
DTEND:20261112T213000Z
SUMMARY:Cornell Department of Astronomy & Space Sciences Fall 2026 Colloqu
 ium Series
LOCATION:Space Sciences Building 105
DESCRIPTION:Title: Exploring New and Familiar Worlds with Planetary Geolog
 ic Mapping\n\nAbstract: In this talk I will focus on my recent work of ge
 ologic mapping and interpretation of the new world of asteroid (52246) Do
 naldjohanson\, target of NASA’s Lucy mission\, and of the Marius Hills re
 gion of our familiar neighboring world\, the Moon.\n\nThe Lucy mission wi
 ll study the Jupiter Trojan asteroids\, which are early Solar System reli
 cs yet to be explored by a spacecraft (Levison+2021). Prior to the first 
 Trojan encounter\, Lucy flew by two never-before-visited main-belt astero
 ids: asteroid (152830) Dinkinesh in 2023 (Levison+2024) and asteroid (522
 46) Donaldjohanson in 2025 (Marchi+2026). Here I will present the first g
 eologic map of the observed portion of Donaldjohanson\, which is ~8 km lo
 ng and appears to be an elongated contact binary composed of two lobes (t
 he bigger named Olduvai Lobus and the smaller Afar Lobus) joined by a nar
 rower neck (named Windover Collum). We infer that mass wasting flowed fro
 m Olduvai Lobus to Windover Collum and from Windover Collum to Afar Lobus
 . We also observe that the chains of depressions and grooves have a prefe
 rred orientation and potential en echelon patterns\, which we interpret a
 s pit chains (see also Nichols-Fleming+2026). We use boulders to estimate
  the thickness of the outer layer of looser material to be between ~17 m 
 to ~33 m deep. We also discuss how these geomorphological observations co
 rrelate with modeling of the spin period and surface accelerat\n\nhttp://
 next-to-u.app/events/b1a42957-011d-46f8-9e2a-fb8304e17063
URL:http://next-to-u.app/events/b1a42957-011d-46f8-9e2a-fb8304e17063
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