Small Solar System bodies; Asteroids; Main belt asteroids; surfaces
Abstract :
[en] The surfaces of airless bodies like asteroids in the solar system are known to be affected by space weathering. Experiments simulating space weathering are essential for studying the effects of this process on meteorite samples, but the problem is that the time spent to reproduce space weathering in these experiments is billions of times shorter than the actual phenomenon. In 2010 December, the T-type asteroid 596 Scheila underwent a collision with an impactor a few tens of meters in size. A decade later, there is an opportunity to study how the surface layer of this asteroid is being altered by space weathering after the impact. To do so, we performed visible spectrophotometric and near-infrared spectroscopic observations of 596 Scheila. The acquired spectrum is consistent with those observed shortly after the 2010 impact event within the observational uncertainty range. This indicates that the surface color of dark asteroids is not noticeably changed by space weathering over a 10 yr period. This study is the first to investigate color changes due to space weathering on an actual asteroid surface in the solar system. Considering that fresh layers are regularly created on asteroid surfaces by collisions, we suggest a genetic link between D/T-type and dark (low albedo) X-complex asteroids and very red objects such as 269 Justitia, 732 Tjilaki, and 203 Pompeja. New observations show that 203 Pompeja has an X-type-like surface, with some local surface areas exhibiting a very red spectrum.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Hasegawa, Sunao; JAXA, Institute of Space and Astronautical Science
DeMeo, Francesca E.; MIT, Department of Earth and Planetary Science
Marsset, Michaël; MIT, Department of Earth and Planetary Science, European Southern Observatory, Chile
Hanuš, Josef; Charles University, Faculty of Mathematics and Physics, Institute of Astronomy, V Holešovičkách 2, CZ-18000, Prague 8, Czech Republic
Avdellidou, Chrysa; Observatoire de la Cote d'Azur, France
Delbo, Marco; Observatoire de la Cote d'Azur, France
Bus, Schelte J.; University of Hawaii, Manoa, Institute for Astronomy
Hanayama, Hidekazu; National Astronomical Observatory of Japan
Horiuchi, Takashi; University of Tokyo, Institute of Astronomy
Takir, Driss; NASA Johnson Space Center
Jehin, Emmanuel ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Ferrais, Marin ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa) ; Aix-Marseille Universite, Laboratoire d'Astrophysique
Geem, Jooyeon; Seoul National University, Department of Physics and Astronomy, Seoul National University, Department of Physics and Astronomy
Im, Myungshin; Seoul National University, Department of Physics and Astronomy, Seoul National University, Department of Physics and Astronomy
Seo, Jinguk; Seoul National University, Department of Physics and Astronomy, Seoul National University, Department of Physics and Astronomy
Bach, Yoonsoo P.; Seoul National University, Department of Physics and Astronomy, Seoul National University, Department of Physics and Astronomy
Jin, Sunho; Seoul National University, Department of Physics and Astronomy, Seoul National University, Department of Physics and Astronomy
Ishiguro, Masateru; Seoul National University, Department of Physics and Astronomy, Seoul National University, Department of Physics and Astronomy
Kuroda, Daisuke; Japan Spaceguard Association
Binzel, Richard P.; MIT, Department of Earth and Planetary Science
Nakamura, Akiko M.; Kobe University, Center for Planetary Science
Yang, Bin; Núcleo de Astronomía, Facultad de Ingenieríay Ciencias, Universidad Diego Portales, Av. Ejercito 441, Santiago, Chile
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