Oxygen isotopic compositions of asteroidal materials returned from Itokawa by the Hayabusa mission.
نویسندگان
چکیده
Meteorite studies suggest that each solar system object has a unique oxygen isotopic composition. Chondrites, the most primitive of meteorites, have been believed to be derived from asteroids, but oxygen isotopic compositions of asteroids themselves have not been established. We measured, using secondary ion mass spectrometry, oxygen isotopic compositions of rock particles from asteroid 25143 Itokawa returned by the Hayabusa spacecraft. Compositions of the particles are depleted in (16)O relative to terrestrial materials and indicate that Itokawa, an S-type asteroid, is one of the sources of the LL or L group of equilibrated ordinary chondrites. This is a direct oxygen-isotope link between chondrites and their parent asteroid.
منابع مشابه
Towards understanding the dynamical evolution of asteroid 25143 Itokawa: constraints from sample analysis
The data from the analysis of samples returned by Hayabusa from asteroid 25143 Itokawa are used to constrain the preaccretion history, the geological activity that occurred after accretion, and the dynamical history of the asteroid from the main belt to near-Earth space. We synthesize existing data to pose hypotheses to be tested by dynamical modeling and the analyses of future samples returned...
متن کاملSpace environment of an asteroid preserved on micrograins returned by the Hayabusa spacecraft.
Records of micrometeorite collisions at down to submicron scales were discovered on dust grains recovered from near-Earth asteroid 25143 (Itokawa). Because the grains were sampled from very near the surface of the asteroid, by the Hayabusa spacecraft, their surfaces reflect the low-gravity space environment influencing the physical nature of the asteroid exterior. The space environment was exam...
متن کاملAdvanced robotic system of hopping rovers for small solar system bodies
Japan has announced the official development of “Hayabusa-2”, the second sample return mission to a Near-Earth asteroid. When the development is made smoothly, Hayabusa-2 will be launched in 2014. The predecessor spacecraft “Hayabusa” made a great success when it returned to the Earth in June 2010 with a capsule containing some particles obtained from S-type asteroid “Itokawa.” The authors inst...
متن کاملThe Actual Dynamical Environment About Itokawa
The dynamical environment about and on Asteroid 25143 Itokawa is studied using the shape and rotation state model estimated during the close proximity phase of the Hayabusa mission to that asteroid. We first discuss the general gravitational properties of the shape model assuming a constant density. Next we discuss the actual dynamical environment about this body, both on the surface and in orb...
متن کاملScientific Capability of Minerva Rover in Hayabusa Asteroid Mission
Introduction: The Institute of Space and Astronautical Science (ISAS) of Japan has launched the engineering test spacecraft \HAYABUSA" (formerly called \MUSES-C") to the near Earth asteroid \ITOKAWA (1998SF36)" on May 9, 2003 [1]. HAYABUSA will go to the target asteroid after two years' interplanetary cruise and will descend onto the asteroid surface in 2005 to acquire some fragments, which wil...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Science
دوره 333 6046 شماره
صفحات -
تاریخ انتشار 2011