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Orbit and origin of the LL7 chondrite Dishchii'bikoh (Arizona)
Jenniskens, Peter1,2; Moskovitz, Nick3; Garvie, Laurence A. J.4; Yin, Qing-Zhu5; Howell, J. Andreas6; Free, Dwayne L.6; Albers, Jim1; Samuels, David1; Fries, Marc D.7; Mane, Prajkta4,7,8; Dunlap, Daniel R.4; Ziegler, Karen9; Sanborn, Matthew E.5; Zhou, Qin10; Li, Qiu-Li11; Li, Xian-Hua11; Liu, Yu11; Tang, Guo-Qiang11; Welten, Kees C.12; Caffee, Marc W.13,14; Busemann, Henner15; Meier, Matthias M. M.15,16; Nesvorny, David17
AbstractThe trajectory and orbit of the LL7 ordinary chondrite Dishchii'bikoh are derived from low-light video observations of a fireball first detected at 10:56:26 UTC on June 2, 2016. Results show a relatively steep ~21 degrees inclined orbit and a short 1.13 AU semimajor axis. Following entry in Earth's atmosphere, the meteor luminosity oscillated corresponding to a meteoroid spin rate of 2.28 +/- 0.02 rotations per second. A large fragment broke off at 44 km altitude. Further down, mass was lost to dust during flares at altitudes of 34, 29, and 25 km. Surviving meteorites were detected by Doppler weather radar and several small 0.9-29 g meteorites were recovered under the radar reflection footprint. Based on cosmogenic radionuclides and ground-based radiometric observations, the Dishchii'bikoh meteoroid was 80 +/- 20 cm in diameter assuming the density was 3.5 g/cm(3). The meteoroid's collisional history confirms that the unusual petrologic class of LL7 does not require a different parent body than three previously observed LL chondrite falls. Dishchii'bikoh was ejected 11 Ma ago from parent body material that has a 4471 +/- 6 Ma U-Pb age, the same as that of Chelyabinsk (4452 +/- 21 Ma). The distribution of the four known pre-impact LL chondrite orbits is best matched by dynamical modeling if the source of LL chondrites is in the inner asteroid belt in a low inclined orbit, with the highly inclined Dishchii'bikoh being the result of interactions with Earth before impacting.
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000527014600005
Citation statistics
Document Type期刊论文
Corresponding AuthorJenniskens, Peter
Affiliation1.SETI Inst, 189 Bernardo Ave, Mountain View, CA 94043 USA
2.NASA, Ames Res Ctr, Moffett Field, CA 94035 USA
3.Lowell Observ, 1400 West Mars Hill Rd, Flagstaff, AZ 86001 USA
4.Arizona State Univ, Sch Earth & Space Explorat, Ctr Meteorite Studies, Tempe, AZ 85287 USA
5.Univ Calif Davis, Dept Earth & Planetary Sci, Davis, CA 95616 USA
6.SkySentinel LLC SSL, Spalding Allsky Camera Network, Melbourne, FL 32940 USA
7.NASA, Astromat Res & Explorat Sci, Johnson Space Ctr, Houston, TX 77058 USA
8.USRA, Lunar & Planetary Inst, Houston, TX 77058 USA
9.Univ New Mexico, Inst Meteorit, Albuquerque, NM 87131 USA
10.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
11.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
12.Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA
13.Purdue Univ, Dept Phys & Astron, PRIME Lab, W Lafayette, IN 47907 USA
14.Purdue Univ, Dept Earth Atmospher & Planetary Sci, W Lafayette, IN 47907 USA
15.Swiss Fed Inst Technol, Inst Geochem & Petr, CH-8092 Zurich, Switzerland
16.Nat Museum St Gallen, CH-9016 St Gallen, Switzerland
17.SWRI, Dept Space Studies, 1050 Walnut St,Suite 400, Boulder, CO 80302 USA
Recommended Citation
GB/T 7714
Jenniskens, Peter,Moskovitz, Nick,Garvie, Laurence A. J.,et al. Orbit and origin of the LL7 chondrite Dishchii'bikoh (Arizona)[J]. METEORITICS & PLANETARY SCIENCE,2020,55(3):535-557.
APA Jenniskens, Peter.,Moskovitz, Nick.,Garvie, Laurence A. J..,Yin, Qing-Zhu.,Howell, J. Andreas.,...&Nesvorny, David.(2020).Orbit and origin of the LL7 chondrite Dishchii'bikoh (Arizona).METEORITICS & PLANETARY SCIENCE,55(3),535-557.
MLA Jenniskens, Peter,et al."Orbit and origin of the LL7 chondrite Dishchii'bikoh (Arizona)".METEORITICS & PLANETARY SCIENCE 55.3(2020):535-557.
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