Buscar
Mostrando ítems 21-30 de 58
Análisis dinámico del grupo de asteroides Hungaria
(2019)
Entre el planeta Marte y el borde interno del cinturón principal de asteroides se encuentra la región de asteroides Hungaria (1,77 UA < a < 2,06 UA). Estos objetos se hallan rodeados por las resonancias seculares ν5 , ν6 ...
Infrared Spectroscopy of Carbonaceous-chondrite Inclusions in the Kapoeta Meteorite: Discovery of Nanodiamonds with New Spectral Features and Astrophysical Implications
(IOP Publishing, 2018-03-22)
We report the finding of nanodiamonds, coexisting with amorphous carbon, in carbonaceous-chondrite (CC) material from the Kapoeta achondritic meteorite by Fourier-transform infrared (FTIR) spectroscopy and micro-Raman ...
Size and density sorting of dust grains in SPH simulations of protoplanetary discs
(OXFORD UNIV PRESS, 2017)
The size and density of dust grains determine their response to gas drag in protoplanetary discs. Aerodynamical (size x density) sorting is one of the proposed mechanisms to explain the grain properties and chemical ...
Ground-Based Observational Techniques for Meteoroid Lunar Impact Generated Electromagnetic Pulses and Lunar Sub-Surface Structure Detection
(The Pennsylvania State University, 2017-08)
The lunar surface is pockmarked with large and small craters mostly formed due to meteoroid impacts on the Moon. Most of the craters formed are not erased with time due to lack of "weathering" processes such as no atmosphere ...
De vástagos meteoroides y otras hierofanías
'De vastagos, meteoroides y otras hierofanias' es una propuesta visual fundamentada en el ensamblaje de esculturas en equilibrio a partir de elementos encontrados durante mis andares. Debo hablar, en términos formales, de ...
Diurnal variation of non-specular meteor trails
(European Geosciences Union, 2009-05-04)
We present results of simulated radar observations of meteor trails in an effort to show how non-specular meteor trails are expected to vary as a function of a number of key atmospheric, ionospheric and meteoroid parameters. ...
The Carancas meteorite impact crater, Peru: Geologic surveying and modeling of crater formation and atmospheric passage
(The Meteoritical SocietyUS, 2009-07)
The recent Carancas meteorite impact event caused a worldwide sensation. An H4–5 chondrite struck the Earth south of Lake Titicaca in Peru on September 15, 2007, and formed a crater 14.2 m across. It is the smallest, ...
The remarkable solar twin HIP 56948: a prime target in the quest for other Earths
(EDP SCIENCES S ALES ULIS CEDEX A, 2012)
Context. The Sun shows abundance anomalies relative to most solar twins. If the abundance peculiarities are due to the formation of inner rocky planets, that would mean that only a small fraction of solar type stars may ...
Irradiation of nitrogen-rich ices by swift heavy ions: clues for the formation of ultracarbonaceous micrometeorites
(2015)
Context. Extraterrestrial materials, such as meteorites and interplanetary dust particles, provide constraints on the formation and evolution of organic matter in the young solar system. Micrometeorites represent the ...
Aspect sensitivity considerations in interpreting radar meteor range-spread trail echo durations
(Springer, 2007-12)
Initial results from June 2006 50 MHz radar campaigns at the Jicamarca Radio Observatory (JRO) reveal that full understanding of Range-Spread Trail Echoes (RSTEs) must involve knowledge of the trail viewing angle relative ...