Trojan

About: Trojan is a research topic. Over the lifetime, 2028 publications have been published within this topic receiving 33209 citations.

Near-Infrared Spectroscopy of Trojan Asteroids: Evidence for Two Compositional Groups

Abstract: The Trojan asteroids remain quite poorly understood, yet their physical properties provide unique perspective on chemical and dynamical processes that shaped the Solar System. The current study was undertaken to investigate surface compositions of these objects. We present 66 new near-infrared (NIR; 0.7 to 2.5 microns) spectra of 58 Trojans, including members of both the leading and trailing swarms. We also include in the analysis previously published NIR spectra of 13 Trojans (3 of which overlap with the new sample). This data set permits not only a direct search for compositional signatures, but also a search for patterns that may reveal clues to the origin of the Trojans. We do not report any confirmed absorption features in the new spectra. Analysis of the spectral slopes, however, reveals an interesting bimodality among the NIR data. The two spectral groups identified appear to be equally abundant in the leading and trailing swarms. The spectral groups are not a result of family membership; they occur in the background, non-family population. The average albedos of the two groups are the same within uncertainties (0.051\pm0.016 and 0.055\pm0.016). No correlations between spectral slope and any other physical or orbital parameter are detected, with the exception of a possible weak correlation with inclination among the less-red spectral group. Synthesizing these results with previously published properties, we conclude that the two spectral groups represent objects with different intrinsic compositions. We further suggest that while the less-red group originated near Jupiter or in the main asteroid belt, the redder spectral group originated farther out in the Solar System. If correct, the Trojan swarms offer the most readily accessible large reservoir of Kuiper Belt material as well as a unique reservoir for the study of material from the middle part of the solar nebula.

Method and device for detecting webpage Trojan horses

Abstract: The invention discloses a method for detecting webpage Trojan horses. The method includes that a static page of a webpage is subjected to scanning to detect whether malicious codes exist in the webpage; when the malicious codes are detected to exist webpages, whether the address of the webpage is skipped is judged; flow behaviors of the webpage are analyzed if the address of the webpage is skipped, the flow behaviors of the webpage and preset characteristics of a Trojan horse hanging webpage are compared, and whether the webpage is the Trojan horse webpage is judged according to a comparison result. The invention further discloses a device for detecting the webpage Trojan horse. According to the method, by means of scanning of the static page, analysis of webpage flow behaviors and deep analysis of webpage flow, known and unknown bug Trojan horse hanging behaviors can be identified so as to detect whether Trojan horses exist in the accessed webpage so that accuracy for identifying webpage Trojan horses is effectively improved, and false report rates and missing report rates are reduced.