Results 291 to 300 of about 446,310 (340)
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2017
The chances of a random piece of rock striking Earth still exists, but probably to a much reduced level of threat. During the early years in the creation of our Solar System, there was plenty of debris that had yet to settle into some form and order, with constant collisions of large bodies before any structure was imposed.
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The chances of a random piece of rock striking Earth still exists, but probably to a much reduced level of threat. During the early years in the creation of our Solar System, there was plenty of debris that had yet to settle into some form and order, with constant collisions of large bodies before any structure was imposed.
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The Near-Earth Object Population
Icarus, 2000We examine the dynamics of a sample of 117 near-Earth objects (NEOs) over a time scale of 60 Myr. We find that while 10–20% end their lifetimes by striking a terrestrial planet (usually Venus or Earth), more than half end their lives in a Sun-grazing state, and about 15% are ejected from the Solar System.
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INEO—Imaging of near-Earth objects
Acta Astronautica, 1994Abstract INEO is a program of four explorer flyby missions for imaging near-Earth objects by means of small spin stabilized spacecrafts. A low-cost approach is achieved by using existing hardware and available scientific instrumentation. For the first mission the payload consists of the flight space model of the Halley multicolour camera and three ...
H. Iglseder +13 more
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2005
In this paper we present visible and near-infrared spectroscopy of 7 peculiar NEOs. These objects have been observed within the SINEO (Spectral Investigation of Near-Earth Objects) survey, which have produced more then 100 spectra of NEOs. Among the objects presented here, five of them result to be spectrally peculiar, belonging to the rare V and R ...
MARCHI, SIMONE +2 more
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In this paper we present visible and near-infrared spectroscopy of 7 peculiar NEOs. These objects have been observed within the SINEO (Spectral Investigation of Near-Earth Objects) survey, which have produced more then 100 spectra of NEOs. Among the objects presented here, five of them result to be spectrally peculiar, belonging to the rare V and R ...
MARCHI, SIMONE +2 more
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A Near‐Earth Object Hazard Index
Annals of the New York Academy of Sciences, 1997ABSTRACT: With the advent of expanded near‐Earth object (NEO) surveys, the number of known close approaches to Earth will increase dramatically. For many of these objects, uncertainties in their preliminary orbits will result in calculations yielding nonzero probabilities of collision over the next century. An index system is proposed which places the
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Next generation near earth object surveys
2009Since its formation the Earth, as well as all the bodies of the Solar System, have been bombarded by cosmic debris whose size varies between a fraction of a millimiter and tens of km. The frequency of these impacts depends on the projectile's dimension and dynamical state; their computed characteristic timescales are, respectively, between minutes and ...
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Near-Earth Object Surveyor Overview
2022 IEEE Aerospace Conference (AERO), 2022Tom Hoffman +12 more
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The SRT, near-earth objects and space debris
2006The improvements, by means of radar observations, of the accuracy with which the orbits of near Earth asteroids and comets are determined are a key factor in order to be able to exclude future collisions of any of these bodies with the Earth. The SRT, once equipped with a suitable transmitter, can have an important role in this context.
VALSECCHI G. B +3 more
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A nearby long gamma-ray burst from a merger of compact objects
Nature, 2022Eleonora Troja +2 more
exaly
ExploreNEOs: The Warm Spitzer Near Earth Object survey
2011We are carrying out the ExploreNEOs project in which we observe more than 600 near Earth Objects (NEOs) at 3.6 and 4.5 microns with Warm Spitzer. For each NEO we derive diameter and albedo. We present our results to date, which include studies of individual objects, results for our entire observed sample, and, by extrapolation, results for the entire ...
Trilling, D. E. +20 more
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