Results 51 to 60 of about 37,088 (220)
Thermochemical equilibrium calculations of high-temperature O2 generation on the early Earth: Giant asteroid impact on land [PDF]
Journal of the Serbian Chemical Society, 2003 Earth’s atmosphere is composed primarily of N2 and O2. The origin of free O2 in the early Earth’s atmosphere is still subject of considerable debate.1 Theoretical models suggest that the initial form of free O2 in the atmosphere has been oceanic H2O ...
Premović Pavle I.
doaj +1 more source
Asteroid taxonomic signatures from photometric phase curves [PDF]
, 2012 We explore the correlation between an asteroid's taxonomy and photometric phase curve using the H, G12 photometric phase function, with the shape of the phase function described by the single parameter G12. We explore the usability of G12 in taxonomic classification for individual objects, asteroid families, and dynamical groups.
arxiv +1 more source
Asteroid Surface Geophysics [PDF]
, 2015 28 pages, 8 figures. Chapter to appear in the book ASTEROIDS IV, (University of Arizona Press) Space Science Series, edited by P. Michel, F.
Murdoch, Naomi +3 more
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Asteroid Ryugu before the Hayabusa2 encounter
Progress in Earth and Planetary Science, 2018 Asteroid (162173) Ryugu is the target object of Hayabusa2, an asteroid exploration and sample return mission led by Japan Aerospace Exploration Agency (JAXA).
Koji Wada +34 more
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Ion Beam Shepherd for Asteroid Deflection [PDF]
arXiv, 2011 We present a novel concept to impart a continuous thrust to an Earth threatening asteroid from a hovering spacecraft without need for physical attachment nor gravitational interaction with the asteroid. The concept involves an ion thruster placed at a distance of a few asteroid diameters directing a stream of quasi-neutral plasma against the asteroid ...
arxiv
Anticipating Formation Trends of Binary and Multiple Asteroids in the Main Asteroid Belt Due to Electric Discharge Effects by Using the relation of the Sun's Activity and Binary Asteroids Aggregation Statistics [PDF]
arXiv, 2019 Asteroids are classified as tiny and light objects in the solar system, however some of them possess orbiting moons. According to surveys, 15% of near-earth asteroids have moons. The Electrical Discharge effect provides a new model that describes the formation of single, binary, and triple asteroids influenced by solar magnetic activity.
arxiv
Compositional Diversity Among Primitive Asteroids [PDF]
, 2018 Spectroscopic observations from the ultraviolet to the mid-infrared have revealed new and diagnostic differences among primitive asteroids. We review the spectral characteristics of these asteroids and their inferred compositional and physical properties.
arxiv +1 more source
EURONEAR: Data mining of asteroids and Near Earth Asteroids [PDF]
Astronomische Nachrichten, 2009 AbstractBesides new observations, mining old photographic plates and CCD image archives represents an opportunity to recover and secure newly discovered asteroids, also to improve the orbits of Near Earth Asteroids (NEAs), Potentially Hazardous Asteroids (PHAs) and Virtual Impactors (VIs). These are the main research aims of the EURONEAR network.
Birlan, Mirel +21 more
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IEEE Journal of Selected Topics in Applied Earth Observations and Remote SensingIn China's Tianwen-2 mission, a dual-frequency radar will be carried out to detect the asteroid 2016 HO3. The dual-frequency radar can acquire the information of the asteroid's surface and internal structure. There are few studies about the
Niutao Liu, Ya-Qiu Jin, Feng Xu
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IEEE Access, 2019 An adaptive control law is proposed in this paper for body-fixed hovering over an asteroid with an unknown gravity field and an unknown rotation rate. The unknown parameters and irregular shape of an asteroid make the hovering problem challenging.
Bo Zhang, Yuanli Cai
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