scholarly journals Understanding the evolution of Atira-class asteroid 2019 AQ3, a major step towards the future discovery of the Vatira population

2019 ◽  
Vol 487 (2) ◽  
pp. 2742-2752 ◽  
Author(s):  
C de la Fuente Marcos ◽  
R de la Fuente Marcos
Keyword(s):  
Average Distance ◽  
Orbital Evolution ◽  
Recent Past ◽  
Major Step ◽  
Secular Dynamics ◽  
The Earth ◽  
The Future ◽  
Combined Action ◽  
Invariable Plane ◽  
Early Indication

ABSTRACT Orbiting the Sun at an average distance of 0.59 au and with the shortest aphelion of any known minor body, at 0.77 au, the Atira-class asteroid 2019 AQ3 may be an orbital outlier or perhaps an early indication of the presence of a new population of objects: those following orbits entirely encompassed within that of Venus, the so-called Vatiras. Here, we explore the orbital evolution of 2019 AQ3 within the context of the known Atiras to show that, like many of them, it displays a present-day conspicuous coupled oscillation of the values of eccentricity and inclination, but no libration of the value of the argument of perihelion with respect to the invariable plane of the Solar system. The observed dynamics is consistent with being the result of the combined action of two dominant perturbers, the Earth–Moon system and Jupiter, and a secondary one, Venus. Such a multiperturber-induced secular dynamics translates into a chaotic evolution that can eventually lead to a resonant behaviour of the Lidov–Kozai type. Asteroid 2019 AQ3 may have experienced brief stints as a Vatira in the relatively recent past and it may become a true Vatira in the future, outlining possible dynamical pathways that may transform Atiras into Vatiras and vice versa. Our results strongly suggest that 2019 AQ3 is only the tip of the iceberg: a likely numerous population of similar bodies may remain hidden in plain sight, permanently confined inside the Sun’s glare.

When Silence Strikes: Derrida, Heidegger, Mallarmé

2018 ◽  
Vol 40 (2) ◽  
pp. 238-262
Author(s):  
Rodrigo Therezo
Keyword(s):  
The Earth ◽  
The Future ◽  
The Way

This paper attempts to rethink difference and divisibility as conditions of (im)possibility for love and survival in the wake of Derrida's newly discovered—and just recently published—Geschlecht III. I argue that Derrida's deconstruction of what he calls ‘the grand logic of philosophy’ allows us to think love and survival without positing unicity as a sine qua non. This hypothesis is tested in and through a deconstructive reading of Heidegger's second essay on Trakl in On the Way to Language, where Heidegger's phonocentrism and surreptitious nationalism converge in an effort to ‘save the earth’ from a ‘degenerate’ Geschlecht that cannot survive the internal diremption between Geschlechter. I show that one way of problematizing Heidegger's claim is to point to the blank spaces in the ‘E i n’ of Trakl's ‘E i n Geschlecht’, an internal fissuring in the very word Heidegger mobilizes in order to secure the future of mankind.

Dombey and Son

2008 ◽  
Author(s):  
Charles Dickens ◽  
Dennis Walder
Keyword(s):  
Family Relationships ◽  
The Sun ◽  
The Novel ◽  
The Earth ◽  
The Future ◽  
Original Illustrations ◽  
The One

Dombey and Son ... Those three words conveyed the one idea of Mr. Dombey's life. The earth was made for Dombey and Son to trade in, and the sun and moon were made to give them light.' The hopes of Mr Dombey for the future of his shipping firm are centred on his delicate son Paul, and Florence, his devoted daughter, is unloved and neglected. When the firm faces ruin, and Dombey's second marriage ends in disaster, only Florence has the strength and humanity to save her father from desolate solitude. This new edition contains Dickens's prefaces, his working plans, and all the original illustrations by ‘Phiz’. The text is that of the definitive Clarendon edition. It has been supplemented by a wide-ranging Introduction, highlighting Dickens's engagement with his times, and the touching exploration of family relationships which give the novel added depth and relevance.

scholarly journals Solar barycentric dynamics from a new solar-planetary ephemeris

2018 ◽  
Vol 615 ◽  
pp. A153 ◽  
Author(s):  
Rodolfo G. Cionco ◽  
Dmitry A. Pavlov
Keyword(s):  
High Precision ◽  
Orbital Motion ◽  
Giant Planets ◽  
Reference Plane ◽  
The Sun ◽  
The Future ◽  
Dynamical Parameters ◽  
Definition Of ◽  
Invariable Plane ◽  
Planetary Theories

Aims. The barycentric dynamics of the Sun has increasingly been attracting the attention of researchers from several fields, due to the idea that interactions between the Sun’s orbital motion and solar internal functioning could be possible. Existing high-precision ephemerides that have been used for that purpose do not include the effects of trans-Neptunian bodies, which cause a significant offset in the definition of the solar system’s barycentre. In addition, the majority of the dynamical parameters of the solar barycentric orbit are not routinely calculated according to these ephemerides or are not publicly available. Methods. We developed a special version of the IAA RAS lunar–solar–planetary ephemerides, EPM2017H, to cover the whole Holocene and 1 kyr into the future. We studied the basic and derived (e.g., orbital torque) barycentric dynamical quantities of the Sun for that time span. A harmonic analysis (which involves an application of VSOP2013 and TOP2013 planetary theories) was performed on these parameters to obtain a physics-based interpretation of the main periodicities present in the solar barycentric movement. Results. We present a high-precision solar barycentric orbit and derived dynamical parameters (using the solar system’s invariable plane as the reference plane), widely accessible for the whole Holocene and 1 kyr in the future. Several particularities and barycentric phenomena are presented and explained on dynamical bases. A comparison with the Jet Propulsion Laboratory DE431 ephemeris, whose main differences arise from the modelling of trans-Neptunian bodies, shows significant discrepancies in several parameters (i.e., not only limited to angular elements) related to the solar barycentric dynamics. In addition, we identify the main periodicities of the Sun’s barycentric movement and the main giant planets perturbations related to them.

scholarly journals Tidal interactions in rotating multiple stars and their impact on their evolution

2014 ◽  
Vol 9 (S307) ◽  
pp. 208-210
Author(s):  
P. Auclair-Desrotour ◽  
S. Mathis ◽  
C. Le Poncin-Lafitte
Keyword(s):  
Fluid Model ◽  
Orbital Evolution ◽  
Tidal Dissipation ◽  
Tidal Waves ◽  
Physical Mechanisms ◽  
Tidal Interactions ◽  
The Earth ◽  
Half Height ◽  
Multiple Stars ◽  
Stellar Interiors

AbstractTidal dissipation in stars is one of the key physical mechanisms that drive the evolution of binary and multiple stars. As in the Earth oceans, it corresponds to the resonant excitation of their eigenmodes of oscillation and their damping. Therefore, it strongly depends on the internal structure, rotation, and dissipative mechanisms in each component. In this work, we present a local analytical modeling of tidal gravito-inertial waves excited in stellar convective and radiative regions respectively. This model allows us to understand in details the properties of the resonant tidal dissipation as a function of the excitation frequencies, the rotation, the stratification, and the viscous and thermal properties of the studied fluid regions. Then, the frequencies, height, width at half-height, and number of resonances as well as the non-resonant equilibrium tide are derived analytically in asymptotic regimes that are relevant in stellar interiors. Finally, we demonstrate how viscous dissipation of tidal waves leads to a strongly erratic orbital evolution in the case of a coplanar binary system. We characterize such a non-regular dynamics as a function of the height and width of resonances, which have been previously characterized thanks to our local fluid model.

Climate-vegetation-fire interactions and feedbacks: trivial detail or major barrier to projecting the future of the Earth system?

2016 ◽  
Vol 7 (6) ◽  
pp. 910-931 ◽  
Author(s):  
Rebecca M. B. Harris ◽  
Tomas A. Remenyi ◽  
Grant J. Williamson ◽  
Nathaniel L. Bindoff ◽  
David M. J. S. Bowman
Keyword(s):  
Earth System ◽  
Major Barrier ◽  
The Earth ◽  
The Future

Pietro Basso,Modern Times, Ancient Hours: Working Livesin the Twenty-first Century. London: Verso, 2003. pp. 275. $27.00 cloth.

2005 ◽  
Vol 68 ◽  
pp. 134-136
Author(s):  
Gerd-Rainer Horn
Keyword(s):  
Everyday Life ◽  
Working Time ◽  
First Century ◽  
Recent Past ◽  
Social Scientists ◽  
Modern Times ◽  
The Future ◽  
Twenty First Century

For some time now, sociologists, economists and assorted futurologists have flooded the pages of learned journals and the shelves of libraries with analyses of the continuing decline of industrial and other forms of labor. In proportion to the decline of working time, those social scientists proclaim, the forward march of leisure has become an irresistible trend of the most recent past, the present and, most definitely, the future. Those of us living on planet earth have on occasion wondered about the veracity of such claims which, quite often, appear to stand in flat contradiction to our experiences in everyday life. The work of the Italian sociologist Pietro Basso is thus long overdue and proves to be a welcome refutation of this genre of, to paraphrase Basso, obfuscating hallucinations.

scholarly journals Alan Betts: Green Energy Times, 2018

2019 ◽  
Author(s):  
Alan Betts
Keyword(s):  
Climate Change ◽  
Energy Policy ◽  
Climate Science ◽  
Green Energy ◽  
Collective Decision ◽  
The Public ◽  
Systems Perspective ◽  
Climate Change Denial ◽  
The Earth ◽  
The Future

This is a collection of my 2018 articles in the Green Energy Times (http://www.greenenergytimes.org/ ).This series started in 2016. Many of these articles have been edited or updated from articles I wrote forthe Rutland Herald, sometimes with different titles and pictures.They blend science and opinion with a systems perspective, and encourage the reader to explorealternative and hopeful paths for their families and society. They are written so that a scientist willperceive them as accurate (although simplified); while the public can relate their tangible experience ofweather and climate to the much less tangible issues of climate change, energy policy and strategies forliving sustainably with the earth system.The politically motivated attacks on climate science by the current president have sharpened my politicalcommentary this year; since climate change denial may bring immense suffering to our children and lifeon Earth.I believe that earth scientists have a responsibility to communicate clearly and directly to the public1 –aswe all share responsibility for the future of the Earth. We must deepen our collective understanding, sowe can make a collective decision to build a resilient future.

scholarly journals Estuaries, Human Beings, and the Future

2021 ◽  
Vol 9 ◽  
Author(s):  
Steven D. Culberson
Keyword(s):  
Fresh Water ◽  
Human Activities ◽  
Human Beings ◽  
Streams And Rivers ◽  
Salty Water ◽  
The Earth ◽  
The Future

Estuaries are places on the earth where rivers meet oceans. When rain and snowmelt drain off the land, the fresh water collects in streams and rivers and eventually makes its way to the ocean. At the same time, the ocean has tides that push salty water upstream into the rivers. This place, where rivers and oceans mix, is called an estuary. Estuaries contain many kinds of habitats that are home to plants and animals. Many people work and live in estuaries. In this article, I describe what makes estuaries interesting and important to plants, animals, and people. I also explain how these important areas are under threat from certain human activities.

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