scholarly journals Pairs of Trans-Neptunian Objects with close orbits

2021 ◽  
Author(s):  
E. D. Kuznetsov ◽  
◽  
O. M. Al-Shiblawi ◽  
V. D. Gusev ◽  
D. S. Ustinov ◽  
...  
Keyword(s):  
Keplerian Orbits

A search for pairs of dynamically correlated trans-Neptunian objects with semi-major axes of more than 30 au was performed. The Kholshevnikov metrics in the space of Keplerian orbits are used. Found 27 pairs with metrics less than 0.07 au1/2, 22 pairs in which one of the components is binary, for metrics less than 0.12 au1/2, and 11 pairs of binary trans-Neptunian objects with metrics less than 0.3 au1/2. It is concluded that the pair 2004 VA131 — 2004 VU131 may be the youngest pair of trans-Neptunian objects known today.

scholarly journals FORCES BETWEEN ELECTRIC CHARGES IN MOTION: RUTHERFORD SCATTERING, CIRCULAR KEPLERIAN ORBITS, ACTION-AT-A-DISTANCE AND NEWTON'S THIRD LAW IN RELATIVISTIC CLASSICAL ELECTRODYNAMICS

2008 ◽  
Vol 23 (02) ◽  
pp. 327-351 ◽  
Author(s):  
J. H. FIELD
Keyword(s):  
Special Relativity ◽  
Small Angle ◽  
Classical Electrodynamics ◽  
Classical Electromagnetism ◽  
Newtonian Gravitation ◽  
Keplerian Orbits ◽  
Rutherford Scattering ◽  
Action At A Distance ◽  
Electrodynamic Theory ◽  
Third Law

Standard formulae of classical electromagnetism for the forces between electric charges in motion derived from retarded potentials are compared with those obtained from a recently developed relativistic classical electrodynamic theory with an instantaneous intercharge force. Problems discussed include small angle Rutherford scattering, Jackson's recent "torque paradox" and circular Keplerian orbits. Results consistent with special relativity are obtained only with an instantaneous interaction. The impossibility of stable circular motion with retarded fields in either classical electromagnetism or Newtonian gravitation is demonstrated.

Bounded relative motions near Keplerian orbits in spherical coordinates

2020 ◽  
Vol 66 (11) ◽  
pp. 2654-2666
Author(s):  
Zhaohui Dang ◽  
Zhengxu Pan ◽  
Hao Zhou ◽  
Hao Zhang
Keyword(s):  
Spherical Coordinates ◽  
Keplerian Orbits ◽  
Relative Motions

scholarly journals Rapid grain growth in post-AGB disc systems from far-infrared and sub-millimetre photometry

2020 ◽  
Vol 494 (2) ◽  
pp. 2925-2936
Author(s):  
P Scicluna ◽  
F Kemper ◽  
A Trejo ◽  
J P Marshall ◽  
S Ertel ◽  
...  
Keyword(s):  
Grain Growth ◽  
Time Scales ◽  
Far Infrared ◽  
Asymptotic Giant Branch ◽  
Growth Time ◽  
Agb Stars ◽  
Keplerian Orbits ◽  
Dust Evolution ◽  
Astronomical Dust ◽  
Protoplanetary Discs

ABSTRACT The time-scales on which astronomical dust grows remain poorly understood, with important consequences for our understanding of processes like circumstellar disc evolution and planet formation. A number of post-asymptotic giant branch (AGB) stars are found to host optically thick, dust- and gas-rich circumstellar discs in Keplerian orbits. These discs exhibit evidence of dust evolution, similar to protoplanetary discs; however, since post-AGB discs have substantially shorter lifetimes than protoplanetary discs, they may provide new insights on the grain-growth process. We examine a sample of post-AGB stars with discs to determine the far-infrared and sub-millimetre spectral index by homogeneously fitting a sample of data from Herschel, the Submillimeter Array (SMA), and the literature. We find that grain growth to at least hundreds of micrometres is ubiquitous in these systems, and that the distribution of spectral indices is more similar to that of protoplanetary discs than debris discs. No correlation is found with the mid-infrared colours of the discs, implying that grain growth occurs independently of the disc structure in post-AGB discs. We infer that grain growth to ∼millimetre sizes must occur on time-scales <<105 yr, perhaps by orders of magnitude, as the lifetimes of these discs are expected to be ≲105 yr and all objects have converged to the same state. This growth time-scale is short compared to the results of models for protoplanetary discs including fragmentation and may provide new constraints on the physics of grain growth.

Relative Motion Between Satellites on Neighbouring Keplerian Orbits

2007 ◽  
Vol 30 (2) ◽  
pp. 521-528 ◽  
Author(s):  
Philip L. Palmer ◽  
Egemen Imre
Keyword(s):  
Relative Motion ◽  
Keplerian Orbits

scholarly journals Solar radiation pressure and deviations from Keplerian orbits

2009 ◽  
Vol 675 (1) ◽  
pp. 18-21 ◽  
Author(s):  
Roman Ya. Kezerashvili ◽  
Justin F. Vázquez-Poritz
Keyword(s):  
Solar Radiation ◽  
Radiation Pressure ◽  
Solar Radiation Pressure ◽  
Keplerian Orbits

scholarly journals Low-Thrust-Enabled Highly-Non-Keplerian Orbits in Support of Future Mars Exploration

2011 ◽  
Vol 34 (5) ◽  
pp. 1396-1411 ◽  
Author(s):  
Malcolm Macdonald ◽  
Robert J. McKay ◽  
Massimiliano Vasile ◽  
Francois Bosquillon de Frescheville ◽  
James Biggs ◽  
...  
Keyword(s):  
Low Thrust ◽  
Mars Exploration ◽  
Keplerian Orbits
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