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Astronomers Detect Orbital Motion in Pair of Supermassive Black Holes
Astronomers Orbital Motion Supermassive Black Holes
2017/7/24
Using the supersharp radio “vision” of the National Science Foundation’s Very Long Baseline Array (VLBA), astronomers have made the first detection of orbital motion in a pair of supermassive black ho...
MEASURING COMPLETE GROUND-TRUTH DATA AND ERROR ESTIMATES FOR REAL VIDEO SEQUENCES, FOR PERFORMANCE EVALUATION OF TRACKING, CAMERA POSE AND MOTION ESTIMATION ALGORITHMS
Vision robotics tracking navigation registration
2015/8/14
Fundamental tasks in computer vision include determining the position, orientation and trajectory of a moving camera relative to an
observed object or scene. Many such visual tracking algorithms hav...
Rotational X-ray tracking uncovers hidden motion at the nanoscale
Rotational X-ray tracking hidden motion nanoscale
2014/6/12
Over the past two decades or so, there has been increasing interest and development in measuring slow dynamics in disordered systems at the nanoscale, brought about in part from a demand for advanceme...
On the injection of helicity by shearing motion of fluxes in relation to Flares and CMEs
activity flares magnetic fields Coronal Mass ejections magnetic polarity inversion line
2012/2/24
An investigation of helicity injection by photospheric shear motions is presented for two active regions, NOAA 11158 and 11166, using LOS magnetic field observations obtained from the Helioseismic and...
Constants of motion in stationary axisymmetric gravitational fields
gravitation black hole physics celestial mechanics chaos stellar dynamics
2012/2/24
The motion of a test particle in a stationary axisymmetric gravitational field is generally nonintegrable unless, in addition to the energy and angular momentum about the symmetry axis, an extra nontr...
A Search for High Proper Motion T Dwarfs with Pan-STARRS1 + 2MASS + WISE
Search Proper Motion Dwarfs
2011/10/13
We have searched ~8200 sq. degs for high proper motion (~0.5-2.7"/year) T dwarfs by combining first-epoch data from the Pan-STARRS1 (PS1) 3-Pi Survey, the 2MASS All-Sky Point Source Catalog, and the W...
Investigation of the errors in SDSS proper-motion measurements using samples of quasars
Investigation of the errors in SDSS proper-motion measurements using samples of quasars
2011/10/17
We investigate in detail the probability distribution function (pdf) of the proper-motion measurement errors in the SDSS+USNO-B proper-motion catalog of \citet{mun04} using clean quasar samples. The p...
The Solar Neighborhood XXVII: Discovery of New Proper Motion Stars with mu > 0.18 "/yr in the Southern Sky with 16.5 > R_59F > 18.0
Solar Neighborhood Discovery Proper Motion Stars Southern Sky
2011/10/13
Here we present 1584 new southern proper motion systems with mu > 0.18 "/yr and 16.5 > R_59F > 18.0. This search complements the six previous SuperCOSMOS-RECONS (SCR) proper motion searches of the sou...
Galactic S Stars: Investigations of Color, Motion, and Spectral Features
Galactic S Stars: Investigations Motion Spectral Features
2011/10/12
Known bright S stars, recognized as such by their enhanced s-process abundances and C/O ratio, are typically members of the asymptotic giant branch (AGB) or the red giant branch (RGB). Few modern digi...
Constraining Ceres' interior from its Rotational Motion
rotation – Ceres – Precession-Nutation – l.o.d
2011/9/30
Context. Ceres is the most massive body of the asteroid belt and contains about 25 wt.% (weight percent) of water. Understanding its thermal evolution and assessing its current state are major goals o...
Detectability of Orbital Motion in Stellar Binary and Planetary Microlenses
Orbital Motion Stellar Binary Planetary Microlenses
2011/1/13
A standard binary microlensing event lightcurve allows just two parameters of the lensing system to be measured: the mass ratio of the companion to its host, and the projected separation of the compon...
A law of motion for spherical shells in special relativity
Relativistic fluid dynamics；Relativistic plasmas
2010/11/15
Self-similar solutions to the problem of a special relativistic law of motion for thin shells of matter are calculated. These solutions represent the special relativistic generalization of momentum co...
Effects of Turbulence, Eccentricity Damping, and Migration Rate on the Capture of Planets into Mean Motion Resonance
planetary systems planetary systems formation — planets and satellites formation — turbulence
2010/11/11
Pairs of migrating extrasolar planets often lock into mean motion resonance as they drift inward. This paper studies the convergent migration of giant planets (driven by a circumstellar disk) and dete...
Recurrence plots and chaotic motion around Kerr black hole
black hole physics magnetic fields relativity
2010/11/15
We study the motion of charged test particles around a Kerr black hole immersed in the asymptotically uniform magnetic field, concluding that off-equatorial stable orbits are allowed in this system. B...
The barycentric motion of exoplanet host stars: tests of solar spin-orbit coupling
Earth and Planetary Astrophysics (astro-ph.EP)
2010/12/24
Empirical evidence suggests a tantalising but unproven link between various indicators of solar activity and the barycentric motion of the Sun. The latter is exemplified by transitions between regular...