NATIONAL ASTRONOMY AND IONOSPHERE CENTER . ... Planetary Radar . ... Asteroids . ... Radar imaging of near-Earth asteroids can provide dramatic images with resolutions down to 8 m, comparable to the images obtained by the Galileo and NEAR-Shoemaker spacecraft. ... Asteroid 2001 GQ2 was imaged by the Arecibo radar system during April, 2001 by M. Nolan. ... These radar images of main-belt asteroid 216 Kleopatra were obtained in November, 1999, about one hour apart (Ostro et al 2000, Science). ...

... Status of the numerical solutions and validation 2. ... Coupling of "solid" Earth components, e.g. core ­ mantle (Dehant et al.) ... Consistent relativistic formulation of Earth rotation (Gerlach, Klioner, Soffel) Status of the numerical solutions - 2 · The results from numerical solutions suffer from ­ Simplified solid Earth models ­ Incomplete Earth system models or neglecting of certain parts or neglecting of certain coupling mechanisms ­ Methodological limitations of computations...

... 8, ``Celestial Mechanics'', 2002 High­precision numerical theory of the rigid Earth rotation taking into account the geodetic perturbations G. I. Eroshkin, V. V. Pashkevich Pulkovo Observatory, St. Petersburg, Russia The present investigation is a development of the previous research (Pashke­ vich, 2000). ... As a result, the numerical theory of the rigid Earth rotation is constructed, which is more adequate to the kinematical solution of the semi--analytical theory SMART97 [1]. ...

Astronotes Armagh Planetarium's Stellar Blog! ... Posted on July 8, 2011 | 5 Comments In a dark July night sky you can hardly miss Vega, Altair, and Deneb, the three bright stars of the Summer Triangle ? ... Continue Reading.. ... No Comments St. PatrickтАЩs Academy in Dungannon is a school with both an Astronomy Society and its own observatory! ... No Comments Armagh Planetarium kicked off 2011 in style with some amazing astronomy-based events in association with the€а BBC. ...

... The coordinate axis of this system fixed with respect to the very distant extragalactic radio sources and thus their expected proper motions should be negligibly small. ... Linear motion with constant velocity z = 1, V = 100 km/s µ 0.01 µas/y 1044+719 (defining) z=1.150, scale = 8.286 kpc/" |µ| (43 ± 2) µas/y, VT 1.2c (apparent) Motion of 1044+719 Motion of the defining source 0014+813 2. ... Catalog of sources must contain both their coordinates and apparent motion terms. ...

What's New in Views of the Solar System . ... Mars Icosahedraon Added . ... Rotation Earth Movie . Europa Rotation Movie . ... Color Rotation Tethys Movie . Rotation Tethys Movie . ... Rotating Mars Movie . ... Animation: Io Rotation Movie . ... Rotating Moon Animation . ... Animation of Janus, The Rotating Moon of Saturn . ... Two excellent animations of Mars' moons Phobos and Deimos were added on 9/3/97. ... A high-resolution mosaic image of Phobos , a moon of Mars, was added on 7/8/97. ...

Basis of Spherical Trigonometry.Spherical Triangles.Basic Theorems and Formulas. ... Coordinate Systems in Astronomy. ... Influence of Objects Oun Motion and Their Visible Dementions on Indicated Phenomenons. ... Phenomenons which Have an Influence on Visible Coordinates of Stars. ... Precession and Nutation of Earth's Axis.Celestial Poles Motion and Earth's Rotation Irragularity .Influence of These Phenomenons on Visible Coordinates of Objects.Standard Theories of Precession and Nutation. ...

... See also: . ... This video was created by Scott Manley. ... This video highlights 2 groups of asteroids that have orbits in resonance with Jupiter. To highlight the motion we rotate the view at the same speed as an idealized version of Jupiter, that is, we keep the rotation constant as if the planet was on a circular orbit. ... Asteroids which are in this resonance have their orbital eccentricities increase quickly until their orbits cross those of other planets and they suffer a close encounter. ...

An introduction to the celestial sphere, describing its . apparent rotation and the special role of the pole star. ... This lesson plan supplements the web page listed below. Originally named "The sky above us" , it was split into two parts, each of which now has a lesson plan. ... Celestial sphere, constellation, zodiac, celestial pole, the Pole Star ("Polaris"), celestial equator, rotation of the Earth, planets [theodolite, equatorial axis]. ... What makes the Pole Star special? ...

... No Shift, 180 Degree Rotation . ... HST Overview . Overview . ... All other filters use the values for F606W. This series of tests is designed to test how the IDCTAB deals with a large (180 ) rotation. ... OMEGACEN . ... 0.000000 . ... Vec Mag RMS . Vec Mag Mean . Vec Mag Median . Vec Mag Max . Vec Mag Min . ... NOTE: In the above table, shift values are in units of drizzled image pixels, rotation values are in units of degrees, and scale values are dimensionless multipliers. ...

... The changes are important to us, since they affect our time reckoning, our climate, and our understanding of the Earth's past. ... The Invariable Plane . ... The current location of the celestial north pole, the ecliptic north pole, and the north pole of the invariable plane in the northern sky. ... The north pole of the invariable plane lies in Draco, its south pole in Mensa. ... The precession of the celestial north pole, viewed from above the north pole and against the background of northern...

... Up: Algorithms . ... The imaging problem can be described as an optimizing problem in mathematics. ... Computer simulations of rotating modulation collimator imaging show that the quality of images from this method is better than that from the traditional cross-correlation method. ... The imaging problem is: . ... The results show that this algorithm can be used in the imaging problem and usually results in a better image than that obtained from a traditional method such as cross-correlation. ...

... Tonight's Sky . ... Observing . ... Gravitational wave search provides insights into galaxy evolution and mergers . ... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... Astronomy for Kids . ... Do galaxies rotate clockwise or counterclockwise? Do all galaxies rotate in the same direction? ... Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...

The seminar is supported by the grant of Federal Programm "Integration" . ... Ya.N.Istomin "Magnetodipole oven" . It is shown that the magnetodipole radiation from the rotating magnetized neutron star must penetrate into its conducting crust. ... For the finite conductivity the solution of the electrodynamic equations is the wave propagating from the neutron star surface to the core where the electric field in rotating frame is not equal to zero. ...

... Dr. Ravil Nazirov is the head of the workshop, and Andrew Ananjev is the secretary of the workshop. ... The workshop is used to be held in the last decade of the month, preferably on Tuesdays. ... The next session will take place October 29, 1996 . ... There is "CONPAS" mailing list which you can join to discuss issues of problem solving and to be automatically notified of important dates and decisions with respect to the coming sessions. ... Secretary of the Workshop: Andrew Ananjev . ...

Next: Identification loop Up: Wavelength Calibration Previous: The Echelle Relation . As a consequence of the cross-disperser dispersion relation, a given line repeated in two overlapped regions of the spectrum must be found at the same y position if spectrum and detector are perfectly aligned. ... The above condition provides a geometrical way to estimate the angle, as: , with the difference in y position of the two occurences of the pairs and the difference of their x positions. ...

... Credit: NEAR Project , JHU APL , NASA Explanation: The robot spacecraft NEAR Shoemaker continues to orbit asteroid Eros. This condensed 40-minute long time-lapse sequence taken last month shows what it looks like to pass within 200 kilometers of Eros ' west end. ... This month NEAR-Shoemaker closes to within 100 kilometers, and by the end of this month will orbit only 50 kilometers from the center of this 33-kilometer long asteroid . ... Publications with keywords: 433 Eros - movie - asteroid . ...

... Gaspra . ... Comets . ... Galileo image of Ida asteroid 114k gif ; 41k jpg . ... Large false color image of asteroid 951 Gaspra 172k gif ; 33k jpg . Gaspra in true and false color 18k jpg , 140k gif , 596k tiff . Montage of 11 images taken by Galileo spacecraft of 951 Gaspra 75k gif 75k jpg . ... Gaspra, taken from Galileo, and Phobos and Deimos taken from Viking 96k gif ; 81k jpg . True & Enhanced Color images 140k gif ; 18k jpg ; 596k tiff . ... more NEAR images of Mathilde html . ...

INFLUENC E O F TH E CHEMICA L COMPOSITIO N ON THE CONVECTION, MERIDIONAL CIRCULATION AND DIFFERENTIAL STELLAR ROTATION A. Z. Dolginov, A. V. Klyachkin Ioffe Physical-Technical Institute,194021,Leningrad,Politekhnicheskaya,26,USSR Analitical solutions for the distribution of the temperature , velocities and helium mass concentration in the rotating helium-hydrogen star are obtained. The linear and nonlinear regimes of the convection are considered. ... The numerical estimations are obtained. ...

. Московский государственный университет имени М.В.Ломоносова . Lomonosov Moscow State University . Государственный астрономический институт имени П.К.Штернберга . Sternberg State Astronomical Institute . Отдел небесной механики Celestial Mechanics Department . Кафедра небесной механики, . астрометрии и гравиметрии . Для студентов . О кафедре .