... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... Risks Comparable to NEOs . ... The Increasing Rate of Discovery of Asteroids . ... Comet and Asteroid Collision Probabilities . ... Extreme albedo comets and the impact hazard (PDF Format) . ... Asteroid Impact Animations . ... Workshop on Scientific Requirements for Mitigation of Hazardous Comets and Asteroids - 2002 . ... The Spaceguard Survey Report, 1992 (PDF) . Tsunami from Asteroid/Comet Impacts . ...

Russian SHAREABLE DATA CENTER Institute of Solar-Terrestial Physics SB RAS . ... Chirp ionosonde main technical characteristics . ... Linear frequency modulated continuous signals sounding method is relatively simple and has wide application in various special-purpose systems. ... Chirp signals which are applying for ionosphere channel diagnostics usually have10KHz/s -- 1MHz/s. We must point out that under modulation speed increasing there is an increase in noise suppression and resolution power. ...

... Arecibo Observatory took radar images of asteroid 1998 QE2 and its moon as the space rock sailed safely past earth. ... Both the asteroid and its moon passed 6 million kilometers (3.8 million miles) from earth. ... Radar images of asteroid 1998 QE2 (bottom) and its satellite (top) on June 6. ... Radar images of asteroid 1998 QE2 (center) and its satellite (bottom left) on June 7. ... Radar image from June 7 showing the satellite moving past the primary. ...

... HST Phase II Proposal Instructions for Cycle 20 > Chapter 4: Solar System Targets > 4.5 Ephemeris Center [Ephem_Center] . ... HST?s on-board software then computes a correction for the parallax induced by the telescope?s orbit. ... However, HST?s on-board parallax correction may be insufficient for a target closer than 3.8 million kilometers. ... An HST-centric target ephemeris is generated. ... An HST-centric ephemeris should be specified only for very close targets such as the Moon. ...

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... Planets . ... Earth Satellites . ... The newly discovered ?mega-Earth? ... Its sibling, the lava world Kepler-10b, is in the background (the two planets? proximity is grossly exaggerated) .€а Kepler-10c has a diameter of about 29 000 km, 2.3 times as large as Earth, and weighs 17 times as much. ... The first mega-earth to be discovered is Kepler-10c which orbits a star lying about 560 light years from the Sun in the constellation Draco. ... Astronomers Find a New Type of Planet: The ?Mega-Earth? ...

Astronomy Picture of the Day . ... Alpha Centauri: The Closest Star System . ... The closest star system to the Sun is the Alpha Centauri system. ... The bright stars Alpha Centauri.. The Shuttle Launches an Inflatable Antenna . ... In the Center of 30 Doradus . ... In the center of 30 Doradus lies a huge cluster of the largest, hottest, most massive stars known. ... The largest, most violent star forming region known in the whole Local Group of galaxies lies in our neighboring galaxy the LMC. ...

... JSC Oral History . NASA History . ... NASA Oral History Project: Earth System Science at 20 . This NASA Oral History Project features recollections from those who significantly contributed to the launch and evolution of Earth System Science. These interviews were gathered as part of the 20th anniversary of the Earth System Science Program. ... NASA Headquarters, Washington D.C. Program Manager , Stratospheric Theory and Data Analysis, Earth Science and Applications Division . ...

... 8, ``Celestial Mechanics'', 2002 High orbit for the RadioAstron project N. S. Kardashev, B. B. Kreisman, Yu. N. Ponomarev Astro Space Center of the Lebedev Physical Institute, Moscow, Russia RadioAstron project is an international collaborative mission to launch a free flying satellite carrying a 10­meter radio telescope in elliptic orbit around the Earth [1,2]. ... For RadioAstron mission it is proposed to use one K­band circular polarized chan­ nel at fixed frequency 22.232 GHz. ...

An astronaut in low Earth orbit moves in (approximately) a big circle extending around the Earth. ... That can be interpreted as stating that in the astronaut's frame of reference, all bodies are subject to two forces, gravity and the centrifugal force, and the two are in perfect balance, adding up to zero. ... Wheel-shaped space . ... The science-fiction film "2001: A Space Odyssey" featured spinning space station, whose rotation provided the crew with "artificial gravity." ...

... Pre-university education . ... Samara region . ... A small spacecraft Aist-2D , developed by the scientists of Samara State Aerospace University (SSAU) and the experts of the Rocket and Space Centre Progress will see from outer space what is hidden under the thick top of trees and below the Earth's surface. The radar equipment was installed on Aist-2D , which was delivered to the space launcher complex Vostochniy on January 22. ... Tomography of the Earth's ionosphere will also be carried out. ...

... PUL VLBI Analysis Center . ... Pulkovo EOP and Reference Systems Analysis Center (PERSAC) is located at the Pulkovo Observatory . ... Processing of VLBI , GPS, and optical observations aimed at analysis of the Earth rotation, station displacement, and celestial reference system. ... Celestial Pole Offset (CPO) and Free Core Nutation (FCN) . Four daily updated CPO and FCN series (models) are provided. ... File fcn1.dat contains the ZM1 FCN model with variable amplitude and phase. ...

... Ranger 7 was designed to achieve a lunar impact trajectory and to transmit high-resolution photographs of the lunar surface during the final minutes of flight. ... Velocity at impact was 2.62 km/sec (1.62 miles per second). ... The television system consisted of a six slow-scan vidicon TV cameras capable of transmitting high-resolution, close-up television pictures of the lunar surface during the final minutes of flight before the spacecraft impacted the lunar surface. ...

... Resolution - 1.5-2.0 km . Swath - 450 km . ... Swath - 550 km . ... Resolution - 370 km . ... Spectral bands - 0.6-0.7 um; 0.8-1.1 um . ... Kondor - system for collection and transmission of data from sea and ice stations . ... Downlinking to ground stations (main centers) . ... Satellite's information system operates in both direct transmission mode and recording to on-board recorder mode with later downlink to ground station. ... For more information send a mail to: info@sputnik.infospace.ru . ...

Map projected image of Earth (AVHRR) 123k gif . Famous Apollo 11 image of Africa & Europe 31k jpg . global composite of satellite images 508k gif . ... Earth by Meteosat 4 satellite (IR filter) 688k jpg . ... infrared weather satellite image of the US and Mexico gif . ... NOAA satellite's view of USA 322k gif . ... USA at night 67k gif ; html . ... Earth-Moon together from Galileo 2nd flyby P-41508 79K gif . ... Earth images from weather satellites html . ... Earth Viewer html . ... Earth .. ...

... Tonight's Sky . ... SUN MOON MERCURY VENUS MARS, JUPITER SATURN . ... Moon . ... Supernova showered Earth with radioactive debris . ... Asteroid to safely pass close to Earth on Sunday . At the time of closest approach, the 60-foot (20m) object will be about one-tenth the distance from Earth to the Moon. ... A small asteroid, designated 2014 RC, will safely pass close to Earth on Sunday, September 7, 2014. ... Only registered members of Astronomy.com are allowed to comment on this article. ...

... Interdisciplinary seminar "Satellite methods and systems for Earth research" (chairman - corresponding member of Russian Academy of Sciences G.M.Chernyavsky) . ... SMIS Information System for Acquisition, Processing, Storage and Distribution of Satellite Data . ... Provides operational access to satellite data and derived products. ... Provides automatic collection, processing and cataloging of satellite data and remote access to information. ... Provides remote access to information. ...

... Astronomy news . ... Earth Seen By NASA's Moon Mapper On India's Chandrayaan-1 Spacecraft . A new image of Earth taken from 200 kilometers (124 miles) above the lunar surface was taken by the Moon Mineralogy Mapper, one of two NASA instruments onboard the Indian Space Research Organization's Chandrayaan-1 spacecraft. ... NASA's Jet Propulsion Laboratory, Pasadena, Calif., designed and built the Moon Mineralogy Mapper and is home to its project manager, Mary White. ...

... Our restless globe and its companion. ... A Look at the Motions of the Earth in Space and How They Are Changing . ... Earth's rotation as viewed from above the north and south geographic poles. ... The Earth revolves around the Sun-also counterclockwise viewed from above the North Pole, clockwise viewed from the South Pole-to give us our years (see Figure 2 ). The plane of the Earth's orbit is called the ecliptic (where eclipses happen). ... Earth's orbit as viewed from the north ecliptic pole. ...