Astronomy Picture of the Day . Satellites Collide in Low Earth Orbit . ... Explanation: How often do satellites collide? Although minuscule space debris may strike any satellite on occasion, the first known collision between time two full satellites occurred only last week. ... The collision occurred in low Earth orbit only 750 kilometers up, a height shared by many satellites but significantly higher than the 350-km high human-occupied International Space Station . ... The First Explorer . ...

... 2009 February 18 . Satellites Collide in Low Earth Orbit . ... Explanation: How often do satellites collide? Although minuscule space debris may strike any satellite on occasion, the first known collision between time two full satellites occurred only last week. ... The collision occurred in low Earth orbit only 750 kilometers up, a height shared by many satellites but significantly higher than the 350-km high human-occupied International Space Station . ... About APOD | ...

YAMAL-200 COMMUNICATIONS SATELLITE . Spacecraft Yamal-100, Yamal-200 were developed by the Corporation based on the S.P.Korolev RSC Energia-designed Multi-purpose Satellite Bus under a contract with Gascom within the framework of the Russian Federal SpaceProgram. ... Yamal-200 satellites were launched on November 24, 2003 at 9 hours 22 minutes, Moscow Time. Proton-K launch vehicle put the orbital module into its reference orbit. ... Orbit . ... Official WEB-site of S.P.Korolev RSC Energia . ...

... Low Polar Orbit . ... Different types of satellite orbits have different uses: while the synchronous orbit is best for communication satellites, Lagrangian point orbits help monitor the solar wind before it reaches Earth. ... Many spacecraft use such orbits, e.g. the US Air Force surveillance satellites of the DMSP series, or the series of French Earth-resources spacecraft SPOT . ... If the satellite then starts near a noon-midnight orbit, it will always pass near noon and near midnight. ...

... In an unprecedented space collision, a commercial Iridium communications satellite and a presumably defunct Russian Cosmos satellite ran into each other Tuesday above northern Siberia, creating a cloud of wreckage, officials said today. ... The international space station does not appear to be threatened by the debris, they said, but it's not yet clear whether it poses a risk to any other military or civilian satellites. ... International Year of Astronomy, Ireland National Node . ...

... But there also exists a practical angle: in a world increasingly dependent on electricity and electronics, the "space weather" outside the atmosphere can have serious effects, in particular on human communications. Currently more than 200 communication satellites circle the Earth in synchronous orbit . ... For a view of NOAA's "space weather report," click here ; another such report, from the University of Michigan, is linked here . ... Another such event occured April 7-11, 1997 . ...

. The XMM-Newton website has moved to the following location: . http://www.cosmos.esa.int/web/xmm-newton

... The necessity of simultaneous access to one communication channel by many users, e.g., in satellite communication systems or cellular telephony, has led to the development of the corresponding standards: FDMA (Frequency Division Multiple Access) and TDMA (Frequency Division Multiple Access). ... There is a number of ideas for chaotic signal applications in multiple-access systems, but as a rule, chaotic signals are used there only as efficient and versatile means of quasi-noise signal formation. ...

... Tonight's Sky . ... Observing . ... Sky this Month . ... Sky this Week . ... Astronomy for Kids . ... Communication failure of X-ray astronomy satellite т??Hitomiт?? ... The Japan Aerospace Exploration Agency (JAXA) found that communication with the X-ray astronomy satellite Hitomi (ASTRO-H), launched on February 17, 2016, failed from the start of its operation originally scheduled at 16:40, Saturday March 26 (JST). ... Only registered members of Astronomy.com are allowed to comment on this article....

Optical Communication Experiment using Very Small Optical transmitter with SLR station National Institute of Information and Communications Technology, Japan Space Communications System Laboratory Hiroo Kunimori and VSOTA TEAM Sep 24, 2012 WPLTN Technical Workshop@St.Petersburg, Russia Table of Contents Backgound:HODOYOSHI Project JapaneseHODOYOHI= Reasonable Reliability Engineering to develop series of 50kg Satellite. ... How to share wavelength communication beam and ranging beams. ...

... Although researchers have been studying astronomy and biology for hundreds of years, astrobiology is relatively new to the list of "named" fields of scientific research. ... Astrobiology encourages the new 21st century paradigm under which researchers, educators, and students seek new multi- and interdisciplinary solutions to profound research . The trick is how to achieve close coordination of diverse scientific disciplines and programs. ...

... The tracking system works in micro-step regime with a computer step of correction = 0.003 arcsec per second of time and a maximum speed of correction up to 4.6 arcsec per second of time. ... The APD module was constructed for performing experiments of receiving of 2 Mbps signals from “ARTEMIS” using the Cassegrain focus of 0.7m telescope. ... GaAs PIN photo diode. ... Laser module with thermoelectric stabilisation of laser diode. ... Electronic module for turbulence compensation system . ...

... Gallery . ... US 'Echo' Satellite, 1960 . Sidebar Left . Sidebar Top . No Sidebar . Sidebar Bottom . Sidebar Right . ... Title: US 'Echo' Satellite, 1960 . Description: The US 'Echo 1' satellite was an experimental communications satellite - effectively, it was a giant metallised balloon place into orbit. ... US 'Echo' Satellite, 1960 The US 'Echo 1' satellite was an experimental communications satellite - effectively, it was a giant metallised balloon place into orbit. ...

... Bad Astronomy . ... Bitesize Astronomy . ... Bad Astro Store . ... Site Info . ... It is from from Voyager 1 and shows a whopping big impact crater dominating the profile of the moon. Note that Mimas is about 400 kilometers across (about 250 miles). ... The wall around the crater is 5 kilometers high, and that central peak rises 6 kilometers above the surface (many impact craters have a large central peak which is caused by a pressure rebound from the impact). ... 2008 Phil Plait. ...

. - back to the Virtual Space Museum index. - how to view VRML's, etc... A cool clickable scheme of Mir base module . Mir base module . From Shuttle to Mir . Mir fly-around (VRML) . Mir fly-around (VRML), with Soyuz, Progress and Shuttle . Communication satellite Luch (Altair) . Core module in assembly building . Mir, front view . Right side of Mir . Bottom view . Kristall module . docking mechanism . Luch (Altair) communication satellite . "Space motorcycle" .

... 2000 . ... Сегодня: 10 апреля 2016 г. [Boeing] Корпорация Boeing объявила о завершении процедуры приобретения фирмы Hughes Space Communications, которая до этого была спутниковым подразделением корпорации Hughes и одним из ведущих производителей спутников связи в мире. В результате этой сделки новая компания стала подразделением корпорации Boeing, и называться она будет Boeing Satellite Systems. Ее штаб-квартира будет располагаться в бывшем офисе Hughes Space and Communications. ...

... Because of the difficulties of working with and communicating with a satellite in low-earth orbit, and in order to make HST more efficient, virtually all actions taken by the spacecraft are planned weeks in advance. Only a small fraction of HST's time can be used for real-time actions that are at the discretion of the observer, and even then the only possible action is deciding which object in the field should be centered in the aperture before a subsequent observation is begun. ...

A Brief History of the Discovery of Cosmic Gamma-Ray Bursts - draft april 17, 1995 - J.Bonnell In October of 1963 the US Air Force launched the first in a series of satellites inspired by a recently signed nuclear test ban treaty. ... The event appeared to be a cosmic gamma-ray burst but at the time the constellation of satellites did not have sufficient timing resolution at the trigger to make a good determination of direction to the burst source. ...

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... As a technical demonstration project for the NASA Advanced Communications Technology Satellite (ACTS), we have implemented remote observing on the 10-meter Keck II telescope on Mauna Kea from the Caltech campus in Pasadena. The data connection consists of ATM networks in Hawaii and California, running at OC-1 speeds (45 Mbit/sec), and high data rate (HDR) satellite antennae at JPL in Pasadena and Tripler Army Medical Center in Honolulu. ... These networks were connected via NASA's ACTS satellite. ...