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Topic: Artificial satellites


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In the News (Wed 17 Jul 19)

  
  satellite, artificial - HighBeam Encyclopedia   (Site not responding. Last check: 2007-10-03)
The first artificial satellite, Sputnik I, was launched on Oct. 4, 1957, by the USSR; a test payload of a radio beacon and a thermometer demonstrated the feasibility of orbiting a satellite.
Research satellites measure fundamental properties of outer space, e.g., magnetic fields, the flux of cosmic rays and micrometeorites, and properties of celestial objects that are difficult or impossible to observe from the earth.
Navigation satellites were developed primarily to satisfy the need for a navigation system that nuclear submarines could use to update their inertial navigation system.
www.encyclopedia.com /doc/1E1-satelart.html   (1735 words)

  
 Satellite - Wikipedia, the free encyclopedia
The general criterion for an object to be a satellite is that the center of mass (known as the Barycenter) of the two objects is inside the primary object.
Communications satellites are an artificial satellite stationed in space for the purposes of telecommunications.
The (artificial, though this is not stated in the blazon) satellite appears as a charge in the arms of Arthur Maxwell House.
en.wikipedia.org /wiki/Satellite   (2978 words)

  
 NASA - Artificial Satellites
Artificial satellites also have orbited the moon, the sun, asteroids, and the planets Venus, Mars, and Jupiter.
A satellite remains in orbit because of a balance between the satellite's velocity (speed at which it would travel in a straight line) and the gravitational force between the satellite and Earth.
Scientists use Earth observing satellites to locate mineral deposits, to determine the location and size of freshwater supplies, to identify sources of pollution and study its effects, and to detect the spread of disease in crops and forests.
www.nasa.gov /worldbook/artificial_satellites_worldbook.html   (2394 words)

  
 Satellites
Satellites can't be allowed to jiggle or wander, because if a satellite is not exactly where it belongs, pointed at exactly the right place on the earth, the television program or the telephone call it transmits to you will be interrupted.
The rocket may be fired to accelerate the satellite and move it to a higher orbit or to decelerate it and move it lower.
Meteorological satellites use highly sensitive instruments to obtain cloud-pattern data for use in the computer-generated atmosphere models that are the basis of modern weather forecasting.
html.rincondelvago.com /satellites.html   (2741 words)

  
 Artificial Satellite Tracking - (Part I)
Satellites higher than about 3000 kilometres move very slowly, even when directly overhead, and are not easily picked up at random unless the observer happens to be looking directly at the satellite when it passes close to a star.
Satellites are not normally observable at a phase angle near zero degrees (corresponding to new moon), and depending on the height of the satellite, the phase angle remains in the range 50 to 130 degrees with a mean value of around 90 degrees.
This is due to specular reflection causing brightening when the angle of incidence from the sun to the satellite is equal to the angle of reflection from the satellite to the observer and the sun catches a shiny satellite surface as it spins or tumbles.
www.saao.ac.za /~wgssa/as3/roberts.html   (3580 words)

  
 Artificial Satellite - MSN Encarta
Satellites in polar orbits orbit around Earth at right angles to the equator over both the North and South poles.
A satellite in a Sun-synchronous orbit always passes over a certain point of Earth when the Sun is at the same position in Earth’s sky.
The first artificial satellite to orbit Earth was Sputnik 1.
encarta.msn.com /encyclopedia_761551926_5/Artificial_Satellite.html   (607 words)

  
 Number of Artificial Satellites
Artificial satellites usually are built to perform their function.
Artificial satellites remain in orbit because of the precision of the satellites velocity in reference to the gravitational force between it and the earth.
The artificial satellites were first manufactured by the Soviets in a project called Sputnik 1 in 1957.
hypertextbook.com /facts/2004/VadimBlikshteyn.shtml   (335 words)

  
 Artificial Satellites at CalSKY
Satellites, which apparently stand still in the sky, are called geostationary satellites.
The speciality of this satellites are the three radio transmitting antennas, which are as plain and reflective as mirrors (the smaller planes in the lower part of the satellite body in figure 3).
Several thausands of satellites and pieces of debris are at your disposition, and wait to be drawn with its apparent tracks in a star chart.
www.calsky.com /cs.cgi/Satellites   (2039 words)

  
 Satellites
Communication satellites are artificial satellites that provide a worldwide linkup of radio and television transmissions and telephone service; such satellites avoid the limitations that were previously experienced by ground based facilities due to the curvature of the earth.
These are other types of satellites that are designed specially to aid navigation at sea, in the air, and on land, for example a navigator can locate the exact position of his ship and calculate his way he has to go.
Weather satellites (or artificial satellites) are used for the gathering of data on a global basis for improvement of weather forecasting.
library.thinkquest.org /26890/satellitest.htm   (590 words)

  
 Artificial satellite communication system - Patent 5871181
The system according to claim 8, wherein the artificial satellites are inclined with respect to the Equator such as to exploit the natural spacing of approximately 120.degree.
The Equator-crossing Right Ascensions of the satellites and their timing would be spaced so as to ensure an identical sub-satellite track for all satellites, and would be fixed in such a way as to be optimal for the desired stay over the desired area.
Satellite orbits could also be used having a period of two-thirds of a sidereal day, that is slightly less than 16 hours.
www.freepatentsonline.com /5871181.html   (3249 words)

  
 Satellites
Satellites are objects in orbit around Earth, other planets, or the Sun.
Artificial satellites are man-made and are very important to Earth.
The satellite has a camera (like a resource satellite) that takes pictures of places on Earth to figure out where rain, snow, sleet and hail are falling.
library.thinkquest.org /J0112188/satellites.htm   (602 words)

  
 Howstuffworks "How Satellites Work"
Although anything that is in orbit around Earth is technically a satellite, the term "satellite" is typically used to describe a useful object placed in orbit purposely to perform some specific mission or task.
The Soviet Sputnik satellite was the first to orbit Earth, launched on October 4, 1957.
If a satellite were launched at the wrong time of the day in perfect weather, the satellite could end up in an orbit that would not pass over any of its intended users.
www.howstuffworks.com /satellite.htm/printable   (4169 words)

  
 Famous Satellites
Some of these satellites are still hard at work, and some of these have significantly changed our outlooks pertaining to the earth, and space.
He used the excuse that the satellite was used to test radioactivity in space.
Satellites also help us learn about our environment, and how we should modify our ways to save our earth.
www.smgaels.org /physics/97/APUCA2~1.HTM   (494 words)

  
 Artificial Satellites   (Site not responding. Last check: 2007-10-03)
Artificial, Earth orbiting satellites are visible on pretty much any clear night.
The easiest satellite to observe is the International Space Station since it is one of the brightest objects in the sky.
Include in your report the name of the satellite, the predicted magnitude, times, directions and maximum elevation of passage and your estimated actual times, directions, and maximum elevations of passage.
physics.weber.edu /johnston/astro/observations/satellites.htm   (172 words)

  
 artificial satellite — Infoplease.com
The satellite is lifted from the earth's surface by a
Sputnik I, was launched on Oct. 4, 1957, by the USSR; a test payload of a radio beacon and a thermometer demonstrated the feasibility of orbiting a satellite.
artificial satellite: Tracking and Telemetry - Tracking and Telemetry Since more than 1,000 satellites are presently in orbit, identifying and...
www.infoplease.com /ce6/sci/A0843738.html   (330 words)

  
 Artificial Satellite Questions
Modem satellites receive the signals and they re transmit them to their destinations.
A series of 18 satellites around the Earth are used by special receivers on ships and planes to tell them EXACTLY where they are to the nearest 10m.
Satellites which orbit 22,238 miles (35,788 km) above the Earth's EQUATOR are said to be in GEOSTATIONARY orbit.
www.telescope.org /nuffield/pas/earth/earth9.html   (614 words)

  
 IMAGERS - Remote Sensing Lesson 2
A simple definition of a satellite is a free-flying object that orbits the Earth, another planet, or the sun.
Artificial satellites are man-made, such as weather satellites.
Ask students to work as a group and describe what their satellite could be used for.
imagers.gsfc.nasa.gov /teachersite/RS2.html   (285 words)

  
 artificial satellite: Types of Satellites
the first such satellite, was launched in 1960; it transmitted infrared television pictures of the earth's cloud cover and was able to detect the development of hurricanes and to chart their paths.
Defining international satellite communications as weapons of mass destruction: the first step in a compromise between national sovereignty......
CORONA satellite photography: an archaeological application from the Middle East.
www.infoplease.com /ce6/sci/A0860930.html   (1018 words)

  
 Tracking Space Junk   (Site not responding. Last check: 2007-10-03)
Although you are in the sun's shadow, the satellite is still in sunlight, and the reflected sunlight illuminates it for us watchers on Earth.
With the advent of microcomputers, tracking programs were written to automatically track specific satellites of interest, thus leaving the operator with more time to communicate.
Either way, information is available for all satellites of interest to educators, including weather satellites, amateur satellites, and objects of high visibility such as the Mir space station.
octopus.gma.org /surfing/satellites/spacejunk.html   (495 words)

  
 Visual Satellite Observer's Home Page   (Site not responding. Last check: 2007-10-03)
These are Earth-orbiting satellites, visible due to the reflection of the Sun's light off their surfaces toward the observer.
Hundreds of satellites are visible to the unaided eye; thousands are visible using binoculars and telescopes.
the NEAR satellite Sun glint manoeuvre that was scheduled for Jan 23, 1998 for the US the Optical Calibration Sphere Experiment (OCSE) satellite decayed on March 5, 2001.
www.satobs.org /satintro.html   (388 words)

  
 JavaScout's Galactic Civilizations Database - Artificial Satellites
Artificial Satellites will increase our prestige and influence.
While satellites are nothing new to us, having an artificial moon is. These gigantic space stations are capable of housing millions of people if necessary.
Believe it or not, the power necessary to maintain its artificial gravity would be sufficient to shut down the fusion reaction inside of a star.
webpages.charter.net /trevorpowdrell/60.htm   (103 words)

  
 The Number of Artificial Satellites in Orbit
There have been about 4000 launches (some with multiple payloads) and my guess is that several hundred of the satellites involved are still active.
Nine individual countries have launched satellites (USA, Russia, Japan, China, France, India, Israel, Australia, UK) as well as international consortia (ESA, the European Space Agency, being the most important of those).
A large number of countries have enough money and could easily acquire the technology to launch satellites, but choose for economy and convenience to either have another country launch their payloads or to participate in the space projects of other nations.
imagine.gsfc.nasa.gov /docs/ask_astro/answers/980202e.html   (248 words)

  
 Satellites
Artificial Satellites: (topic last updated February 24, 2001)
Heavens-Above: Originally begun by the DLR German Space Operations Center (GSOC), the aim of Heavens-Above GmbH is to provide all the information necessary to observe satellites, the International Space Station, the Space Shuttle, and the dazzlingly bright flares from Iridium satellites.
Visual Satellite Observer's Home Page: This site provides an introduction to satellite observing, information on satellites to watch, and related news reports.
www.marsastro.org /html/satellites.htm   (138 words)

  
 sci.astro.satellites.visual-observe   (Site not responding. Last check: 2007-10-03)
For your newsgroups file: sci.astro.satellites.visual-observe Visually observing artificial satellite.
The charter, culled from the vote result announcement: Sci.astro.satellites.visual-observe is an unmoderated forum for discussion and exchange of information about visual observing of artificial satellites.
Articles containing discussions of radio observations are not welcome, unless they are tied in with visual observations.
www.satobs.org /usenet.html   (265 words)

  
 Satellite Home   (Site not responding. Last check: 2007-10-03)
Well if you think that's interesting, Check out these topics...
So, what do satellites have to do with you?
Well, without satellites we would not be able to know about the weather, we would not be able to communicate accross the globe, we would not be able to use beepers and cell phones where ever we are.
www.smgaels.org /physics/97/home.htm   (78 words)

  
 Welcome to Heavens-Above!
Click here to select your location and obtain predictions.
Our aim is to provide you with all the information you need to observe satellites such as the International Space Station and the Space Shuttle, spectacular events such as the dazzlingly bright flares from Iridium satellites as well as a wealth of other spaceflight and astronomical information.
We not only provide the times of visibility, but also detailed star charts showing the satellite's track through the heavens.
www.heavens-above.com   (217 words)

  
 SkyTonight.com - Satellites
Journey along the ancient Silk Road aboard the Orient Express
These communications satellites can briefly outshine Venus as they spray the ground with reflected sunlight.
Making the photograph visually interesting, however, is more challenging.
skyandtelescope.com /observing/objects/satellites   (48 words)

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