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Topic: Asteroid

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In the News (Sat 20 Apr 19)

  Asteroid Introduction
Sixteen asteroids have a diameter of 240 km or greater.
Asteroids that are on a collision course with Earth are called meteoroids.
Then on October 1991 asteroid 951 Gaspra was visited by the Galileo spacecraft and became the first asteroid to have hi-resolution images taken of it.
www.solarviews.com /eng/asteroid.htm   (543 words)

  Asteroid - Wikipedia, the free encyclopedia
Asteroids are commonly classified into groups based on the characteristics of their orbits and on the details of the spectrum of sunlight they reflect.
Stories of asteroid mining became more and more numerous since the late 1940s, with the next logical step being depictions of a society on terraformed asteroids —in some cases dug under the surface, in others having dome colonies and in still others provided with an atmosphere which is kept in place by an artificial gravity.
Moreover, depictions of the Asteroid Belt as The New Frontier clearly draw (sometimes explicitly) on the considerable literature of the Nineteenth-Century Frontier and the Wild West.
en.wikipedia.org /wiki/Asteroid   (3553 words)

 Asteroid - MSN Encarta
Asteroid, one of the many small or minor rocky planetoids that are members of the solar system and that move in elliptical orbits primarily between the orbits of Mars and Jupiter.
Asteroids that intersect the orbit of Mars are called Amors; asteroids that intersect the orbit of Earth are known as Apollos; and asteroids that have orbits smaller than Earth’s orbit are called Atens.
Three-quarters of the asteroids visible from Earth, including 1 Ceres, belong to the C type, which appear to be related to a class of stony meteorites known as carbonaceous chondrites.
ca.encarta.msn.com /encyclopedia_761551567/Asteroid.html   (1729 words)

 NASA - Asteroid
It is one of thousands of asteroids in the asteroid belt, a region between the orbits of Mars and Jupiter.
The average temperature of the surface of a typical asteroid is -100 degrees F (-73 degrees C).
Asteroids in the second group, which are located in the inner part of the belt, are rich in minerals.
www.nasa.gov /worldbook/asteroid_worldbook.html   (945 words)

It is believed the main asteroid belt failed to form a planet because giant jupiter disrupts their orbits and prevents them from coalescing.
In 1937 asteroid Hermes was discovered, passing less than a million kilometers from earth proving we are always in some danger from these interlopers.
Asteroid gaspra from the Galileo spacecraft which passed it on route to Jupiter.
freeware.intrastar.net /solarsystem/asteroid.htm   (422 words)

 Asteroids, Asteroid, Asteroid Belt at SPACE.com
These minor planets, or asteroids, are the products of the protoplanetary disc — dense rings of gas surrounding a newly formed star.
The possible impact of asteroids and comets with the Earth’s surface could be catastrophic.
We are also able to learn about asteroid impact from the effects they have had on other planets and their satellites.
www.space.com /asteroids   (423 words)

Asteroids are classified into a number of types according to their spectra (and hence their chemical composition) and albedo:
Between the main concentrations of asteroids in the Main Belt are relatively empty regions known as the Kirkwood gaps.
It is a particularly interesting asteroid in that it seems to have been differentiated into layers like the terrestrial planets.
www.nineplanets.org /asteroids.html   (1366 words)

 Asteroids: Zoom Astronomy
Asteroids are rocky or metallic objects, most of which orbit the Sun in the asteroid belt between Mars and Jupiter.
The asteroid belt is a doughnut-shaped concentration of asteroids orbiting the Sun between the orbits of Mars and Jupiter, closer to the orbit of Mars.
Trojan asteroids are asteroids that orbit in gravitationally stable Lagrange points in a planet's orbit, either trailing it or preceding it (these places are where the gravitational attraction of the Sun and of the planet balance each other).
www.enchantedlearning.com /subjects/astronomy/asteroids   (771 words)

 Asteroid 4179 Toutatis
Asteroid 4179 Toutatis (formerly 1989 AC) was discovered by C. Pollas on January 4, 1989, at Caussols, France, on photographic plates taken on the 0.9-m Schmidt telescope by Alain Maury and Derral Mulholland during astrometric observations of Jupiter's faint satellites.
The inversion solved for the asteroid's shape and inertia tensor, their orientation with respect to each other, initial conditions for the asteroid's spin and orientation, the radar scattering properties of the surface, and the projected location of the asteroid's center of mass in each frame.
The asteroid's 1996 approach was not as close as in 1992, and Arecibo was unavailable (that telescope was being upgraded), but Goldstone was used for high-resolution imaging on nine straight dates.
echo.jpl.nasa.gov /asteroids/4179_Toutatis/toutatis.html   (2595 words)

 asteroid on Encyclopedia.com   (Site not responding. Last check: )
The near-earth asteroids, which closely approach the earth, are classed as Atens (with orbits between the earth and the sun), Apollos (with orbits similar to that of the earth), and Amors (with orbits between the earth and Mars).
Asteroids are also classified by composition and albedo, most being one of three types.
Asteroids have been implicated in several mass extinctions of large numbers of animal and plant species in the past.
encyclopedia.infonautics.com /html/a1/asteroid.asp   (1189 words)

 CNN.com - Scientists warn of asteroid threat - July 25, 2002
The asteroid, dubbed 2002 NT7, is travelling at 28 kilometres per second and there is a chance, initial calculations indicate, that it could hit our planet on February 1, 2019.
Astronomers believe the asteroid, discovered through the Linear Observatory's automated sky survey programme in New Mexico in the U.S. on July 5, could be the most threatening object yet detected in space.
It is the first object to be given a positive value, of 0.06, on the Palermo scale of potential threat posed by asteroids, although scientists said further calculations were needed to pin the precise path of 2002 NT7.
archives.cnn.com /2002/TECH/space/07/24/asteroid.nt7   (358 words)

 New Scientist Breaking News - Hayabusa probe prepares to punch an asteroid   (Site not responding. Last check: )
Japan's Hayabusa spacecraft is set to perform the first of three daring rendezvous with a small asteroid on Friday, as planetary scientists puzzle over close-up images of the space rock.
While most asteroids appear to be covered largely by regolith — powdery material created when small meteorites crash into a rocky body — Itokawa's surface shows only small amounts of the pulverised stuff.
This, along with Hayabusa's discovery that the asteroid's density is less than expected, leads Bottke to believe it may be composed of smaller rocks that are held together by gravity.
www.newscientist.com /article.ns?id=dn8259   (822 words)

 Trojan Asteroid Point @ LaunchBase.net (Launch Base)   (Site not responding. Last check: )
Also shown is the main asteroid belt between the orbits of Mars and Jupiter.
Barnard is now believed to have made the first observation of a Trojan asteroid, in 1904, but the significance of his observation was not noted at the time.
As the Iliad deals with the events of the Trojan War, the asteroids came to be collectively known as Trojan asteroids.
www.launchbase.net /encyclopedia/Trojan_asteroid   (611 words)

 Asteroid Fact Sheet
The image above is a false color view of the asteroid 951 Gaspra taken by the Galileo spacecraft.
Below is a table of information on selected asteroids, and at the bottom of the page are comments on the asteroids.
433 Eros - Near-Earth asteroid being studied from orbit by the NEAR mission, which flew by Eros in February 1999 and went into orbit in February 2000.
nssdc.gsfc.nasa.gov /planetary/factsheet/asteroidfact.html   (565 words)

 18610 Arthurdent - Wikipedia, the free encyclopedia
It has been claimed that there is a strange coincidence associated with this asteroid: its name was supposedly announced the day before Douglas Adams died (11 May 2001).
Alan Boyle states (on August 26, 2003) that the MPC was published on May 8, 2001 [1].
Felix Hormuth, who discovered the asteroid, was told that the name had been approved (and would shortly be published) on May 9, 2001 [2], which seems to rule out the earlier date.
en.wikipedia.org /wiki/18610_Arthurdent   (317 words)

 StarChild: The Asteroid Belt
So far, the largest asteroid found in the asteroid belt is as big as the state of Texas.
Most of the asteroids in our solar system can be found orbiting the Sun between the orbits of Mars and Jupiter.
If an asteroid is captured by the gravitational pull of a planet, the asteroid can be pulled out of the belt and go into orbit as a moon around the planet that pulled on it.
starchild.gsfc.nasa.gov /docs/StarChild/solar_system_level1/asteroids.html   (262 words)

 Could an asteroid or comet hit earth? - A New Age / Bible Prophecy Discussion
The scientific answer is that it is possible that an asteroid or comet could belt earth, this explosive impact with our world causing global destruction, a nuclear worldwide firestorm, and later cutting off the sunlight similar to a nuclear winter, but the odds are so small that it is not worth worrying about.
This asteroid has an orbital period around the sun of 837 days and 1.2 miles wide, giving it enough kinetic energy to be a doomsday asteroid.
For example, the asteroid that destroyed the dinosaurs millions of years ago is believed to have hit in the Yucatan of Mexico.
www.revelation13.net /asteroid.html   (4640 words)

 Phil Plait's Bad Astronomy: Bad TV
Asteroids do exist, and an impact by a large one would be a bad thing.
Good: Even in the thickest part of the asteroid belt, asteroids are few and far between, with an average distance of millions of miles between rocks of any appreciable size.
Comets, unlike asteroids, do not move on easily predictable paths because gas can be emitted in jets from the core, pushing the comet in random directions.
www.badastronomy.com /bad/tv/asteroid.html   (2970 words)

 Asteroids may have created ancient craters - Space.com - MSNBC.com
A pair of 35-million-year-old craters on Earth thought to have been carved by comets now appears to be the result of a broken asteroid that generated a slowly delivered shower of debris over millions of years.
Other studies have found that when asteroids collide and break apart, their fragments can move from the asteroid belt between Mars and Jupiter to reach Earth's vicinity over long time periods.
The asteroid that broke up to produce the asteroid shower "was much bigger" and "should have produced many more fragments than the two that came on an Earth collision course," Claeys said.
www.msnbc.msn.com /id/5519735   (634 words)

 Asteroid named after ‘Hitchhiker’ humorist - Space News - MSNBC.com
Asteroid Douglasadams was among the 71 newly named celestial objects announced Tuesday by the International Astronomical Union's Minor Planet Center in Cambridge, Mass.
But Adams' asteroid should hold special appeal for fans of science fiction and pop culture: His "Hitchhiker" saga, which traces the adventures of a motley interplanetary crew after Earth is destroyed to make way for a hyperspace bypass, started out as a BBC radio comedy.
For example, the "Arthurdent" asteroid was so named at the suggestion of the man who actually found it, German astronomer Felix Hormuth.
www.msnbc.msn.com /id/6867061   (964 words)

 USATODAY.com - Asteroid-eating robots considered for Earth's protection   (Site not responding. Last check: )
Their weapon: a swarm of nuclear-powered robots that could drill into an asteroid and hurl chunks of it into space with enough force to gradually push it into a non-Earth impacting course.
At the heart of the MADMEN concept is a mass driver, which would eject asteroid material as it is drilled out of the rock and sling it out into space using electromagnetic acceleration.
The key, they said, is to have a lander on each face of an asteroid working together autonomously to push the space rock in one direction as it tumbles through space.
www.usatoday.com /tech/news/2004-05-19-asteroid-eaters_x.htm   (1022 words)

 Asteroid occultation predictions
I've ceased posting asteroid occultation predictions of my own; it's a tough thing to keep up with, and several people are doing a better job of it than I probably would anyway.
The asteroid is usually a small fraction of an arcsecond in diameter, which means that if your position for the star or the asteroid is off by that amount, your prediction will be off by an entire path width.
Unless clicking on an entry in the "asteroid occultation table" has already done it for you, you should set up Guide for the approximate date/time of the event, and "go to" either the asteroid or the star that is going to be occulted.
www.projectpluto.com /ast_occu.htm   (1579 words)

 Technorati Tag: asteroid
The asteroid Apophis, in Egyptian myth an ancient spirit of evil and destruction who dwelt in eternal darkness, was calculated to have a 1 in 5500...
Scientists didn’t think it was possible to find pieces of large asteroids that have struck the Earth’s surface.
The newly discovered asteroid 2006-HZ51 has only a one in six million chance of hitting the Earth but because of it’s late detection, scientists say...
www.technorati.com /tag/asteroid   (503 words)

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