Close encounters #2: Asteroiden scheren langs de aarde

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Op zondag 24 februari 2013 13:19 schreef downgrade het volgende:
The recent crash-down in Russia was a fleabite. The one in 2036 could destroy entire nations

http://enenews.com/newswe(...)-prepare-worst-video

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The most dangerous one is called Apophis, which is 1,000 feet across and will come dangerously close to Earth in 2029 and again in 2036. The most recent calculations show that Apophis will barely miss Earth in 2029, but will actually graze our atmosphere.

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Op zondag 24 februari 2013 13:19 schreef downgrade het volgende:
The recent crash-down in Russia was a fleabite. The one in 2036 could destroy entire nations

http://enenews.com/newswe(...)-prepare-worst-video

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Op zaterdag 23 februari 2013 18:18 schreef SpeedyGJ het volgende:

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Ah facebook direct linken lukt dus niet
Nu wel?

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Op zondag 24 februari 2013 14:05 schreef Frutsel het volgende:

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Apophis wordt wel een bijzonder spektakel denk ik.. ding is vele malen groter dan die van 15 februari en de afstand dat hij langs de aarde komt zal hooguit een paar 1000km meer zijn. Is vast met het blote oog te zien ?

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Earth dodges another bullet
A newly found asteroid will pass just inside the orbit of the Moon, with its closest approach on March 4, 2013 at 07:35 UTC. Named 2013 EC, the asteroid is about the size of the space rock that exploded over Russia two and a half weeks ago, somewhere between 10-17 meters wide. The asteroid that sparked the Russian meteor is estimated to have been about 17 meters wide when it entered Earth’s atmosphere.

2013 EC was discovered by the Mt. Lemmon Observatory in Arizona on March 2. There is no chance this asteroid will hit Earth.

2013 EC will come within 396,000 kilometers from Earth, (246,000 miles, or around 1.0 lunar distances, 0.0026 AU.

The Moon’s distance from the Earth varies between 363,104 km (225,622 miles) at perigee (closest) and 406,696 km (252,088 miles) at apogee (most distant point).

Gianluca Masi from the Virtual Telescope Project had a live view of the asteroid when it was about twice the distance of the Moon, and a replay of that webcast is available below. (Views of the asteroid start at about 31:00 in the video.)

“That we are finding all these asteroids recently does not mean that we are being visited by more asteroids,” Masi said during the webcast, “just that our ability to detect them has gotten so much better. Our technology has improved a lot over the past decades.”

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Op maandag 4 maart 2013 22:16 schreef Frutsel het volgende:

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Toch weer een nearmiss van een asteroide die slechts 2 dagen geleden ontdekt is

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Op zaterdag 9 maart 2013 17:04 schreef downgrade het volgende:
PAN-STARSS

http://www.demorgen.be/dm(...)te-oog-te-zien.dhtml

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Op zondag 10 maart 2013 21:03 schreef -CRASH- het volgende:

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W&T / Nieuwe komeet ISON kan helderste in decennia worden?

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Asteroid ‘size of city block’ skims past Earth on Saturday

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Op zondag 10 maart 2013 21:25 schreef downgrade het volgende:

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Op zaterdag 23 maart 2013 20:38 schreef Frutsel het volgende:

Fire in the Sky : Green Meteor lights up the East Coast from Virginia to Boston (Mar 22, 2013)

Stunning video: Fire ball explodes, lights up Spanish skies

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A brilliant ball of flame streaked across the sky above the Spanish capital Madrid, dazzling stargazers and astronomers alike. The celestial display was so bright it could be seen across the entire country.

The eye-popping moment was caught on camera by the Hita Observatory at the University of Huelva at around 11:45pm local time (2145 GMT). The object struck the atmosphere above the Villamuelas district in the province of Toledo, southwest of Madrid.

“The impact was so abrupt that the object immediately caught fire, creating a ball of flame around 100 kilometers above the Earth,” Jose Maria Madiedo of the University of Huelva told the Huffington Post. The meteor then shot towards Madrid at over 75,000 kilometers an hour before disintegrating completely at an altitude of 70 kilometers.

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'Tunguska meteoriet is gevonden'
Een wetenschapper zegt fragmenten te hebben gevonden van de beruchte Tunguska-meteoriet, meldt het Russische staatspersbureau Ria Novosti.

Op 30 juni 1908 vond in het Siberische Tunguska een enorme explosie plaats die een groot gebied verwoestte. De meest gangbare verklaring is dat het ging om de inslag van een meteoriet. De impact was 1.000 krachtiger dan de atoombom op Hiroshima. Een inslagkrater werd echter nooit gevonden, mogelijk doordat de meteoriet was uiteengespat voor hij de grond raakte.

Andrej Zlobin van het Geologisch Museum van de Russische Academie voor Wetenschappen zegt nu aan de nabij de impactplaats gelegen rivier Khoesmo drie stenen te hebben gevonden die van de meteoriet afkomstig zijn. Zij vertonen sporen van een smeltproces en inkepingen die ontstonden tijdens de gloeiend hete duik in de atmosfeer.

De vondst dateert al van 1988, maar de wetenschapper heeft tot nu gewacht om ermee naar buiten te komen. De stenen wachten nog steeds op een scheikundige analyse en lagen tot 2008 opgeslagen. De reden daarvoor blijft Zlobin schuldig.

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Op dinsdag 7 mei 2013 16:17 schreef Scrummie het volgende:
Japan afgelopen nacht:

Japan Meteor Explosion! 5/6/13

Het aparte:

Gisteravond ging ik rond half 12 even met onze chihuahua naar buiten, en ik kijk dan altijd veel naar sterren en dergelijke. Ik zag dus rond half 12 in noordwestelijke richting exact hetzelfde als er hier op de video gebeurt, maar dan veel en veel kleiner, dus een flits, en een 'tail' bewegend richting het noorden. Nog raarder; het gebeurde 2 keer! Niet op dezelfde plek natuurlijk, maar het was *flits* - tail -> stukje verderop *flits* - tail.

Kan het ook een vallende ster zijn die zon flits produceert? Of kan het gerelateerd zijn aan de meteoriet in Japan? Ik weet het niet namelijk.

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Asteroide the size of a truck buzzes Earth
CAPE CANAVERAL, Florida (Reuters) - An asteroid the size of a small truck zoomed past Earth four times closer than the moon on Saturday, the latest in a parade of visiting celestial objects that has raised awareness of potentially hazardous impacts on the planet.

NASA said Asteroid 2013 LR6 was discovered about a day before its closest approach to Earth, which occurred at 12:42 a.m. EDT (0442 GMT on Saturday) about 65,000 miles over the Southern Ocean, south of Tasmania, Australia.

The 30-foot-wide (10-meter-wide) asteroid posed no threat.

A week ago, the comparatively huge 1.7-mile-wide (2.7-km-wide) asteroid QE2, complete with its own moon in tow, passed 3.6 million miles (5.8 million km) from Earth.

While on February 15, a small asteroid exploded in the atmosphere over Chelyabinsk, Russia, leaving more than 1,500 people injured by flying glass and debris. That same day, an unrelated asteroid passed just 17,200 miles from Earth, closer than the networks of communication satellites that ring the planet.

"There is theoretically a collision possible between asteroids and planet Earth," astronomer Gianluca Masi, with the Virtual Telescope project, said during a Google+ webcast that showed live images of the approaching asteroid.

NASA says it has found about 95 percent of the large asteroids, those with diameters 0.65 miles or larger, with orbits that take them relatively close to Earth.

An object of that size hit the planet about 65 million years ago in what is now Mexico's Yucatan peninsula, triggering a global climate change that is believed to be responsible for the demise of the dinosaurs and many other forms of life on Earth.

The U.S. space agency and other research organizations, as well as private companies, are working on tracking smaller objects that fly near Earth.

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June 24, 2013

More than 10,000 asteroids and comets that can pass near Earth have now been discovered. The 10,000th near-Earth object, asteroid 2013 MZ5, was first detected on the night of June 18, 2013, by the Pan-STARRS-1 telescope, located on the 10,000-foot (convert) summit of the Haleakala crater on Maui. Managed by the University of Hawaii, the PanSTARRS survey receives NASA funding.

Ninety-eight percent of all near-Earth objects discovered were first detected by NASA-supported surveys.

"Finding 10,000 near-Earth objects is a significant milestone," said Lindley Johnson, program executive for NASA's Near-Earth Object Observations Program at NASA Headquarters, Washington. "But there are at least 10 times that many more to be found before we can be assured we will have found any and all that could impact and do significant harm to the citizens of Earth." During Johnson's decade-long tenure, 76 percent of the NEO discoveries have been made.

Near-Earth objects (NEOs) are asteroids and comets that can approach the Earth's orbital distance to within about 28 million miles (45 million kilometers). They range in size from as small as a few feet to as large as 25 miles (41 kilometers) for the largest near-Earth asteroid, 1036 Ganymed.

Asteroid 2013 MZ5 is approximately 1,000 feet (300 meters) across. Its orbit is well understood and will not approach close enough to Earth to be considered potentially hazardous.

"The first near-Earth object was discovered in 1898," said Don Yeomans, long-time manager of NASA's Near-Earth Object Program Office at the Jet Propulsion Laboratory in Pasadena, Calif. "Over the next hundred years, only about 500 had been found. But then, with the advent of NASA's NEO Observations program in 1998, we've been racking them up ever since. And with new, more capable systems coming on line, we are learning even more about where the NEOs are currently in our solar system, and where they will be in the future."

Of the 10,000 discoveries, roughly 10 percent are larger than six-tenths of a mile (one kilometer) in size - roughly the size that could produce global consequences should one impact the Earth. However, the NASA NEOO program has found that none of these larger NEOs currently pose an impact threat and probably only a few dozen more of these large NEOs remain undiscovered.

The vast majority of NEOs are smaller than one kilometer, with the number of objects of a particular size increasing as their sizes decrease. For example, there are expected to be about 15,000 NEOs that are about one-and-half football fields in size (460 feet, or 140 meters), and more than a million that are about one-third a football field in size (100 feet, or 30 meters). A NEO hitting Earth would need to be about 100 feet (30 meters) or larger to cause significant devastation in populated areas. Almost 30 percent of the 460-foot-sized NEOs have been found, but less than 1 percent of the 100-foot-sized NEOs have been detected.

When it originated, the NASA-instituted Near-Earth Object Observations Program provided support to search programs run by the Massachusetts Institute of Technology's Lincoln Laboratory (LINEAR); the Jet Propulsion Laboratory (NEAT); the University of Arizona (Spacewatch, and later Catalina Sky Survey) and the Lowell Observatory (LONEOS). All these search teams report their observations to the Minor Planet Center, the central node where all observations from observatories worldwide are correlated with objects, and they are given unique designations and their orbits are calculated.

"When I began surveying for asteroids and comets in 1992, a near-Earth object discovery was a rare event," said Tim Spahr, director of the Minor Planet Center. "These days we average three NEO discoveries a day, and each month the Minor Planet Center receives hundreds of thousands of observations on asteroids, including those in the main-belt. The work done by the NASA surveys, and the other international professional and amateur astronomers, to discover and track NEOs is really remarkable."

Within a dozen years, the program achieved its goal of discovering 90 percent of near-Earth objects larger than 3,300 feet (1 kilometer) in size. In December 2005, NASA was directed by Congress to extend the search to find and catalog 90 percent of the NEOs larger than 500 feet (140 meters) in size. When this goal is achieved, the risk of an unwarned future Earth impact will be reduced to a level of only one percent when compared to pre-survey risk levels. This reduces the risk to human populations, because once an NEO threat is known well in advance, the object could be deflected with current space technologies.

Currently, the major NEO discovery teams are the Catalina Sky Survey, the University of Hawaii's Pan-STARRS survey and the LINEAR survey. The current discovery rate of NEOs is about 1,000 per year.

NASA's Near-Earth Object Observations Program manages and funds the search for, study of and monitoring of asteroids and comets whose orbits periodically bring them close to Earth. The Minor Planet Center is funded by NASA and hosted by the Smithsonian Astrophysical Observatory in Cambridge, MA. JPL manages the Near-Earth Object Program Office for NASA's Science Mission Directorate in Washington. JPL is a division of the California Institute of Technology in Pasadena. More information about asteroids and near-Earth objects is available at: http://neo.jpl.nasa.gov/, http://www.jpl.nasa.gov/asteroidwatch and via Twitter at http://www.twitter.com/asteroidwatch .