Close encounters: Asteroiden op ramkoers

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Op donderdag 29 oktober 2009 14:40 schreef Dunckie het volgende:

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ohnee w8, ik vergis me, dat was een andere, een met inslagkrater

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November 18th, 2009 @ 10:08pm

SALT LAKE CITY -- A fast-moving meteor lit up the night skies over most of Utah just after midnight Wednesday. Moments later, the phones lit up at KSL as people across the state called to tell us what they saw and ask what it was.

Scientists are calling it a "remarkable midnight fireball." The source of all the excitement was basically a rock, falling from space.

In addition to KSL, witnesses to the meteor quickly began call 911.

"I'm currently driving, but I just saw a giant blue flash in the sky, and it came down into the city," a caller from Ogden said.

A caller in Bountiful told dispatchers, "It flashed from the west, and it lit up the whole freakin' neighborhood."

A Salt Lake City caller said, "Ma'am, I'm not kidding you. I am terrified."

Professor David Kieda is chair of the University of Utah's astronomy department. He said the energy of the meteor coming into Earth's atmosphere was so powerful it has to be measured in Terawatts.

"It's almost like the consumption of the United States all at once. It was a fraction of a second," Kieda said.

When a meteor enters the atmosphere, it gives off a lot of heat and light. Folks at the Clark Planetarium say this rock was big--between the size of a microwave and washer-dryer unit.

"I mean this thing lit up the sky, literally. It was like daylight." - Patrick Wiggins, NASA Solar AmbassadorAt exactly 12:07, people from all over the western United States watched as the bolide meteor crashed into Earth's atmosphere. In some areas, the flash of light was so bright it caused light-sensor street lamps to shut off.

Clark Planetarium Director Seth Jarvis said the stony meteorite was probably traveling 80,000 miles an hour when it hit our atmosphere. He said it happened 100 miles up in the air; so despite the brightness, Utah was never in any danger.

"These collisions can do damage, but they are extremely rare; and literally once in a century do you observe something that's actually doing damage," he said.

Witness Andy Bailey said, "Oh, it lit up the whole sky, like almost brighter than the day. It was bright."

Don White was in Wyoming and told KSL Newsradio for a moment he suspected a nuclear strike. "With something that brilliant and that fast, it was like, whoa, did we just get hit or something? It would have been some bigger noise I guess if a nuclear device had gone off," he said.

"I've seen falling stars before, but nothing like that before," said witness James Albin.

KSL received reports that the light show was picked up as far away as Tucson, Santa Fe, Butte and Frisco Peak near Milford in southwest Utah.

The University of Utah has an observatory at 9,500 feet on Frisco Peak, which captured images of the fireball itself.

"All of the sudden the whole entire sky turned blue almost like lightning was striking." - Jon OlschewskiEveryone who saw it has a once-in-a-lifetime story.

Resident Jon Olschewski said, "I noticed to the left something streaking through the sky. It was this meteor that was exploding. It was breaking off into at least five big chunks."

Many surveillance systems captured the spectacular blast of light.

"When you got this mass coming through the atmosphere, and these things are going fast, it's like if you could travel that fast on I-15, you could get from Salt Lake to St. George in a matter of 5 seconds. So these things are really going, hits the atmosphere and it makes so much pressure on its leading edge that it just shatters itself," Jarvis explained.

Roy Merrell also saw the light. He said, "There was this flash in the room, the room basically just lit up."

Others recorded a sequence of shadows as fantastic as any Hollywood studio could create.

Patrick Wiggins, NASA Solar System Ambassador to Utah, said, "To realize it was up so high--people are thinking it's right close--but the thing was up so high it was seen between L.A., Las Vegas and, of course, all over Utah. I mean, this thing was way up there."

Scientists believe it was not part of the famous Leonid debris stream; instead a sporadic asteroid, a midnight fireball, which exploded in the atmosphere with an energy equivalent of up to one kiloton of TNT.

"It was almost, I could say, like celestial," Olschewski said. "You know what I mean? One of those kind of moments like 'oh my gosh,' like 'I'm not ready' kind of thing."

In Tooele County, residents reported that they felt that moment when the meteor shattered. Wiggins said it took about 5 minutes for the sonic boom, but said he's not surprised people felt it.

"Most meteors, you don't hear them, but this one was close enough and big enough that, yeah, you definitely heard the thing. It was exciting," he said.

In fact, seismology monitors at the University of Utah picked up the rumble from the air.

Wiggins said, from his calculations, the pieces of the meteor likely fell over Dugway. He said it's possible meteorites could also be found elsewhere. He said it can't hurt to look around your yard; if you happen to find one it could be worth thousands of dollars.

KSL also received video clips of the meteor from Utah residents. Click on the video links to the right to watch the clips.

Bolide Meteor Over the Salt Lake City, Utah Sky On Nov 18th.

Local - ABC 4.com - Salt Lake City, Utah News3.flv

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Weekend discovery will make close flyby tomorrow
An unusual object will make a close flyby of Earth on Wednesday, coming within only 128,000 km (about 80,000 miles), or at a distance about three times less than the moon’s orbit. The object, named 2010 AL30, is about 10-15 meters long, and asteroid watchers say there is no chance it will hit the planet. But is it an asteroid or perhaps a piece of space junk, like a spent rocket booster?

According to Italian astronomers Ernesto Guido and Giovanni Sostero of the Remanzacco Observatory, who took this image (above) of 2010 AL30, it has an orbital period of almost exactly one year and might be a man-made object.

However, Alan Harris, senior researcher at the Space Science Institute said the object has a perfectly ordinary Earth-crossing orbit.

“Unlikely to be artificial, its orbit doesn’t resemble any useful spacecraft trajectory, and its encounter velocity with Earth is not unusually low,” he said.

The object make its closest approach at 12:48 GMT on Wednesday, and and amateur astronomers are encouraged to observe 2010 AL30 as a 14th magnitude star in the constellations of Orion, Taurus, and Pisces. Check here to get the ephemeris of the object from the Solar System Dynamics website.

Several observatories, including the Goldstone Radar will be observing NEO 2010 AL30 during its Earth flyby. After the January 13 close flyby, it will go too close to the Sun to be observed.

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Astronoom waarschuwt voor vernietiging aarde
Topastronoom Chris Impey waarschuwt voor het einde van de wereld. De man is ervan overtuigd dat een enorme asteroïde vroeg af laat afstevent op onze planeet, en dat het dan gedaan is met de mensheid.

Alle dieren dood
Een inslag van een grote ruimtesteen zou immers aardbevingen en monsterlijke vloedgolven veroorzaken, waardoor alle grote landdieren de pijp uit gaan. Zeedieren zouden snel volgen, aangezien triljoenen tonnen gevaporiseerde rots de planeet drastisch zouden doen afkoelen, en het proces van fotosynthese om zeep zouden helpen.

Voor elk moment
De laatste keer dat dat gebeurde was 65 miljoen jaar geleden, en dergelijke inslagen komen om de 100 miljoen jaar voor, weet Impey. "Dat lijkt misschien een veilige buffer, maar de volgende inslag kan voor elk moment zijn," waarschuwt hij in The Independent. De man heeft ook schrik voor een hypernova van dichter dan 1.000 lichtjaren. Dat zou onze planeet immers in vuur en vlam zetten, voorspelt de wetenschapper.

Buitenverblijf
Impey raadt aan elders te zoeken naar vastgoed. "Titan ziet er veelbelovend uit", besluit hij.

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Op maandag 23 augustus 2010 19:37 schreef Frutsel het volgende:
op 30 oktober van dit jaar zal asteroide 2003 UV11 dicht in onze buurt komen.
Nu gebeurd dit wel vaker, maar deze asteroide heeft een afmeting van ca 350 bij 800 meter.en heeft maar liefst een snelheid van ruim 25 kilometer per seconde.

Wat zou een inslag op aarde aanrichten van dit formaat met zon snelheid?

de "nearmiss" op 30 oktober zal trouwens 5 LD zijn... dat is vijf keer de afstand aarde-maan.
Astronomisch gezien bijzonder dichtbij, voor ons nog erg ver weg... aangezien 1 LD ca 384.000 km is.

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Asteroïden worden geclassificeerd in een aantal types in overeenstemming met hun spectra (en dus ook hun chemische samenstelling) en albedo:


C-type:
Bevat meer dan 75% van de gekende asteroïden: extreem donker (albedo 0,03); gelijkende op koolstofhoudende chondriet meteorieten; ongeveer dezelfde samenstelling als de zon maar geen waterstof, helium en andere vluchtige stoffen;

S-type:
Bevat 17%: tamelijk helder (albedo 0,10- 0,22); deze bestaan uit metallisch nikkel-ijzer gemengd met ijzer- en magnesiumsilicaten;

M-type:
Bevat het meeste van de rest : helder (albedo 0,10- 0,18); zuiver nikkelijzer.
Er zijn ook een dozijn aantal andere minder voorkomende types.
Omdat sommigen moeilijker waar te nemen zijn (bijvoorbeeld de donkere C-types ), komen de hierboven vermelde percentages niet overeen met de reële verdeling van de asteroïden.

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Op woensdag 16 juni 2010 13:24 schreef Frutsel het volgende:

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Ooit zal hij wel gelijk krijgen

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Op woensdag 16 juni 2010 13:24 schreef Frutsel het volgende:

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Ooit zal hij wel gelijk krijgen

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MUST-SEE ASTEROID VIDEO: Astronomer and programmer Scott Manley, formerly of the Armagh Observatory in Northern Ireland, has created a movie showing 30 years of asteroid discoveries in only 3 minutes. Warning: Feelings of claustrophobia have been reported among some viewers. It's crowded out there

Asteroid Discovery From 1980 - 2010

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Op zaterdag 28 augustus 2010 19:54 schreef -CRASH- het volgende:

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Op zondag 29 augustus 2010 11:39 schreef Ermanon het volgende:

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Dat we dan nog niet geraakt zijn is dan best wel bijzonder

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Op zondag 29 augustus 2010 11:39 schreef Ermanon het volgende:

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Dat we dan nog niet geraakt zijn is dan best wel bijzonder

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Op maandag 6 september 2010 16:43 schreef Frutsel het volgende:
Woensdag: Asteroiden scheren langs de aarde

twee asteroides komen er aan... heel dichtbij... nog maar net ontdekt

(2010 RX30) 2010-Sep-08 0.0017 0.6 9.9 m - 22 m 27.1 10.00
(2010 RF12) 2010-Sep-08 0.0005 0.2 6.3 m - 14 m 28.1 6.00

Zie ook http://neo.jpl.nasa.gov/ca/

Mazzel dat het van die kleintjes zijn

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Op zondag 29 augustus 2010 11:39 schreef Ermanon het volgende:

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Dat we dan nog niet geraakt zijn is dan best wel bijzonder

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Op maandag 6 september 2010 16:46 schreef lipjes het volgende:

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wat denk jij, krijgen we impact ?

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Op dinsdag 7 september 2010 14:43 schreef -CRASH- het volgende:

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Ze komen beiden binnen de maanbaan voorbij
2010 RF12 op een afstand van 77,000 km
2010 RX30 op een afstand van 231,000 km.

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Two asteroids are expected to pass within 154,000 miles of Earth on Wednesday -- closer than the distance between the Earth and the moon, NASA announced.

Neither will hit the planet, NASA was quick to add.

Asteroid 2010 RX30 is estimated to be approximately 32 to 65 feet in size and will pass within approximately 154,000 miles of Earth at 5:51 a.m. ET Wednesday. The second object, 2010 RF12, estimated to be 20 to 46 feet in size, will pass within approximately 49,000 miles at 5:12 p.m. ET.

NASA said the Catalina Sky Survey near Tucson, Ariz., discovered both objects on Sunday. The Minor Planet Center in Cambridge, Mass., reviewed the observations and determined the preliminary orbits. The center's personnel concluded both objects would pass within the distance of the moon to Earth, approximately 240,000 miles.

The asteroids should be visible with moderate-sized amateur telescopes.

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Op woensdag 8 september 2010 11:13 schreef kahaarin het volgende:

NASA zegt dat ze gaan missen en dat ze te zien zijn: