Close encounters #2: Asteroiden scheren langs de aarde

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Op vrijdag 22 oktober 2010 21:37 schreef -CRASH- het volgende:

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70 metertjes

Hoeveel is daar van over na een tripje door de atmosfeer?

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Op zaterdag 23 oktober 2010 22:37 schreef Prutzenberg het volgende:

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Hoeveel is daar van over na een tripje door de atmosfeer?

Ligt eraan uit wat voor een materiaal het is......

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Op zondag 24 oktober 2010 00:40 schreef -CRASH- het volgende:

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Ligt eraan uit wat voor een materiaal het is......

Ja, en de snelheid en invalshoek ook. Ik heb geen zin om uit te zoeken hoe je dat moet berekenen.

2003 UV11 kwam vandaag dus op zijn dichtst langs de aarde. Weliswaar nog 5x afstand aarde maan, maar met een beetje telescoop al te zien vanwege zijn grote omvang (400x800m)

'Ball of fire': Pebble-sized meteorite above U.S. dazzles in night sky over seven states

Streaking across the night sky, a stunning ball of fire shot across the south eastern part of the United States last night - dazzling stargazers with a bright flash.

Authorities say the mysterious flash of light - which could be seen from Oklahoma to the Florida panhandle - was most likely a meteorite.

The object, which was estimated at being no bigger than a pebble, was a stray bit of debris from a recent meteor shower.


Interstellar visitor: The meteorite, which was seen in at least seven states. Experts say the green tinge to the flash suggests the presence of copper in the pebble-sized object

Some reported a green tinge to the light, indicating that the rock may have contained traces of copper.

It was captured on camera by Bryan Bergon, who was out looking at the Orion constellation when he saw the bright light above.

The National Weather Service said they had received dozens of calls about the unidentified object in the sky.


Massive flash: This sequence from another of the King's security cameras show how bright the flash was

Randle Drane, the Emergency Management Director in Copiah County, Mississippi, said residents who saw the light and heard a subsequent boom called to report what the incident.

'The volunteer fire department searched for whatever it was but didn’t come up with anything,' Mr Drane said.

The Sebastian County Sheriff's Office in Arkansas said the meteorite most likely hit near Poteau Mountain, Oklahoma.

Wow dat lijkt me indrukwekkend om dat mee te maken

Niet groter dan een kiezelsteen produceert een zo'n fireball

Ik zou wel schrikken als ik zo dat ziet

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ASTEROID FLYBY: Newly-discovered asteroid 2011 AN52 is flying past Earth today just inside the orbit of the Moon (0.8 LD). The space rock is only 8 meters wide, about the size of a small room, so even experienced amateur astronomers will have trouble photographing it as it zips through the northern constellations Draco and Cygnus glowing like an 18th magnitude star. But it is there

en ook pas 'net' ontdekt... het gaat een keer mis

Tuurlijk gaat het een keer mis, maar wanneer? Dat blijft altijd de vraag.
Laat nou eens een steen van 10 meter hier achter in de voetbalvelden slaan, dan kan ik nog eens lachen *AHUM*

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Comet Elenin was just discovered this past Dec. 2010 by a Russian Astronomer Leonid Elenin. The question is why media hasn’t said anything about it? They have always made a big fuzz in the past about found comets. Is it because it is going to be coming a little too close for comfort and they don’t want people freaking out? Comet Elenin Could Hit Earth. This is a possibility because of the very unstable predictions of the Comet. Preliminary predictions have Comet Elenin coming within 42 million miles of the Earth with a very favorable comet sun angle for observers in the northern hemisphere. This is likely to change somewhat as additional data will tweak the orbit, but as it stands now we will see a spectacular comet in late October or early November 2011. When Comet Elenin first was discovered in December last 2010 it was calculated to pass 8.8 Au (8.8 times the distance of the Sun form us) away. But now these calculations has once changed again. Today the orbital calculation is down to 0.24 Au with a minimum as low as 0.15. But these data is being recalculated all the time and it could get even closer but that depends what it encounters in the Oort belt. Just so you know the Moon is 0.00256 away from us to give you a comparison. We must be aware the this comet could bring enormous amount of debris with it and Earth will pass through the debris trail. This will probably take place around the 6th November 2011 or later.

Bron



http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=C%2F2010%20X1;orb=1;cov=0;log=0;cad=0#orb

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Russian astronomers predicted Apophis may strike Earth on April 13, 2036

"Apophis will approach Earth at a distance of 37,000-38,000 kilometers on April 13, 2029. Its likely collision with Earth may occur on April 13, 2036," Professor Leonid Sokolov of the St. Petersburg State University said.

The scientist said, however, the chance of a collision in 2036 was extremely slim saying that the asteroid would likely disintegrate into smaller parts and smaller collisions with Earth could occur in the following years.

"Our task is to consider various alternatives and develop scenarios and plans of action depending on the results of further observations of Apophis," Sokolov said.

The asteroid, discovered in 2004, is considered the largest threat to our planet, although NASA scientists reduced the likelihood of a hazardous strike with Earth in 2036.

Russia's space agency announced its plans earlier to consider a project to prevent the large asteroid from colliding with Earth

Gewoon, leuk filmpje

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Op vrijdag 28 januari 2011 21:33 schreef Resistor het volgende:

Asteroid Discovery From 1980 - 2010

Gewoon, leuk filmpje

Gewoon ..... omdat het al in Close encounters: Asteroiden op ramkoers (deel 1) staat.

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Op vrijdag 28 januari 2011 22:58 schreef -CRASH- het volgende:

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Gewoon ..... omdat het al in Close encounters: Asteroiden op ramkoers (deel 1) staat.

Ik wist dat ik het eerder gezien had

Maar dat neemt niet weg dat hij alsnog in dit topic thuishoort

2011 CQ1 - Very Close Approach
The newly discovered object, officially designated 2011 CQ1, will make a close Earth approach today February 04, 2011 around 19:40UT at ~0.03(LD)/0.00008(AU) or 11855 km.

2011 CQ1 has been discovered by R. A. Kowalski few hours ago in the course of the "Catalina Sky Survey" with a 0.68-m Schmidt + CCD. The object was moving at roughly 6 "/min and it was of magnitude ~19. According to its absolute magnitude H=32 this is a very small object, in the order of 2-3 meters.

Just few hours after his discovery, we have been able to follow-up this object using remotely a 0.35-m f/3.8 reflector + CCD of "Tzec Maun Observatory" in New Mexico. At the moment of our images (on February 04.46), "2011 CQ1" was moving at 23"/min and its magnitude was ~18.

Here you can see our image (stacking of 20 unfiltered exposures, 10 seconds each). Click on the image for a bigger version:



While this is an animation showing the object movement in the sky:

Video op de site
^{According to Bill Gray (Findorb developer): "That perigee value is solid to within a few kilometers. So no chance of an impact, but still _very_ close!!"}

The orbital element published here, are very interesting:

2011 CQ1
Perigee 2011 Feb 4.818749 TT = 19:38:59 (JD 2455597.318749)
Epoch 2011 Feb 4.8 TT = JDT 2455597.3 Find_Orb
q 11855.6869km (2000.0) P Q
H 32.1 G 0.15 Peri. 156.15870 -0.32177738 -0.84067340
Node 92.60696 -0.92360962 0.17747398
e 1.7936521 Incl. 25.85075 -0.20833766 0.51163581
From 11 observations 2011 Feb. 4 (6.3 hr); mean residual 0".362.

As shown by the ephemeris, 2011 CQ1 will be visible for a few hours. It would be really interesting to follow-up this object in the next few hours, during its very close approach when it will reach the magnitude 14!

UPDATE - February 04, 2011 - 19:35UT

On mpml mailing list, Andrew Lowe pointed out that "that 2011 CQ1 will transit the sun shortly after its close approach. Based on astrometry up to MPEC 2011-C14, its "centre line" will start to cross the earth at Feb. 4.831 UT around N11 E160, with mid-transit at Feb 4.844 (S24 W125; south Pacific) and ending at Feb 04.858 (S29 W30)"

Andrew has supplied three coordinates on the centerline:

First contact: Feb 4.831 UT 11N, 160E (west of the Marshall Islands,
near Enewetak)

Mid-transit: Feb 4.844 UT 24S, 125W (French Polynesia, east of
Pitcairn Island)

Final contact: Feb 4.858 UT 29S, 30W (south Atlantic, off the coast
of Brazil)

Following this suggestion, Bill Gray calculated a transit line plot showing the path over South America. You can see the charts here:

http://www.projectpluto.com/cq1.png

http://www.projectpluto.com/cq1a.png

By Giovanni Sostero & Ernesto Guido

RECORD-SETTING ASTEROID:
Tiny asteroid 2011 CQ1 buzzed Earth on Feb. 4th even closer than we thought. According to JPL's Near Earth Object Program office, the meter-wide space rock was only 5480 km (0.85 Earth radii) over the Pacific Ocean at closest approach. That makes it the nearest non-impacting object in their catalog. The encounter was so close, Earth's gravity altered the course of the asteroid by a whopping 60 degrees.
Full story


Trajectory of Asteroid 2011 CQ1 - February 4, 2011

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Op zaterdag 5 februari 2011 13:31 schreef -CRASH- het volgende:
RECORD-SETTING ASTEROID:
Tiny asteroid 2011 CQ1 buzzed Earth on Feb. 4th even closer than we thought. According to JPL's Near Earth Object Program office, the meter-wide space rock was only 5480 km (0.85 Earth radii) over the Pacific Ocean at closest approach. That makes it the nearest non-impacting object in their catalog. The encounter was so close, Earth's gravity altered the course of the asteroid by a whopping 60 degrees.
Full story

[ link | afbeelding ]
Trajectory of Asteroid 2011 CQ1 - February 4, 2011

Een astroide van 2m groot ongeveer zal niet zo desastreus zijn als deze in zou slaan. Voordat ie de grond bereikt heeft zou ie al voor een groot deel uit elkaar zijn gevallen.

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Op zaterdag 5 februari 2011 13:31 schreef -CRASH- het volgende:
RECORD-SETTING ASTEROID:
Tiny asteroid 2011 CQ1 buzzed Earth on Feb. 4th even closer than we thought. According to JPL's Near Earth Object Program office, the meter-wide space rock was only 5480 km (0.85 Earth radii) over the Pacific Ocean at closest approach. That makes it the nearest non-impacting object in their catalog. The encounter was so close, Earth's gravity altered the course of the asteroid by a whopping 60 degrees.
Full story

[ link | afbeelding ]
Trajectory of Asteroid 2011 CQ1 - February 4, 2011

LOL, hij ging nu wel richting de maan
KABOOM

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Op zondag 6 februari 2011 13:54 schreef Keiichi het volgende:

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Een astroide van 2m groot ongeveer zal niet zo desastreus zijn als deze in zou slaan. Voordat ie de grond bereikt heeft zou ie al voor een groot deel uit elkaar zijn gevallen.

Ik zou toch geen ijzer/nikkel gevalletje van 2 meter op me dak willen krijgen....

Zoals de 2.7 meter grote Hoba meteoriet Grootfontein, Namibia








[ Bericht 11% gewijzigd door -CRASH- op 07-02-2011 05:10:40 ]

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Op maandag 7 februari 2011 04:49 schreef -CRASH- het volgende:

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Ik zou toch geen ijzer/nikkel gevalletje van 2 meter op me dak willen krijgen....

Zoals de 2.7 meter grote Hoba meteoriet Grootfontein, Namibia
[ afbeelding ]

Je mag er vanuit gaan dat die meteoriet wel een stukje groter was toen in nog in de ruimte rond zweefde.

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Op maandag 7 februari 2011 11:49 schreef Keiichi het volgende:

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Je mag er vanuit gaan dat die meteoriet wel een stukje groter was toen in nog in de ruimte rond zweefde.

Rond de Hoba zijn geen andere sporen (brokstukken) gevonden.
Hij is naar onderen gekomen als 1 stuk,

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Found in 1920, early ideas of recovering nickel
from the 60 ton chunk of solid metal soon were abandoned
as uneconomic. A subsequent attempt by the
American Museum of Natural History to obtain the
Hoba Meteorite for its display also came to nothing
because of transport difficulties, after which it was
declared a National Monument in 1955.

Surprisingly, no crater or altered rocks have been found at the impact site,
which together with the mere
fact of its survival as a single mass, suggests a low angle of atmospheric entry and a fairly low velocity to
allow a soft landing. During its passage through the Earth's atmosphere melting caused the shallow pits
and depressions on the meteorites upper surface.

Nog een recente ontdekking die zeer dichtbij de aarde komt

Asteroid: 2011 CA7
Date: February 9
Distance: 0.3 LD
Diameter: 4 m

en:
Asteroid 2009 BD
Date: June 2
Distance: 0.9 LD
Diamter: 9 m

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Op dinsdag 8 februari 2011 11:36 schreef Frutsel het volgende:
Nog een recente ontdekking die zeer dichtbij de aarde komt

Asteroid: 2011 CA7
Date: February 9
Distance: 0.3 LD
Diameter: 4 m

en:
Asteroid 2009 BD
Date: June 2
Distance: 0.9 LD
Diamter: 9 m

het komt steeds dichterbij

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Fireball in the skies over Salem County?
It’s a bird, it’s a plane ... no it’s a meteorite?

If you were lucky enough Monday, at around 12:45 p.m., you looked to the skies over Salem County and saw a majestic, flaming fireball falling through the atmosphere.

“So far we have 30 reports of a fireball moving in a general west to east direction as seen from the northeastern United States,” said American Meteor Society official Robert Lunsford Monday afternoon. “Daylight fireballs are rare and must be exceedingly bright to be noticed with the sun in the sky.”

One sighting happened right here in Salem County.

Woodstown resident Walt McGuniess called the Sunbeam and described the meteorite as it flew over top of Woodstown High School.

“I was out on a walk with my son and then I looked over top of Woodstown High School and this huge meteor came hurdling through the sky,” said McGuniess. “It was spectacular, like a huge fireworks display.”

Lunsford called it a random event.

“This was most likely a random event not associated with any known meteor shower,” said Lunsford. “This object was most likely the size of a small car before striking the upper atmosphere (and beginning to burn up).”

Lunsford said the fireball terminated over the Atlantic Ocean.

“There is no hope for recovering any possible debris,” he said.

A Ridgefield Park man said he saw the fireball after glancing out a window during a break from his work Monday. HL Devore works at GalleryCollection.com in North Jersey.

“It was an amazing sight. I have never seen anything like it,” said Devore. “Their was a flash of light then a trail of smoke.”

Devore took to the computer and as with most types of technology these days the work spread.

Descriptions of sightings exploded on the social networking websites Twitter and Facebook. Posts came from people in New Jersey, Philadelphia, Connecticut, New York and even Egypt.