Archive:Earth-impact events - Revision history

wikademia>Wikademia: moved Earth-impact events to Archive:Earth-impact events

2009-06-07T14:57:36Z

moved Earth-impact events to Archive:Earth-impact events

← Older revision	Revision as of 14:57, 7 June 2009
(No difference)

wikademia>Wikademia: Text replace - 'w:' to 'Wikipedia:'

2009-04-11T18:13:37Z

Text replace - 'w:' to 'Wikipedia:'

← Older revision		Revision as of 18:13, 11 April 2009
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	[[Image:Asteroidimpact.jpg\|right\|thumb\|450px\|Is this artist's impression of an asteroid colliding with Earth too [[w:Sensationalism\|sensationalistic]]? (''See [http://oklo.org/?p=194 Impact!], and [[/Discussion\|discuss]]'')]]		[[Image:Asteroidimpact.jpg\|right\|thumb\|450px\|Is this artist's impression of an asteroid colliding with Earth too [[Wikipedia:Sensationalism\|sensationalistic]]? (''See [http://oklo.org/?p=194 Impact!], and [[/Discussion\|discuss]]'')]]

	What objects exist in space near the Earth? How often do they collide with our planet? What are the risks of such an impact? Is this something that we should be worried about? Have scientists and journalists done a good job of informing the public? Please read the infomation on this page and visit the links, and then join the [[/Discussion\|discussion]].		What objects exist in space near the Earth? How often do they collide with our planet? What are the risks of such an impact? Is this something that we should be worried about? Have scientists and journalists done a good job of informing the public? Please read the infomation on this page and visit the links, and then join the [[/Discussion\|discussion]].
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	== The science of Near-Earth objects ==		== The science of Near-Earth objects ==

	[[Image:Meteor.jpg\|thumb\|right\|250px\|[[w:Meteor Crater\|Meteor Crater]] is the result of an Earth impact 50,000 years ago.]]		[[Image:Meteor.jpg\|thumb\|right\|250px\|[[Wikipedia:Meteor Crater\|Meteor Crater]] is the result of an Earth impact 50,000 years ago.]]

	The [[w:Solar System\|Solar System]] consists of the [[w:Sun\|Sun]], the [[w:Planets\|planets]] and their [[w:Natural satellite\|moons]], and many [[w:Small Solar System body\|smaller objects]]. These smaller objects include [[w:asteroid\|asteroids]], [[w:comet\|comets]] and large [[w:meteoroid\|meteoroids]]. Most of these objects are distant from the Earth and never pass close to our planet. For example, the vast majority of asteroids orbit within the [[w:Asteroid belt\|main asteroid belt]]. But there are objects that are known to approach the Earth very closely, and many have [[w:Impact event\|collided with our planet]] thoughout its history. These [[w:Near-Earth objects\|Near-Earth objects]] include some that are [[w:Potentially Hazardous Asteroids\|potentially hazardous]].		The [[Wikipedia:Solar System\|Solar System]] consists of the [[Wikipedia:Sun\|Sun]], the [[Wikipedia:Planets\|planets]] and their [[Wikipedia:Natural satellite\|moons]], and many [[Wikipedia:Small Solar System body\|smaller objects]]. These smaller objects include [[Wikipedia:asteroid\|asteroids]], [[Wikipedia:comet\|comets]] and large [[Wikipedia:meteoroid\|meteoroids]]. Most of these objects are distant from the Earth and never pass close to our planet. For example, the vast majority of asteroids orbit within the [[Wikipedia:Asteroid belt\|main asteroid belt]]. But there are objects that are known to approach the Earth very closely, and many have [[Wikipedia:Impact event\|collided with our planet]] thoughout its history. These [[Wikipedia:Near-Earth objects\|Near-Earth objects]] include some that are [[Wikipedia:Potentially Hazardous Asteroids\|potentially hazardous]].

	=== Near-Earth objects ===		=== Near-Earth objects ===

	'''Near-Earth objects''' ('''NEO''') are asteroids, comets and large meteoroids whose orbits bring them close to [[w:Earth\|Earth]]'s orbit, and which may therefore pose a collision danger.		'''Near-Earth objects''' ('''NEO''') are asteroids, comets and large meteoroids whose orbits bring them close to [[Wikipedia:Earth\|Earth]]'s orbit, and which may therefore pose a collision danger.

	* On October 7, 2008 a meteoroid called [[w:2008_TC3\|2008 TC<sub>3</sub>]] which was 2 - 5 meters (7 - 16 ft) in diameter entered Earth's atmosphere and burned up before it reached the ground. The object had just been discovered about a day before the impact. It exploded tens of kilometers above the ground with the energy of around 1 - 2 [[w:TNT equivalent\|kiloton of TNT]], causing a large fireball in the early morning sky over northern [[w:Sudan\|Sudan]]. An impact like this happens 2 - 4 times per year, but this is the first time that such an object has been observed and tracked before entering the atmosphere.		* On October 7, 2008 a meteoroid called [[Wikipedia:2008_TC3\|2008 TC<sub>3</sub>]] which was 2 - 5 meters (7 - 16 ft) in diameter entered Earth's atmosphere and burned up before it reached the ground. The object had just been discovered about a day before the impact. It exploded tens of kilometers above the ground with the energy of around 1 - 2 [[Wikipedia:TNT equivalent\|kiloton of TNT]], causing a large fireball in the early morning sky over northern [[Wikipedia:Sudan\|Sudan]]. An impact like this happens 2 - 4 times per year, but this is the first time that such an object has been observed and tracked before entering the atmosphere.

	=== Potentially Hazardous Asteroids ===		=== Potentially Hazardous Asteroids ===

	'''Potentially Hazardous Asteroids''' ('''PHA''') are [[w:Near-Earth asteroids\|Near-Earth asteroids]] that are big enough to cause unprecedented regional devastation if they were to hit the Earth.		'''Potentially Hazardous Asteroids''' ('''PHA''') are [[Wikipedia:Near-Earth asteroids\|Near-Earth asteroids]] that are big enough to cause unprecedented regional devastation if they were to hit the Earth.

	[[Image:Toutatis.jpg\|thumb\|right\|Radar image of 4179 Toutatis]]		[[Image:Toutatis.jpg\|thumb\|right\|Radar image of 4179 Toutatis]]

	* On September 29, 2004 the asteroid [[w:4179 Toutatis\|4179 Toutatis]] made a particularly close approach (within 4 LD, or [[w:lunar distance (astronomy)\|lunar distance]]s) from Earth. The next close approach is November 9, 2008, but it will be five times more distant. It is about 4.6 km by 2.4 km in size.		* On September 29, 2004 the asteroid [[Wikipedia:4179 Toutatis\|4179 Toutatis]] made a particularly close approach (within 4 LD, or [[Wikipedia:lunar distance (astronomy)\|lunar distance]]s) from Earth. The next close approach is November 9, 2008, but it will be five times more distant. It is about 4.6 km by 2.4 km in size.

	* The asteroid 2007 CN26 passed within 0.6 LD of the Earth on September 2, 1985. The size of this object is in the range of 170 - 380 meters in diameter. It was not discovered until February 2007, more than 20 years after the close approach to the Earth.		* The asteroid 2007 CN26 passed within 0.6 LD of the Earth on September 2, 1985. The size of this object is in the range of 170 - 380 meters in diameter. It was not discovered until February 2007, more than 20 years after the close approach to the Earth.

	* There is some concern that the asteroid [[w:99942 Apophis\|99942 Apophis]] could impact earth on April 13, 2036. It is about 210 - 330 meters in size. The probability of a collision is currently esitmated to be 1 in 45,000. These calculations are uncertain due to another close encounter in 2029 which will modify the orbit of the asteroid, making a collision either more or less likely. New measurements possible in 2011-2013 will likely confirm that the asteroid will miss the earth.		* There is some concern that the asteroid [[Wikipedia:99942 Apophis\|99942 Apophis]] could impact earth on April 13, 2036. It is about 210 - 330 meters in size. The probability of a collision is currently esitmated to be 1 in 45,000. These calculations are uncertain due to another close encounter in 2029 which will modify the orbit of the asteroid, making a collision either more or less likely. New measurements possible in 2011-2013 will likely confirm that the asteroid will miss the earth.

	* The asteroid [[w:2007 VK184\|2007 VK184]] is currently estimated to have a probability of 1 in 3,030 of impacting Earth on June 3, 2048. This 130 meter object has the potential of releasing 150 megatons of energy if it were to collide.		* The asteroid [[Wikipedia:2007 VK184\|2007 VK184]] is currently estimated to have a probability of 1 in 3,030 of impacting Earth on June 3, 2048. This 130 meter object has the potential of releasing 150 megatons of energy if it were to collide.

	=== Close-Approaches ===		=== Close-Approaches ===

	[[Image:2004mn4can s.gif\|thumb\|right\|275px\|The close approach of 99942 Apophis to the Earth and Moon on April 13, 2029 will [[w:Perturbation (astronomy)\|alter]] the orbit of the asteroid.]]		[[Image:2004mn4can s.gif\|thumb\|right\|275px\|The close approach of 99942 Apophis to the Earth and Moon on April 13, 2029 will [[Wikipedia:Perturbation (astronomy)\|alter]] the orbit of the asteroid.]]

	{\| border="1" cellpadding="3" cellspacing="2"		{\| border="1" cellpadding="3" cellspacing="2"
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	== In fiction ==		== In fiction ==

	* [[w:Impact_events#Fictional_impact_events\|Fictional impact events]]		* [[Wikipedia:Impact_events#Fictional_impact_events\|Fictional impact events]]
	* [[w:Asteroids_in_fiction#Collisions_with_Earth\|Fictional asteroid collisions with Earth]]		* [[Wikipedia:Asteroids_in_fiction#Collisions_with_Earth\|Fictional asteroid collisions with Earth]]
	* [[w:Off on a comet\|Off on a comet]] ([[w:Jules Verne\|Jules Verne]] novel)		* [[Wikipedia:Off on a comet\|Off on a comet]] ([[Wikipedia:Jules Verne\|Jules Verne]] novel)
	* [[w:Meteor (film)\|''Meteor'']] (1979 film)		* [[Wikipedia:Meteor (film)\|''Meteor'']] (1979 film)
	* [[w:Armageddon (1998 film)\|''Armageddon'']] (1998 film)		* [[Wikipedia:Armageddon (1998 film)\|''Armageddon'']] (1998 film)
	* [[w:Deep Impact (film)\|''Deep Impact'']] (1998 film)		* [[Wikipedia:Deep Impact (film)\|''Deep Impact'']] (1998 film)

	== In the news ==		== In the news ==
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	== See also ==		== See also ==

	* [[w:Near-Earth object]]		* [[Wikipedia:Near-Earth object]]
	* [[w:Near-Earth asteroid]]		* [[Wikipedia:Near-Earth asteroid]]
	* [[w:Potentially hazardous asteroid]]		* [[Wikipedia:Potentially hazardous asteroid]]
	* [[w:Impact event]]		* [[Wikipedia:Impact event]]
	* [[Asteroid Surveys]]		* [[Asteroid Surveys]]
	* [[n:Asteroid to fly by Earth]] - January 24, 2008		* [[n:Asteroid to fly by Earth]] - January 24, 2008

	[[Category:Astronomy]]		[[Category:Astronomy]]

wikademia>Wikademia at 18:02, 11 April 2009

2009-04-11T18:02:34Z

← Older revision		Revision as of 18:02, 11 April 2009
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	What objects exist in space near the Earth? How often do they collide with our planet? What are the risks of such an impact? Is this something that we should be worried about? Have scientists and journalists done a good job of informing the public? Please read the infomation on this page and visit the links, and then join the [[/Discussion\|discussion]].		What objects exist in space near the Earth? How often do they collide with our planet? What are the risks of such an impact? Is this something that we should be worried about? Have scientists and journalists done a good job of informing the public? Please read the infomation on this page and visit the links, and then join the [[/Discussion\|discussion]].
			{{ntnes}}
	== The science of Near-Earth objects ==		== The science of Near-Earth objects ==

wikademia>Wikademia: 89 revisions

2009-04-08T15:25:11Z

89 revisions

← Older revision	Revision as of 15:25, 8 April 2009
(No difference)

wikademia>TaviGreiner: /* Older news */

2008-12-12T14:45:26Z

Older news

← Older revision		Revision as of 14:45, 12 December 2008
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	* [http://neo.jpl.nasa.gov/news/news157.html Near-Earth Asteroid 2007 TU24 to Pass Close to Earth on Jan. 29 - Should be Observable with Modest Sized Telescopes] - January 22, 2008		* [http://neo.jpl.nasa.gov/news/news157.html Near-Earth Asteroid 2007 TU24 to Pass Close to Earth on Jan. 29 - Should be Observable with Modest Sized Telescopes] - January 22, 2008
	* [http://www.theaustralian.news.com.au/story/0,25197,23100798-30417,00.html Asteroid to narrowly miss Earth] - January 24, 2008		* [http://www.theaustralian.news.com.au/story/0,25197,23100798-30417,00.html Asteroid to narrowly miss Earth] - January 24, 2008
			* [http://www.slooh.com/blog/suv-sized-asteroid-makes-surprise-pass-between-the-earth-moon/ Asteroid Slips Between Earth and the Moon] - February 7, 2008

	== Commentary ==		== Commentary ==

wikademia>TaviGreiner: /* Current */

2008-12-12T14:41:08Z

Current

← Older revision		Revision as of 14:41, 12 December 2008
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	* [http://neo.jpl.nasa.gov/news/news159.html Small Asteroid Predicted to Cause Brilliant Fireball over Northern Sudan] - October 6, 2008		* [http://neo.jpl.nasa.gov/news/news159.html Small Asteroid Predicted to Cause Brilliant Fireball over Northern Sudan] - October 6, 2008
	* [http://news.nationalgeographic.com/news/2008/10/081006-asteroid-fireball.html Boulder-Size Asteroid to Be Fireball Over Earth Monday] - October 6, 2008		* [http://news.nationalgeographic.com/news/2008/10/081006-asteroid-fireball.html Boulder-Size Asteroid to Be Fireball Over Earth Monday] - October 6, 2008
			* [http://www.slooh.com/blog/2008-tc3-a-serendipitous-event/ 2008 TC3 - A Serendipitous Event] - October 7, 2008
	* [http://neo.jpl.nasa.gov/news/news160.html Impact of Asteroid 2008 TC3 Confirmed] - October 7, 2008		* [http://neo.jpl.nasa.gov/news/news160.html Impact of Asteroid 2008 TC3 Confirmed] - October 7, 2008
	* [http://blogs.discovermagazine.com/80beats/2008/10/08/incoming-asteroid-burned-up-in-earths-atmosphere-right-on-time/ Incoming Asteroid Burned Up in Earth's Atmosphere Right on Time] - October 8, 2008		* [http://blogs.discovermagazine.com/80beats/2008/10/08/incoming-asteroid-burned-up-in-earths-atmosphere-right-on-time/ Incoming Asteroid Burned Up in Earth's Atmosphere Right on Time] - October 8, 2008

wikademia>Mu301: /* Close-Approaches */ update

2008-11-21T12:08:52Z

Close-Approaches: update

← Older revision		Revision as of 12:08, 21 November 2008
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	\|- style="background: #CCF;"		\|- style="background: #CCF;"
	\|2008-Nov-04\|\|2008 VC\|\|11 - 25 m\|\|4.4 LD		\|2008-Nov-04\|\|2008 VC\|\|11 - 25 m\|\|4.4 LD
			\|-
			\|- style="background: #CCF;"
			\|2008-Nov-16\|\|2008 WO2\|\|3.0 - 6.7 m\|\|1.0 LD
			\|-
			\|- style="background: #CCF;"
			\|2008-Nov-18\|\|2004 XK3\|\|36 - 80 m\|\|1.8 LD
	\|}		\|}

wikademia>Mu301: /* Close-Approaches */ update table 1

2008-11-08T04:56:45Z

Close-Approaches: update table 1

← Older revision		Revision as of 04:56, 8 November 2008
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	\|-		\|-
	\|- style="background: #CCF;"		\|- style="background: #CCF;"
	\|2008-Oct-30\|\|2005 VU\|\|65 - 150 m\|\|3.7 LD		\|2008-Oct-30\|\|2005 VU3\|\|65 - 150 m\|\|3.7 LD
	\|-		\|-
	\|- style="background: #CCF;"		\|- style="background: #CCF;"
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	\|-		\|-
	\|- style="background: #CCF;"		\|- style="background: #CCF;"
	\|2008-Nov-04\|\|2008 VC\|\|11 - 24 m\|\|4.4 LD		\|2008-Nov-04\|\|2008 VB4\|\|5.8 - 13 m\|\|1.3 LD
			\|-
			\|- style="background: #CCF;"
			\|2008-Nov-04\|\|2008 VC\|\|11 - 25 m\|\|4.4 LD
	\|}		\|}

wikademia>Mu301: /* Current */ add link

2008-11-06T18:37:57Z

Current: add link

← Older revision		Revision as of 18:37, 6 November 2008
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	* [http://www.news.com.au/heraldsun/story/0,21985,24482099-5012751,00.html Who's watching our skies?] - October 12, 2008		* [http://www.news.com.au/heraldsun/story/0,21985,24482099-5012751,00.html Who's watching our skies?] - October 12, 2008
	* [http://www.azstarnet.com/news/264185 Asteroid searcher hopes his discoveries won't produce direct impact] - October 26, 2008		* [http://www.azstarnet.com/news/264185 Asteroid searcher hopes his discoveries won't produce direct impact] - October 26, 2008
			* [http://neo.jpl.nasa.gov/news/2008tc3.html Asteroid 2008 TC3 Strikes Earth: Predictions and Observations Agree] - November 4, 2008

	=== Older news ===		=== Older news ===

wikademia>Mu301: /* Close-Approaches */ update table 2

2008-11-06T12:53:27Z

Close-Approaches: update table 2

← Older revision		Revision as of 12:53, 6 November 2008
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	\|2008-Jul-14\|\|2008 BT18\|\|670 - 1500 m\|\|5.9 LD		\|2008-Jul-14\|\|2008 BT18\|\|670 - 1500 m\|\|5.9 LD
	\|-		\|-
	\|2008-Dec-23\|\|2008 EV5\|\|~~240~~ - ~~540~~ m\|\|8.4 LD		\|2008-Dec-23\|\|2008 EV5\|\|270 - 600 m\|\|8.4 LD
	\|-		\|-
	\|2009-Feb-10\|\|2006 AS2\|\|~~210~~ - ~~470~~ m\|\|9.2 LD		\|2009-Feb-10\|\|2006 AS2\|\|230 - 520 m\|\|9.2 LD
	\|-		\|-
	\|2009-Feb-18\|\|1999 AQ10\|\|240 - 540 m\|\|4.4 LD		\|2009-Feb-18\|\|1999 AQ10\|\|240 - 540 m\|\|4.4 LD