Talk:Near-Earth asteroid
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[edit] Independent verification
Does someone have some independent verification of the June 6, 2002 impact over the Mediterranean? The only place I could find anything was at http://www.rense.com/general27/asteroidimpactsetoff.htm, which is a UFO site, so it could be completely made up and bogus. Does someone have a subscription to Aerospace Daily to double-check? -- hike395 12:02, 29 Aug 2003 (UTC)
- http://www.astronomy.com/Content/Dynamic/Articles/000/000/001/016bokal.asp - Patrick 12:19, 29 Aug 2003 (UTC)
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- OK, thanks! -- hike395
- and http://phobos.astro.uwo.ca/~pbrown/documents/flux-final.pdf - Patrick 12:28, 29 Aug 2003 (UTC)
[edit] Update article
Someone should update this article to mention 2004 MN4. --SgeoTC 21:19, Dec 27, 2004 (UTC)
[edit] Apoheles
The article states:
The Atens, which have average orbital radii closer than one astronomical unit (AU, the distance from the Earth to the Sun) and aphelia of greater than Earth's perihelion, placing them usually inside the orbit of Earth.
But Apoheles are subclasses of Atens, and do not cross Earth's orbit. Isn't the article misleading? 24.68.180.163 06:23, 21 September 2006 (UTC)
[edit] Frequency of impact
In the heading "The NEA Threat", it states that "Small collisions, equivalent to a thousand tonnes of TNT, occur a few times each month.". I have doubts about this, mostly because I have done a lot of research on this topic and found that to be inaccurate, but also because it is stated that "they estimated that similar sized asteroids come as close [42,600 km] about every two years" in the same section. So, if a small asteroid (30m) only comes within 42,600 km of the Earth every 2 years, then how is it that "small collisions, equivalent to a thousand tonnes of TNT, occur a few times each month"? Can an asteroid of fewer that 30m really cause a 1000 tonne explosion? E.boyer7 01:39, 22 October 2006 (UTC)
- A 30-m object produces a MEGATONNE explosion, not a kilotonne. The kilotonne figure is for few-meter objects, which airburst in the stratosphere. This figure is very well based, from US Air Force monitoring satellites. The flux of megatonne explosions is less well constrained, based on only a few events over the last century. Michaelbusch 03:21, 22 October 2006 (UTC)
[edit] Merge with near-earth object?
Does anyone think that it would be a good idea to merge this article with near-earth object? Lunokhod 21:02, 25 January 2007 (UTC)
- I weakly oppose. The definitions are somewhat different. Michaelbusch 21:28, 25 January 2007 (UTC)
[edit] Capture
Is there any possibility that an asteroid could, rather than passing by or colliding, be catpured by Earth's gravity and pulled into orbit? 71.203.209.0 08:34, 21 February 2007 (UTC)
- Generally not. You can contort the dynamics such that this is possible, but it is rare and requires either very specific trajectories or a binary object. Michaelbusch 16:05, 21 February 2007 (UTC)
- Binary object? Would this include the Earth-Moon system?Abramul 01:32, 17 March 2007 (UTC)
- No. You need a binary asteroid. Michaelbusch 02:22, 17 March 2007 (UTC)
