Author Topic: Asteroids, Meteors & Comets.  (Read 1284 times)

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Offline icrcc

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Asteroids, Meteors & Comets.
« on: March 20, 2013, 09:30:57 AM »
Near Earth Objects are those objects whose orbit brings it into close to the Earth. There are literally thousands of them. They are divided into three categories. They are Near Earth meteoroids (rocks with diameters <50M), Near Earth Asteroids (rocks with diameters >50M), and Near Earth comets.

A 50m Near Earth meteoroid sounds pretty big but if one of these were to impact Earth they would not cause widespread damage. Near Earth meteoroids are not therefore considered a significant risk. Near Earth Objects approach distances are measured in lunar distances (LD) The Moon being 1 LD from the Earth (384,000Km). Each month there are, on average fifteen predicted close approaches you can always see the current courtesy of spaceweather.com.  Most that pass per month are in the metre range but there is usually at least one that is approximately 2Km in size.

Any object with a diameter 100 m and passes within 19.5 LD is further classified as a potentially hazardous object (PHO). There are 1331 potentially hazardous object known (approximately 85 comets the rest are asteroids). However this number is estimated to be only about 25% of the total. We are discovering new ones all the time. In the event of impact with these would cause significant regional damage and would be devastating to humanity. Impacts like this occur on average around once per 10,000 years.
It may never happen. Best to be prepared just in case.

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Offline icrcc

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Re: Asteroids, Meteors & Comets.
« Reply #1 on: September 18, 2013, 10:46:27 AM »
Comet ISON is still more than two months away from its encounter with the sun. At the moment with a magnitude of +12.5 it is too dim to be seen by the naked eye.  The comet will make a close approach to the Mars on October 1st, and during that time Mars satellites will be taking ISON's picture at point blank range. I can't wit to see those images.
It may never happen. Best to be prepared just in case.

http://www.preparingforthefuture.org/index.php
http://ontariopreparedness.com/