Asteroids: Data Files:
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| Summary: | 99942 Apophis (2004 MN4.) |
| Description: | Apophis (2004 MN4) is a near-Earth asteroid that caused a brief period of concern in December 2004 because initial observations indicated a relatively large probability that it would strike the Earth in 2029. However, additional observations provided improved predictions that eliminated the possibility of an impact on Earth or the Moon in 2029. However there remained a possibility that during the 2029 close encounter with Earth, Apophis would pass through a "gravitational keyhole", a precise region in space no more than about 400 meters across, that would set up a future impact on April 13, 2036. This possibility kept the asteroid at Level 1 on the Torino impact hazard scale until August 2006. Additional observations of the trajectory of Apophis revealed the "keyhole" would likely be missed and on August 5, 2006, Apophis was lowered to a Level 0 Torino impact hazard scale. As of October 19, 2006 the impact probability for April 13, 2036 is estimated at 1 in 45,000. An additional impact date in 2037 has been identified, however the impact probability for that encounter is 1 in 12.3 million. Please note that you simply need to copy the SSC file to your Celestia\extras directory to install. You may also wish to modify this file as noted in the comments below. |
| Addon Homepage: | |
| Creator: | Lorenzo Barcella |
| Version: | unknown |
| License: | Copyrighted. |
| Added: | 2007-04-02 07:14 |
| Last modified: | 2010-08-29 17:43 |
| Download: | |
| 2004 MN4 (Apophis) SSC | 443 Bytes |
Comments by visitors:
2012-07-30 14:26
#10 Sirius18933
Hm... Great... i think it's 400.000 Miles away from the earth. now, THIS IS MUCH! How much Astronomical unit! (AU)it's so weird, i hope you can fix this problem.
2012-03-02 11:40
#9 deadless_star
ramiz and pig571 orbit are not hit the target(earth). this addon almost shoot the target. this asteroid orbit will changed because the Earth Gravity. then hit it.
2011-12-31 23:10
#8 anonymous
The orbit is so missed!
The Earth is so far from Apophis!
Bad add-on!
The Earth is so far from Apophis!
Bad add-on!
2008-11-04 16:52
#7 Pig571
Since I'm updating all the SSC's I've created, here is an updated orbital elements from JPL:
(http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2004%20MN4;orb=1;cov=0;log=0#orb)
Eccentricity 0.1912119299890948
SemiMajorAxis 0.9224221637574083
PeriDistance 0.7460440415606373
Inclination 3.331425002325445
AscendingNode 204.4451349657969
ArgOfPericenter 126.4064496795719
MeanAnomaly 254.9635275775066
Epoch 2454894.912750123770
Period 0.89
MeanMotion 1.112524233059586
AphelionDistance 1.098800285954179
(http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2004%20MN4;orb=1;cov=0;log=0#orb)
Eccentricity 0.1912119299890948
SemiMajorAxis 0.9224221637574083
PeriDistance 0.7460440415606373
Inclination 3.331425002325445
AscendingNode 204.4451349657969
ArgOfPericenter 126.4064496795719
MeanAnomaly 254.9635275775066
Epoch 2454894.912750123770
Period 0.89
MeanMotion 1.112524233059586
AphelionDistance 1.098800285954179
2008-04-18 20:33
#6 Excelsior
Well. I just don't get it near the Earth.
It is supposed to be at a distance nearer than 40,000 km from the earth the 2029/04/13 but with the figures from the last comment, it won't come nearer than 1,000,000 km
It is supposed to be at a distance nearer than 40,000 km from the earth the 2029/04/13 but with the figures from the last comment, it won't come nearer than 1,000,000 km
2008-01-06 16:14
#5 ramiz
The orbit is way off. However, I did attempt to correct it based on the JPL Small Body Database from Nasa. Just modify these details in the file and the orbit should work:
Epoch 2453442.5
Period 0.88587
SemiMajorAxis 0.9223779514054623
Eccentricity 0.191054853916459
Inclination 3.330920734685656
AscendingNode 204.4721548004914
ArgOfPericenter 126.3839706419199
MeanAnomaly 183.94709163245
Epoch 2453442.5
Period 0.88587
SemiMajorAxis 0.9223779514054623
Eccentricity 0.191054853916459
Inclination 3.330920734685656
AscendingNode 204.4721548004914
ArgOfPericenter 126.3839706419199
MeanAnomaly 183.94709163245
2007-08-30 21:57
#4 anonymous
Ditto. Your orbit is off. The object never comes close to Earth.
2007-07-16 19:57
#3 anonymous
nice, but I ran the model ahead to 2029 and there was no time where it was close to the earth. Are you sure you have the orbit correct?
2007-07-02 04:05
#2 anonymous
That's an awesome, accurate explanation on that asteroid... why? 'cause I saw it on Naked science yesterday and I also read a article about that same asteroid in the National Geographic. It's totally plausible and I'm convinced it's headed our way,but I got faith,we, as humans, will come up with a strategy to deflect it in another direction and thus save the Earth from another nice crater and the exsistence of humanity!!!
2007-04-02 15:11
#1 anonymous
thats a nice little explanation for this celestial object, i think it could've been improved by creating your own special texture for it though :)
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