| 99942 Apophis (2004 MN4) |
| Classification: Aten [NEO, PHA] SPK-ID: 2099942 |
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| Orbit Diagram
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| Note:
Make sure you have Java enabled on your browser to see the applet.
This applet is provided as a 3D orbit visualization tool.
The applet was implemented using 2-body methods,
and hence should not be used for determining accurate long-term trajectories
(over several years or decades) or planetary encounter circumstances.
For accurate long-term ephemerides, please instead use our Horizons system. |
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Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.
Orbit Viewer applet originally written and kindly provided by
Osamu Ajiki (AstroArts),
and further modified by
Ron Baalke (JPL).
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Orbital Elements at Epoch 2454800.5 (2008-Nov-30.0) TDB
Reference: JPL 140 (heliocentric ecliptic J2000)
| Element | Value | Uncertainty (1-sigma) | Units |
| e | .1912119299890948 | 7.6088e-08 | |
| a | .9224221637574083 | 2.3583e-08 | AU |
| q | .7460440415606373 | 8.6487e-08 | AU |
| i | 3.331425002325445 | 2.024e-06 | deg |
| node | 204.4451349657969 | 0.00010721 | deg |
| peri | 126.4064496795719 | 0.00010632 | deg |
| M | 254.9635275775066 | 5.7035e-05 | deg |
| tp | 2454894.912750123770
(2009-Mar-04.41275013) | 5.4824e-05 | JED |
| period | 323.5884570441701
0.89 | 1.2409e-05
3.397e-08 | d
yr |
| n | 1.112524233059586 | 4.2665e-08 | deg/d |
| Q | 1.098800285954179 | 2.8092e-08 | AU |
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| | Orbit Determination Parameters
Additional Information
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[ show covariance matrix ]
Physical Parameter Table
| Parameter |
Symbol |
Value |
Units |
Sigma |
Reference |
Notes |
| absolute magnitude |
H |
19.7 |
mag |
0.4 |
Delbo, Cellino and Tedesco (Icarus 2007) |
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| magnitude slope |
G |
0.25 |
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n/a |
Delbo, Cellino and Tedesco (Icarus 2007) |
based on taxonomic type (Bowell et al., Asteroids II) |
| diameter |
diameter |
0.270 |
km |
0.06 |
Delbo, Cellino and Tedesco (Icarus 2007) |
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| geometric albedo |
albedo |
0.33 |
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0.08 |
Delbo, Cellino and Tedesco (Icarus 2007) |
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| 99942 Apophis | Discovered 2004 June 19 by R. A. Tucker, D. J. Tholen and F. Bernardi at Kitt Peak. |
| Also known as Apep, the Destroyer, Apophis is the Egyptian god of evil and destruction who dwelled in eternal darkness. As a result of its passage within 40~000 km of the earth on 2029 Apr. 13, this minor planet will move from the Aten to the Apollo class. |
| NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) |
| Reference: 20050721/MPCPages.arc | Last Updated: 2005-07-21 |
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