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99942 Apophis (2004 MN4)
Classification: Aten [NEO, PHA]          SPK-ID: 2099942
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbit Diagram
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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Orbit Viewer

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).


Orbital Elements at Epoch 2454441.5 (2007-Dec-07.0) TDB
Reference: JPL 193 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1910795219761208 5.1343e-09  
a .9222788903126814 5.3344e-10 AU
q .7460502808230671 4.7924e-09 AU
i 3.331290217797427 6.5897e-07 deg
node 204.4571896287176 3.3046e-05 deg
peri 126.3936405969297 3.2426e-05 deg
M 215.5399783483177 3.9882e-06 deg
tp 2454571.318624804064
(2008-Apr-14.81862480)
3.6113e-06 JED
period 323.513068841623
0.89
2.8067e-07
7.684e-10
d
yr
n 1.112783484416944 9.6543e-10 deg/d
Q 1.098507499802296 6.3536e-10 AU

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -3.42E-14 8.108E-15
ALN [SET] 1. n/a
NK [SET] 0. n/a
NM [SET] 2. n/a
R0 [SET] 1. n/a
  Orbit Determination Parameters
   # obs. used (total)      496  
   # delay obs. used      13  
   # Doppler obs. used      7  
   data-arc span      3635 days (9.95 yr)  
   first obs. used      2004-03-15  
   last obs. used      2014-02-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .48017  
   data source      ORB  
   producer      Davide Farnocchia  
   solution date      2014-Oct-09 14:48:04  

Additional Information
 Earth MOID = .000659446 AU 
 T_jup = 6.467 
 Nongravitational accels. using nonstandard g(r) = (1 AU/ r)^2.0 
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Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 19.7 mag 0.4 Delbo, Cellino and Tedesco (Icarus 2007)  
magnitude slope G 0.25   n/a Delbo, Cellino and Tedesco (Icarus 2007) based on taxonomic type (Bowell et al., Asteroids II)
diameter diameter 0.325 km 0.015 T. Mueller (2013) http://www.esa.int/Our_Activities/Space_Science/Herschel_intercepts_asteroid_Apophis
rotation period rot_per 30.4 h n/a Behrend (2005) combined light-curve on-line at http://obswww.unige.ch/~behrend/r099942a.png
geometric albedo albedo 0.23   n/a T. Mueller (2013) http://www.esa.int/Our_Activities/Space_Science/Herschel_intercepts_asteroid_Apophis
SMASSII spectral type spec_B Sq   n/a Binzel, R. P. et al. Spectral properties and composition of potentially hazardo  

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.arcLast Updated: 2005-07-21

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Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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