| 99942 Apophis (2004 MN4) |
| Classification: Aten [NEO, PHA] SPK-ID: 2099942 |
[ show orbit diagram ]
Orbital Elements at Epoch 2454372.5 (2007-Sep-29.0) TDB
Reference: JPL 181 (heliocentric ecliptic J2000)
| Element | Value | Uncertainty (1-sigma) | Units |
| e | .1910724921863873 | 4.4913e-09 | |
| a | .9222824917187505 | 9.3339e-10 | AU |
| q | .7460596775261777 | 3.7734e-09 | AU |
| i | 3.331278078343216 | 3.9353e-07 | deg |
| node | 204.457606080342 | 1.9205e-05 | deg |
| peri | 126.3945727618261 | 1.8774e-05 | deg |
| M | 138.7561828590544 | 4.1253e-06 | deg |
| tp | 2454247.806384803235
(2007-May-27.30638480) | 3.5886e-06 | JED |
| period | 323.5149637723417
0.89 | 4.9112e-07
1.345e-09 | d
yr |
| n | 1.11277696648781 | 1.6893e-09 | deg/d |
| Q | 1.098505305911323 | 1.1117e-09 | AU |
|
Additional Model Parameters
| Parameter | Value | Uncertainty (1-sigma) |
| A2 [EST] | -4.246359581117515E-16 | 1.437E-14 |
| ALN [SET] | 1. | n/a |
| NK [SET] | 0. | n/a |
| NM [SET] | 2. | n/a |
| R0 [SET] | 1. | n/a |
|
| | Orbit Determination Parameters
Additional Information
|
[ 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) |
|
| 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.arc | Last Updated: 2005-07-21 |
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[ show close-approach data ]
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