| 99942 Apophis (2004 MN4) |
| Classification: Aten [NEO, PHA] SPK-ID: 2099942 |
[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 201 (heliocentric ecliptic J2000)
| Element | Value | Uncertainty (1-sigma) | Units |
| e | .191474731713038 | 3.2444e-09 | |
| a | .9225707255061436 | 1.9881e-09 | au |
| q | .745921743353552 | 3.4213e-09 | au |
| i | 3.336855220084358 | 3.358e-07 | deg |
| node | 204.0483922876889 | 2.0619e-05 | deg |
| peri | 126.6869602445205 | 2.0205e-05 | deg |
| M | 248.148285934327 | 6.9136e-06 | deg |
| tp | 2459101.062966123569
(2020-Sep-08.56296612) | 6.5312e-06 | TDB |
| period | 323.6666340511201
0.89 | 1.0462e-06
2.864e-09 | d
yr |
| n | 1.112255518877925 | 3.5953e-09 | deg/d |
| Q | 1.099219707658735 | 2.3688e-09 | au |
|
Additional Model Parameters
| Parameter | Value | Uncertainty (1-sigma) |
| A2 [EST] | -2.882874824076915E-14 | 3.888E-15 |
| 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
|
[ hide covariance matrix ]
Orbital Elements at Epoch 2454822.5 (2008-Dec-22.0) TDB
Reference: JPL 201 (heliocentric ecliptic J2000)
| Element | Value | Uncertainty (1-sigma) | Units |
| e | .1912128845943179 | 3.2368e-09 | |
| q | .7460432251075416 | 3.0677e-09 | au |
| tp | 2454894.912651696436
(2009-Mar-04.41265170) | 1.8958e-06 | TDB |
| node | 204.4453890925926 | 2.0638e-05 | deg |
| peri | 126.4061603624787 | 2.0197e-05 | deg |
| i | 3.331437875117176 | 3.3008e-07 | deg |
|
Additional Model Parameters
| Parameter | Value | Uncertainty (1-sigma) |
| A2 [EST] | -2.882874824076915E-14 | 3.888E-15 |
| 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
| Jupiter MOID = 4.12975 au |
| T_jup = 6.465 |
| Nongravitational accels. using nonstandard g(r) = (1 AU/ r)^2.0 |
|
|
Orbit Covariance (7×7)
|
| |
e |
q |
tp |
node |
peri |
i |
A2 |
| e |
1.047666119400409E-17 |
-9.926055175063387E-18 |
4.909881116021864E-15 |
4.653843296950616E-14 |
-4.259843629461694E-14 |
-6.166837591066471E-16 |
7.335166335864171E-26 |
| q |
-9.926055175063387E-18 |
9.410682503015075E-18 |
-4.591352679580688E-15 |
-4.48490434560843E-14 |
4.112408300414402E-14 |
5.980282716461667E-16 |
-2.96742401916092E-25 |
| tp |
4.909881116021864E-15 |
-4.591352679580688E-15 |
3.593909565851593E-12 |
5.892040879932584E-12 |
-3.541800585772594E-12 |
1.014282699780642E-14 |
-2.345777043520376E-21 |
| node |
4.653843296950616E-14 |
-4.48490434560843E-14 |
5.892040879932584E-12 |
4.259262167985737E-10 |
-4.159320593828374E-10 |
-6.673698596512044E-12 |
2.186907592906685E-20 |
| peri |
-4.259843629461694E-14 |
4.112408300414402E-14 |
-3.541800585772594E-12 |
-4.159320593828374E-10 |
4.079345990507304E-10 |
6.583991773293156E-12 |
-2.094895343691202E-20 |
| i |
-6.166837591066471E-16 |
5.980282716461667E-16 |
1.014282699780642E-14 |
-6.673698596512044E-12 |
6.583991773293156E-12 |
1.089504866028434E-13 |
-4.103375903026154E-22 |
| A2 |
7.335166335864171E-26 |
-2.96742401916092E-25 |
-2.345777043520376E-21 |
2.186907592906685E-20 |
-2.094895343691202E-20 |
-4.103375903026154E-22 |
1.511466172500938E-29 |
|
Physical Parameter Table
| Parameter |
Symbol |
Value |
Units |
Sigma |
Reference |
Notes |
| absolute magnitude |
H |
19.7 |
|
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 |
0.34 |
km |
0.04 |
Brozovic et al. (2018) |
Based on 3D shape model derived from radar observations in 2012-2013 |
| 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. Icarus 200 (2009) 480-485 |
|
|
| 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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