99942 Apophis (2004 MN4) |
Classification: Aten [NEO, PHA] SPK-ID: 2099942 |
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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 202 (heliocentric ecliptic J2000)
Element | Value | Uncertainty (1-sigma) | Units |
e | .1914747314862192 | 3.2302e-09 | |
a | .9225707252322296 | 9.1785e-10 | au |
q | .7459217433413419 | 3.0067e-09 | au |
i | 3.33685526365591 | 3.2975e-07 | deg |
node | 204.0483896921085 | 2.0409e-05 | deg |
peri | 126.6869627760006 | 2.0004e-05 | deg |
M | 248.1482868749985 | 3.5993e-06 | deg |
tp | 2459101.062965233049 (2020-Sep-08.56296523) | 3.3687e-06 | TDB |
period | 323.6666339069737 0.89 | 4.8302e-07 1.322e-09 | d yr |
n | 1.112255519373273 | 1.6598e-09 | deg/d |
Q | 1.099219707123117 | 1.0936e-09 | au |
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Additional Model Parameters
Parameter | Value | Uncertainty (1-sigma) |
A2 [EST] | -2.93928296520842E-14 | 1.867E-15 |
ALN [SET] | 1. | n/a |
NK [SET] | 0. | n/a |
NM [SET] | 2. | n/a |
R0 [SET] | 1. | n/a |
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| | Orbit Determination Parameters
Additional Information
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[ hide covariance matrix ]
Orbital Elements at Epoch 2454964.5 (2009-May-13.0) TDB
Reference: JPL 202 (heliocentric ecliptic J2000)
Element | Value | Uncertainty (1-sigma) | Units |
e | .191204011250714 | 3.2144e-09 | |
q | .7460553335607374 | 3.0422e-09 | au |
tp | 2454894.907717207282 (2009-Mar-04.40771721) | 1.7813e-06 | TDB |
node | 204.4435396873757 | 2.0436e-05 | deg |
peri | 126.3994400130367 | 2.0007e-05 | deg |
i | 3.331448255732515 | 3.2477e-07 | deg |
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Additional Model Parameters
Parameter | Value | Uncertainty (1-sigma) |
A2 [EST] | -2.93928296520842E-14 | 1.867E-15 |
ALN [SET] | 1. | n/a |
NK [SET] | 0. | n/a |
NM [SET] | 2. | n/a |
R0 [SET] | 1. | n/a |
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| | Orbit Determination Parameters
Additional Information
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Orbit Covariance (7×7)
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|
e |
q |
tp |
node |
peri |
i |
A2 |
e |
1.033238903392658E-17 |
-9.777490670504026E-18 |
4.659846749266874E-15 |
4.717234635868451E-14 |
-4.319479883052553E-14 |
-6.334397447855988E-16 |
1.368334628387404E-24 |
q |
-9.777490670504026E-18 |
9.255220118262506E-18 |
-4.387090146235395E-15 |
-4.504273912278012E-14 |
4.129948320107309E-14 |
6.065545228272281E-16 |
-1.289438174566644E-24 |
tp |
4.659846749266874E-15 |
-4.387090146235395E-15 |
3.173189713829524E-12 |
7.258067368266387E-12 |
-4.83872436864142E-12 |
-2.254845095982445E-14 |
-1.420152005436432E-22 |
node |
4.717234635868451E-14 |
-4.504273912278012E-14 |
7.258067368266387E-12 |
4.176276688710821E-10 |
-4.079669811520337E-10 |
-6.507441824371811E-12 |
1.417688400561E-20 |
peri |
-4.319479883052553E-14 |
4.129948320107309E-14 |
-4.83872436864142E-12 |
-4.079669811520337E-10 |
4.002882008083311E-10 |
6.424790370574386E-12 |
-1.363579332650999E-20 |
i |
-6.334397447855988E-16 |
6.065545228272281E-16 |
-2.254845095982445E-14 |
-6.507441824371811E-12 |
6.424790370574386E-12 |
1.05475168538009E-13 |
-2.308091924138487E-22 |
A2 |
1.368334628387404E-24 |
-1.289438174566644E-24 |
-1.420152005436432E-22 |
1.417688400561E-20 |
-1.363579332650999E-20 |
-2.308091924138487E-22 |
3.48661794994875E-30 |
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Physical Parameter Table
Parameter |
Symbol |
Value |
Units |
Sigma |
Reference |
Notes |
absolute magnitude |
H |
19.7 |
|
0.4 |
Delbo, Cellino and Tedesco (Icarus 2007) |
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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 |
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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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