| 99942 Apophis (2004 MN4) |
| Classification: Aten [NEO, PHA] SPK-ID: 2099942 |
[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 214 (heliocentric ecliptic J2000)
| Element | Value | Uncertainty (1-sigma) | Units |
| e | .1915088679188845 | 1.237e-09 | |
| a | .922524711665536 | 1.7637e-09 | au |
| q | .7458530485072739 | 2.4352e-09 | au |
| i | 3.336773207452075 | 9.8177e-08 | deg |
| node | 204.0419938887713 | 2.4246e-06 | deg |
| peri | 126.6539581877261 | 2.6314e-06 | deg |
| M | 110.6321810561187 | 5.569e-07 | deg |
| tp | 2459101.040925624416
(2020-Sep-08.54092562) | 5.2995e-07 | TDB |
| period | 323.6424197137346
0.89 | 9.281e-07
2.541e-09 | d
yr |
| n | 1.112338735813507 | 3.1898e-09 | deg/d |
| Q | 1.099196374823798 | 2.1014e-09 | au |
|
Additional Model Parameters
| Parameter | Value | Uncertainty (1-sigma) |
| A1 [EST] | 3.869430936996365E-13 | 4.859E-13 |
| A2 [EST] | -2.898628980466162E-14 | 1.74E-16 |
| 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 |
|
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 |
|
[ show close-approach data ]
|
|
