Asteroid General Data

2004 MN₄ (99942 Apophis)

General information

Preliminary designation	2004 MN₄
Name	Apophis
Number	99942
Group	Aten
Absolute magnitude	19.00
Approximate diameter (m)	420
Approximate mass (kg)	1.37·10¹¹
Number of observations	9419
Arc length (days)	6599

Approaches

Date	Object	r, AU	r, km
04/13/2029 09:50:24 PM	Earth	0.000254	38 042
04/14/2029 02:32:38 PM	Moon	0.000642	95 998

Orbit initial data

Date of initial data	09/17/2026
M – mean anomaly (degrees)	286.594662
a – orbit major semiaxis (astronomical units)	0.92233339
e – orbit eccentricity	0.19118287
ω – orbit ascending node-perihelion angle (degrees)	126.684110
Ω – longitude of orbit ascending node (degrees)	203.892611
i – orbit inclination to the ecliptic plane (degrees)	3.341087

Orbital evolution

Date	M	a	e	ω	Ω	i	q	P
01/13/1829	260.790960	0.92306775	0.19360923	120.494869	211.135015	2.849146	0.74435332	0.886852
01/21/1858	161.948393	0.92346427	0.19345629	120.978703	210.147429	2.866213	0.74481430	0.887423
01/29/1887	10.648797	0.92591221	0.19042207	121.593677	208.428262	3.298067	0.74959808	0.890954
02/07/1916	205.522742	0.92774168	0.18973704	122.106147	207.346171	3.304062	0.75171472	0.893596
02/14/1945	18.535355	0.92728870	0.18957262	123.084273	206.319966	3.307635	0.75150015	0.892942
02/22/1974	217.491001	0.92578457	0.19016827	124.077002	205.359733	3.323082	0.74972972	0.890770
03/02/2003	78.030457	0.92198018	0.19119264	126.152761	204.585316	3.333245	0.74570436	0.885285
03/09/2032	130.256538	1.10302180	0.18905857	71.418859	203.546609	2.220641	0.89448608	1.158449
03/17/2061	147.417706	1.10363308	0.18928827	71.340470	203.085255	2.226183	0.89472828	1.159412
03/25/2090	146.050127	1.10435921	0.18941331	71.952394	202.537103	2.236521	0.89517888	1.160556
04/03/2119	136.971382	1.10587204	0.18963499	73.252154	201.283758	2.288682	0.89616001	1.162942
04/10/2148	129.550462	1.10582887	0.18949251	75.050105	200.159824	2.334521	0.89628258	1.162874
04/18/2177	83.913148	1.11294604	0.19176383	73.387687	199.413714	2.256714	0.89952325	1.174118

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