99942 Apophis (2004 MN4)

NEO PHA MOID ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar

Orbital Elements

Epoch (TDB)	2025-11-21 (JD 2461000.5)
Eccentricity (e)	0.1911663196 ± 2.00e+00
Semi-major axis (a)	0.9223804710 AU ± 3.00e+00
Inclination (i)	3.34095673° ± 4.00e+00
Long. of Asc. Node (Ω)	203.89962943° ± 5.00e+00
Arg. of Perihelion (ω)	126.67282559° ± 6.00e+00
Mean Anomaly (M)	312.80548085° ± 2.46e-06
Mean Motion (n)	1.1126206784°/day ± 5.43e+00
Perihelion dist (q)	0.74605239 AU ± 3.05e+00
Aphelion dist (Q)	1.09870855 AU ± 4.02e+00
Orbital Period	0.88586012 yr ± 4.32e+00
NGA Model	r2
A1	-3.03172826e-03 AU/d²
A2	-2.37461812e-06 AU/d²

Physical Parameters

H (abs. magnitude)	19.00
G (slope)	0.15

Orbit Solution

Source	IAA
Solution Date	2026-04-29
RMS Residual	0.213″
Uncertainty	0
Orbit Type	Aten
MOID	0.000007 AU
Observations Used	8720
Oppositions	2
Arc Total	2004-2021
First Observation Used	2004-03-15
Last Observation Used	2021-05-20

Observations (10797)

Date	Type	RA	Dec	Mag	Band	Observatory
2021-02-27 00:54:05	S	10 03 20.477	-12 45 45.76	–	V	C57
2021-02-27 00:54:05	s	1 +46305.671	0 +357032.45	4560.0	–	C57
2021-02-27 01:04:05	S	10 03 18.511	-12 45 31.50	–	V	C57
2021-02-27 01:04:05	s	1 +45945.733	0 +357249.80	380.0	–	C57
2021-02-27 01:14:05	S	10 03 16.577	-12 45 16.24	–	V	C57
2021-02-27 01:14:05	s	1 +45585.655	0 +357466.04	5850.0	–	C57
2021-02-27 01:24:05	S	10 03 14.650	-12 45 02.23	–	V	C57
2021-02-27 01:24:05	s	1 +45225.438	0 +357681.17	980.0	–	C57
2021-02-27 01:34:05	S	10 03 12.739	-12 44 47.98	–	V	C57
2021-02-27 01:34:05	s	1 +44865.083	0 +357895.19	5770.0	–	C57
2021-02-27 01:44:05	S	10 03 10.766	-12 44 34.04	–	V	C57
2021-02-27 01:44:05	s	1 +44504.591	0 +358108.11	230.0	–	C57
2021-02-27 01:54:05	S	10 03 08.794	-12 44 19.97	–	V	C57
2021-02-27 01:54:05	s	1 +44143.964	0 +358319.92	4340.0	–	C57
2021-02-27 02:04:05	S	10 03 06.859	-12 44 05.86	–	V	C57
2021-02-27 02:04:05	s	1 +43783.204	0 +358530.63	8130.0	–	C57
2021-02-27 02:14:05	S	10 03 04.942	-12 43 50.45	–	V	C57
2021-02-27 02:14:05	s	1 +43422.310	0 +358740.24	1580.0	–	C57
2021-02-27 02:24:05	S	10 03 02.983	-12 43 35.90	–	V	C57
2021-02-27 02:24:05	s	1 +43061.285	0 +358948.74	4700.0	–	C57
2021-02-27 02:34:05	S	10 03 01.054	-12 43 21.83	–	V	C57
2021-02-27 02:34:05	s	1 +42700.130	0 +359156.15	7500.0	–	C57
2021-02-27 02:44:05	S	10 02 59.088	-12 43 08.00	–	V	C57
2021-02-27 02:44:05	s	1 +42338.847	0 +359362.45	9980.0	–	C57
2021-02-27 02:54:05	S	10 02 57.118	-12 42 54.25	–	V	C57
2021-02-27 02:54:05	s	1 +41977.435	0 +359567.65	2130.0	–	C57
2021-02-27 03:04:05	S	10 02 55.166	-12 42 39.96	–	V	C57
2021-02-27 03:04:05	s	1 +41615.898	0 +359771.75	3970.0	–	C57
2021-02-27 03:14:05	S	10 02 53.239	-12 42 24.59	–	V	C57
2021-02-27 03:14:05	s	1 +41254.235	0 +359974.76	5490.0	–	C57
2021-02-27 03:24:05	S	10 02 51.305	-12 42 10.26	–	V	C57
2021-02-27 03:24:05	s	1 +40892.449	0 +360176.67	6700.0	–	C57
2021-02-27 03:34:05	S	10 02 49.349	-12 41 56.33	–	V	C57
2021-02-27 03:34:05	s	1 +40530.540	0 +360377.48	7600.0	–	C57
2021-02-27 03:44:05	S	10 02 47.383	-12 41 42.40	–	V	C57
2021-02-27 03:44:05	s	1 +40168.511	0 +360577.19	8190.0	–	C57
2021-02-27 03:54:05	S	10 02 45.442	-12 41 28.61	–	V	C57
2021-02-27 03:54:05	s	1 +39806.361	0 +360775.82	8470.0	–	C57
2021-02-27 04:04:05	S	10 02 43.476	-12 41 13.92	–	V	C57
2021-02-27 04:04:05	s	1 +39444.092	0 +360973.34	8450.0	–	C57
2021-02-27 04:14:05	S	10 02 41.522	-12 40 58.19	–	V	C57
2021-02-27 04:14:05	s	1 +39081.706	0 +361169.78	8130.0	–	C57
2021-02-27 04:24:05	S	10 02 39.581	-12 40 44.29	–	V	C57
2021-02-27 04:24:05	s	1 +38719.204	0 +361365.12	7510.0	–	C57
2021-02-27 04:34:05	S	10 02 37.627	-12 40 30.00	–	V	C57
2021-02-27 04:34:05	s	1 +38356.587	0 +361559.37	6590.0	–	C57
2021-02-27 04:44:05	S	10 02 35.650	-12 40 15.85	–	V	C57
2021-02-27 04:44:05	s	1 +37993.856	0 +361752.52	5380.0	–	C57
2021-02-27 04:54:05	S	10 02 33.658	-12 40 01.70	–	V	C57
2021-02-27 04:54:05	s	1 +37631.013	0 +361944.59	3880.0	–	C57

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Radar Observations (50)

Epoch (UTC)	Value	Sigma	Units	Freq (MHz)	Receiver	Transmitter
2005-01-27 23:31:00	-100849.1434	0.25	Hz	2380	-1	-1
2005-01-29 00:00:00	192028507.13	4	us	2380	-1	-1
2005-01-29 00:00:00	-102512.9059	0.25	Hz	2380	-1	-1
2005-01-30 00:18:00	195808170.79	4.5	us	2380	-1	-1
2005-01-30 00:18:00	-103799.8178	0.15	Hz	2380	-1	-1
2005-08-07 17:07:00	8186.8	0.2	Hz	2380	-1	-1
2006-05-06 12:49:00	-118256.8	0.1	Hz	2380	-1	-1
2012-12-21 11:10:00	57992.443	0.25	Hz	8560	-14	-14
2012-12-22 11:00:00	102682986.05	0.25	us	8560	-14	-14
2012-12-22 11:00:00	57880.25	0.1	Hz	8560	-14	-14
2013-01-03 09:20:00	97449107.61	0.25	us	8560	-14	-14
2013-01-03 09:20:00	36629.285	0.1	Hz	8560	-14	-14
2013-01-03 10:00:00	97439308.71	3	us	8560	-14	-14
2013-01-03 10:50:00	97428425.46	0.25	us	8560	-14	-14
2013-01-05 08:40:00	30404.009	0.2	Hz	8560	-14	-14
2013-01-05 10:40:00	96911591.52	0.25	us	8560	-14	-14
2013-01-05 10:40:00	20031.16	0.1	Hz	8560	-14	-14
2013-01-05 10:50:00	96910218.03	3	us	8560	-14	-14
2013-01-06 08:20:00	26660.815	0.1	Hz	8560	-14	-14
2013-01-06 09:30:00	20775.144	0.1	Hz	8560	-14	-14
2013-01-08 08:10:00	15496.441	0.1	Hz	8560	-14	-14
2013-01-09 08:00:00	96451449.73	0.2	us	8560	-14	-14
2013-01-09 08:00:00	9670.119	0.1	Hz	8560	-14	-14
2013-01-09 09:20:00	2690.401	0.1	Hz	8560	-14	-14
2013-01-10 08:00:00	96472652.72	0.2	us	8560	-14	-14
2013-01-10 08:00:00	2590.857	0.1	Hz	8560	-14	-14
2013-01-10 09:40:00	96473924.8	0.2	us	8560	-14	-14
2013-01-11 07:20:00	-1589.599	0.2	Hz	8560	-14	-14
2013-01-14 08:10:00	97258343.56	0.2	us	8560	-14	-14
2013-01-14 08:10:00	-30561.776	0.1	Hz	8560	-14	-14
2013-01-14 09:50:00	97283037.17	0.2	us	8560	-14	-14
2013-01-15 06:30:00	-30666.291	0.1	Hz	8560	-14	-14
2013-01-16 06:30:00	98086754	1	us	8560	-14	-14
2013-01-16 06:30:00	-39582.277	0.2	Hz	8560	-14	-14
2013-01-16 07:50:00	-46641.384	0.1	Hz	8560	-14	-14
2013-01-17 06:20:00	-47875.142	0.1	Hz	8560	-14	-14
2013-02-18 00:56:00	-76760.475	0.2	Hz	2380	-1	-1
2013-02-18 01:37:00	157906444.15	0.25	us	2380	-1	-1
2013-02-18 01:37:00	-78041.365	0.2	Hz	2380	-1	-1
2013-02-19 01:08:00	-78105.657	0.2	Hz	2380	-1	-1
2013-02-20 00:38:00	-78070.341	0.2	Hz	2380	-1	-1
2013-02-20 01:26:00	163578875.87	0.25	us	2380	-1	-1
2013-02-20 01:26:00	-79560.965	0.2	Hz	2380	-1	-1
2013-02-21 01:04:00	-79697.13	0.2	Hz	2380	-1	-1
2013-03-15 23:59:00	235220855.07	2	us	2380	-1	-1
2013-03-15 23:59:00	-80977.5254	0.238	Hz	2380	-1	-1
2021-03-03 06:40:00	29329.8	0.4	Hz	8560	-14	-14
2021-03-05 07:00:00	112426746.52	1	us	8560	-14	-14
2021-03-08 02:50:00	112625015.08	1	us	8560	-14	-14
2021-03-11 08:20:00	113796393.86	1	us	8560	-14	-14

Station codes

-14 DSS-14 Goldstone (70-m) -1 Arecibo (305-m, 1963–2020)