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
2021-02-20 01:14:05	s	1 -200908.32	5 +161721.11	6690.0	–	C57
2021-02-20 01:24:05	S	10 31 21.444	-16 48 50.44	–	V	C57
2021-02-20 01:24:05	s	1 -200895.65	4 +161018.85	3330.0	–	C57
2021-02-20 01:34:05	S	10 31 19.116	-16 48 38.81	–	V	C57
2021-02-20 01:34:05	s	1 -200881.35	0 +160315.28	6930.0	–	C57
2021-02-20 01:44:05	S	10 31 16.757	-16 48 27.79	–	V	C57
2021-02-20 01:44:05	s	1 -200865.40	3 +159610.39	7450.0	–	C57
2021-02-20 01:54:05	S	10 31 14.414	-16 48 16.13	–	V	C57
2021-02-20 01:54:05	s	1 -200847.80	6 +158904.19	4900.0	–	C57
2021-02-20 02:04:05	S	10 31 12.122	-16 48 04.18	–	V	C57
2021-02-20 02:04:05	s	1 -200828.54	9 +158196.67	9240.0	–	C57
2021-02-20 02:14:05	S	10 31 09.816	-16 47 52.51	–	V	C57
2021-02-20 02:14:05	s	1 -200807.62	5 +157487.83	480.0	–	C57
2021-02-20 02:24:05	S	10 31 07.476	-16 47 41.03	–	V	C57
2021-02-20 02:24:05	s	1 -200785.02	5 +156777.67	8580.0	–	C57
2021-02-20 02:34:05	S	10 31 05.146	-16 47 29.36	–	V	C57
2021-02-20 02:34:05	s	1 -200760.73	9 +156066.19	3530.0	–	C57
2021-02-20 02:44:05	S	10 31 02.791	-16 47 16.94	–	V	C57
2021-02-20 02:44:05	s	1 -200734.76	1 +155353.39	5320.0	–	C57
2021-02-20 02:54:05	S	10 31 00.475	-16 47 05.14	–	V	C57
2021-02-20 02:54:05	s	1 -200707.07	9 +154639.27	3940.0	–	C57
2021-02-20 03:04:05	S	10 30 58.145	-16 46 53.76	–	V	C57
2021-02-20 03:04:05	s	1 -200677.68	7 +153923.82	9350.0	–	C57
2021-02-20 03:14:05	S	10 30 55.774	-16 46 41.77	–	V	C57
2021-02-20 03:14:05	s	1 -200646.57	4 +153207.05	1550.0	–	C57
2021-02-20 03:24:05	S	10 30 53.494	-16 46 30.18	–	V	C57
2021-02-20 03:24:05	s	1 -200613.73	2 +152488.96	510.0	–	C57
2021-02-20 03:34:05	S	10 30 51.091	-16 46 18.05	–	V	C57
2021-02-20 03:34:05	s	1 -200579.15	2 +151769.54	6230.0	–	C57
2021-02-20 03:44:05	S	10 30 48.799	-16 46 06.06	–	V	C57
2021-02-20 03:44:05	s	1 -200542.82	4 +151048.79	8680.0	–	C57
2021-02-20 03:54:05	S	10 30 46.426	-16 45 54.25	–	V	C57
2021-02-20 03:54:05	s	1 -200504.74	0 +150326.72	7850.0	–	C57
2021-02-20 04:04:05	S	10 30 44.131	-16 45 42.16	–	V	C57
2021-02-20 04:04:05	s	1 -200464.89	1 +149603.31	3710.0	–	C57
2021-02-20 04:14:05	S	10 30 41.808	-16 45 30.42	–	V	C57
2021-02-20 04:14:05	s	1 -200423.26	6 +148878.58	6260.0	–	C57
2021-02-20 04:24:05	S	10 30 39.418	-16 45 18.18	–	V	C57
2021-02-20 04:24:05	s	1 -200379.85	6 +148152.52	5460.0	–	C57
2021-02-20 04:34:05	S	10 30 37.109	-16 45 06.30	–	V	C57
2021-02-20 04:34:05	s	1 -200334.65	2 +147425.13	1310.0	–	C57
2021-02-20 04:44:05	S	10 30 34.747	-16 44 54.24	–	V	C57
2021-02-20 04:44:05	s	1 -200287.64	5 +146696.41	3790.0	–	C57
2021-02-20 04:54:05	S	10 30 32.374	-16 44 42.76	–	V	C57
2021-02-20 04:54:05	s	1 -200238.82	4 +145966.35	2870.0	–	C57
2021-02-20 05:04:05	S	10 30 30.103	-16 44 30.52	–	V	C57
2021-02-20 05:04:05	s	1 -200188.18	1 +145234.96	8540.0	–	C57
2021-02-20 05:14:05	S	10 30 27.799	-16 44 18.96	–	V	C57
2021-02-20 05:14:05	s	1 -200135.70	5 +144502.24	780.0	–	C57
2021-02-20 05:24:05	S	10 30 25.392	-16 44 06.76	–	V	C57

« Prev 1 2 … 115 116 117 … 215 216 Next » 10797 observations

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)