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
2021-02-26 12:54:05	S	10 05 37.308	-13 02 37.07	–	V	C57
2021-02-26 12:54:05	s	1 +71765.852	0 +338410.25	8530.0	–	C57
2021-02-26 13:04:05	S	10 05 35.438	-13 02 22.27	–	V	C57
2021-02-26 13:04:05	s	1 +71415.581	0 +338709.57	9550.0	–	C57
2021-02-26 13:14:05	S	10 05 33.598	-13 02 08.70	–	V	C57
2021-02-26 13:14:05	s	1 +71069.455	0 +339008.09	6320.0	–	C57
2021-02-26 13:24:05	S	10 05 31.699	-13 01 54.62	–	V	C57
2021-02-26 13:24:05	s	1 +70722.868	0 +339305.41	3210.0	–	C57
2021-02-26 13:34:05	S	10 05 29.837	-13 01 40.19	–	V	C57
2021-02-26 13:34:05	s	1 +70376.036	0 +339601.55	9560.0	–	C57
2021-02-26 13:44:05	S	10 05 27.986	-13 01 25.97	–	V	C57
2021-02-26 13:44:05	s	1 +70028.962	0 +339896.52	5360.0	–	C57
2021-02-26 13:54:05	S	10 05 26.102	-13 01 12.11	–	V	C57
2021-02-26 13:54:05	s	1 +69681.649	0 +340190.30	630.0	–	C57
2021-02-26 14:04:05	S	10 05 24.271	-13 00 58.97	–	V	C57
2021-02-26 14:04:05	s	1 +69334.096	0 +340482.91	5350.0	–	C57
2021-02-26 14:14:05	S	10 05 22.385	-13 00 45.50	–	V	C57
2021-02-26 14:14:05	s	1 +68986.307	0 +340774.35	9540.0	–	C57
2021-02-26 14:24:05	S	10 05 20.465	-13 00 31.50	–	V	C57
2021-02-26 14:24:05	s	1 +68638.282	0 +341064.61	3200.0	–	C57
2021-02-26 14:34:05	S	10 05 18.602	-13 00 17.03	–	V	C57
2021-02-26 14:34:05	s	1 +68290.024	0 +341353.70	6330.0	–	C57
2021-02-26 14:44:05	S	10 05 16.800	-13 00 02.30	–	V	C57
2021-02-26 14:44:05	s	1 +67941.534	0 +341641.62	8940.0	–	C57
2021-02-26 14:54:05	S	10 05 14.921	-12 59 48.77	–	V	C57
2021-02-26 14:54:05	s	1 +67592.813	0 +341928.37	1020.0	–	C57
2021-02-26 15:04:05	S	10 05 13.006	-12 59 35.74	–	V	C57
2021-02-26 15:04:05	s	1 +67243.864	0 +342213.95	2590.0	–	C57
2021-02-26 15:14:05	S	10 05 11.155	-12 59 21.84	–	V	C57
2021-02-26 15:14:05	s	1 +66894.687	0 +342498.36	3640.0	–	C57
2021-02-26 15:24:05	S	10 05 09.266	-12 59 08.12	–	V	C57
2021-02-26 15:24:05	s	1 +66545.284	0 +342781.61	4170.0	–	C57
2021-02-26 15:34:05	S	10 05 07.385	-12 58 53.26	–	V	C57
2021-02-26 15:34:05	s	1 +66195.658	0 +343063.69	4200.0	–	C57
2021-02-26 15:44:05	S	10 05 05.518	-12 58 39.58	–	V	C57
2021-02-26 15:44:05	s	1 +65845.809	0 +343344.61	3730.0	–	C57
2021-02-26 15:54:05	S	10 05 03.631	-12 58 25.90	–	V	C57
2021-02-26 15:54:05	s	1 +65495.740	0 +343624.36	2740.0	–	C57
2021-02-26 16:04:05	S	10 05 01.723	-12 58 12.58	–	V	C57
2021-02-26 16:04:05	s	1 +65145.451	0 +343902.95	1260.0	–	C57
2021-02-26 16:14:05	S	10 04 59.810	-12 57 58.03	–	V	C57
2021-02-26 16:14:05	s	1 +64794.944	0 +344180.38	9290.0	–	C57
2021-02-26 16:24:05	S	10 04 57.941	-12 57 44.14	–	V	C57
2021-02-26 16:24:05	s	1 +64444.221	0 +344456.65	6820.0	–	C57
2021-02-26 16:34:05	S	10 04 56.090	-12 57 29.59	–	V	C57
2021-02-26 16:34:05	s	1 +64093.284	0 +344731.76	3860.0	–	C57
2021-02-26 16:44:05	S	10 04 54.204	-12 57 15.91	–	V	C57
2021-02-26 16:44:05	s	1 +63742.133	0 +345005.71	410.0	–	C57
2021-02-26 16:54:05	S	10 04 52.334	-12 57 02.05	–	V	C57
2021-02-26 16:54:05	s	1 +63390.771	0 +345278.51	6470.0	–	C57

« Prev 1 2 … 131 132 133 … 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)