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
2021-03-02 12:24:05	S	09 45 29.186	-10 33 17.64	–	V	C57
2021-03-02 12:24:05	s	1 -129308.96	4 +337271.97	6760.0	–	C57
2021-03-02 12:34:05	S	09 45 26.820	-10 33 00.86	–	V	C57
2021-03-02 12:34:05	s	1 -129607.59	6 +336981.51	4010.0	–	C57
2021-03-02 12:44:05	S	09 45 24.499	-10 32 42.32	–	V	C57
2021-03-02 12:44:05	s	1 -129905.83	3 +336690.03	610.0	–	C57
2021-03-02 12:54:05	S	09 45 22.226	-10 32 24.25	–	V	C57
2021-03-02 12:54:05	s	1 -130203.67	4 +336397.52	6530.0	–	C57
2021-03-02 13:04:05	S	09 45 19.910	-10 32 07.12	–	V	C57
2021-03-02 13:04:05	s	1 -130501.11	7 +336103.99	1790.0	–	C57
2021-03-02 13:14:05	S	09 45 17.647	-10 31 50.23	–	V	C57
2021-03-02 13:14:05	s	1 -130798.16	0 +335809.44	6380.0	–	C57
2021-03-02 13:24:05	S	09 45 15.341	-10 31 32.81	–	V	C57
2021-03-02 13:24:05	s	1 -131094.80	2 +335513.86	290.0	–	C57
2021-03-02 13:34:05	S	09 45 13.054	-10 31 15.35	–	V	C57
2021-03-02 13:34:05	s	1 -131391.04	3 +335217.25	3530.0	–	C57
2021-03-02 13:44:05	S	09 45 10.735	-10 30 56.84	–	V	C57
2021-03-02 13:44:05	s	1 -131686.87	9 +334919.62	6080.0	–	C57
2021-03-02 13:54:05	S	09 45 08.460	-10 30 38.92	–	V	C57
2021-03-02 13:54:05	s	1 -131982.31	1 +334620.95	7960.0	–	C57
2021-03-02 14:04:05	S	09 45 06.144	-10 30 22.07	–	V	C57
2021-03-02 14:04:05	s	1 -132277.33	5 +334321.26	9150.0	–	C57
2021-03-02 14:14:05	S	09 45 03.833	-10 30 04.93	–	V	C57
2021-03-02 14:14:05	s	1 -132571.95	2 +334020.55	9650.0	–	C57
2021-03-02 14:24:05	S	09 45 01.478	-10 29 47.40	–	V	C57
2021-03-02 14:24:05	s	1 -132866.15	9 +333718.80	9470.0	–	C57
2021-03-02 14:34:05	S	09 44 59.220	-10 29 28.68	–	V	C57
2021-03-02 14:34:05	s	1 -133159.95	6 +333416.03	8590.0	–	C57
2021-03-02 14:44:05	S	09 44 56.909	-10 29 10.64	–	V	C57
2021-03-02 14:44:05	s	1 -133453.33	9 +333112.22	7010.0	–	C57
2021-03-02 14:54:05	S	09 44 54.648	-10 28 54.01	–	V	C57
2021-03-02 14:54:05	s	1 -133746.30	9 +332807.39	4740.0	–	C57
2021-03-02 15:04:05	S	09 44 52.337	-10 28 36.66	–	V	C57
2021-03-02 15:04:05	s	1 -134038.86	4 +332501.52	1770.0	–	C57
2021-03-02 15:14:05	S	09 44 49.958	-10 28 19.56	–	V	C57
2021-03-02 15:14:05	s	1 -134331.00	1 +332194.62	8090.0	–	C57
2021-03-02 15:24:05	S	09 44 47.681	-10 28 00.98	–	V	C57
2021-03-02 15:24:05	s	1 -134622.72	0 +331886.70	3700.0	–	C57
2021-03-02 15:34:05	S	09 44 45.418	-10 27 42.73	–	V	C57
2021-03-02 15:34:05	s	1 -134914.01	9 +331577.74	8610.0	–	C57
2021-03-02 15:44:05	S	09 44 43.116	-10 27 25.42	–	V	C57
2021-03-02 15:44:05	s	1 -135204.89	7 +331267.74	2800.0	–	C57
2021-03-02 15:54:05	S	09 44 40.831	-10 27 07.85	–	V	C57
2021-03-02 15:54:05	s	1 -135495.35	2 +330956.72	6280.0	–	C57
2021-03-02 16:04:05	S	09 44 38.453	-10 26 50.64	–	V	C57
2021-03-02 16:04:05	s	1 -135785.38	2 +330644.66	9040.0	–	C57
2021-03-02 16:14:05	S	09 44 36.154	-10 26 32.78	–	V	C57
2021-03-02 16:14:05	s	1 -136074.98	7 +330331.56	1080.0	–	C57
2021-03-02 16:24:05	S	09 44 33.871	-10 26 13.85	–	V	C57
2021-03-02 16:24:05	s	1 -136364.16	4 +330017.43	2390.0	–	C57

« Prev 1 2 … 152 153 154 … 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)