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 09:14:05	S	10 01 42.382	-12 33 44.50	–	V	C57
2021-02-27 09:14:05	s	1 +28161.586	0 +366558.25	300.0	–	C57
2021-02-27 09:24:05	S	10 01 40.426	-12 33 30.67	–	V	C57
2021-02-27 09:24:05	s	1 +27796.161	0 +366721.17	1820.0	–	C57
2021-02-27 09:34:05	S	10 01 38.410	-12 33 15.88	–	V	C57
2021-02-27 09:34:05	s	1 +27430.658	0 +366883.02	3110.0	–	C57
2021-02-27 09:44:05	S	10 01 36.408	-12 33 01.58	–	V	C57
2021-02-27 09:44:05	s	1 +27065.077	0 +367043.81	4170.0	–	C57
2021-02-27 09:54:05	S	10 01 34.392	-12 32 47.15	–	V	C57
2021-02-27 09:54:05	s	1 +26699.419	0 +367203.52	5010.0	–	C57
2021-02-27 10:04:05	S	10 01 32.417	-12 32 32.14	–	V	C57
2021-02-27 10:04:05	s	1 +26333.685	0 +367362.17	5640.0	–	C57
2021-02-27 10:14:05	S	10 01 30.432	-12 32 16.80	–	V	C57
2021-02-27 10:14:05	s	1 +25967.877	0 +367519.75	6040.0	–	C57
2021-02-27 10:24:05	S	10 01 28.466	-12 32 02.83	–	V	C57
2021-02-27 10:24:05	s	1 +25601.996	0 +367676.27	6230.0	–	C57
2021-02-27 10:34:05	S	10 01 26.462	-12 31 48.47	–	V	C57
2021-02-27 10:34:05	s	1 +25236.042	0 +367831.72	6200.0	–	C57
2021-02-27 10:44:05	S	10 01 24.456	-12 31 34.61	–	V	C57
2021-02-27 10:44:05	s	1 +24870.017	0 +367986.10	5970.0	–	C57
2021-02-27 10:54:05	S	10 01 22.471	-12 31 19.63	–	V	C57
2021-02-27 10:54:05	s	1 +24503.922	0 +368139.42	5520.0	–	C57
2021-02-27 11:04:05	S	10 01 20.458	-12 31 04.48	–	V	C57
2021-02-27 11:04:05	s	1 +24137.759	0 +368291.68	4870.0	–	C57
2021-02-27 11:14:05	S	10 01 18.449	-12 30 49.39	–	V	C57
2021-02-27 11:14:05	s	1 +23771.527	0 +368442.88	4010.0	–	C57
2021-02-27 11:24:05	S	10 01 16.493	-12 30 35.17	–	V	C57
2021-02-27 11:24:05	s	1 +23405.229	0 +368593.01	2950.0	–	C57
2021-02-27 11:34:05	S	10 01 14.486	-12 30 20.70	–	V	C57
2021-02-27 11:34:05	s	1 +23038.866	0 +368742.08	1690.0	–	C57
2021-02-27 11:44:05	S	10 01 12.478	-12 30 06.12	–	V	C57
2021-02-27 11:44:05	s	1 +22672.438	0 +368890.09	230.0	–	C57
2021-02-27 11:54:05	S	10 01 10.531	-12 29 52.19	–	V	C57
2021-02-27 11:54:05	s	1 +22305.947	0 +369037.05	8580.0	–	C57
2021-02-27 12:04:05	S	10 01 08.460	-12 29 37.14	–	V	C57
2021-02-27 12:04:05	s	1 +21939.394	0 +369182.94	6730.0	–	C57
2021-02-27 12:14:05	S	10 01 06.504	-12 29 21.48	–	V	C57
2021-02-27 12:14:05	s	1 +21572.780	0 +369327.77	4690.0	–	C57
2021-02-27 12:24:05	S	10 01 04.493	-12 29 07.19	–	V	C57
2021-02-27 12:24:05	s	1 +21206.106	0 +369471.55	2460.0	–	C57
2021-02-27 12:34:05	S	10 01 02.450	-12 28 52.82	–	V	C57
2021-02-27 12:34:05	s	1 +20839.373	0 +369614.26	40.0	–	C57
2021-02-27 12:44:05	S	10 01 00.482	-12 28 38.89	–	V	C57
2021-02-27 12:44:05	s	1 +20472.583	0 +369755.92	7440.0	–	C57
2021-02-27 12:54:05	S	10 00 58.428	-12 28 24.02	–	V	C57
2021-02-27 12:54:05	s	1 +20105.736	0 +369896.53	4650.0	–	C57
2021-02-27 13:04:05	S	10 00 56.460	-12 28 08.33	–	V	C57
2021-02-27 13:04:05	s	1 +19738.833	0 +370036.08	1680.0	–	C57
2021-02-27 13:14:05	S	10 00 54.437	-12 27 53.10	–	V	C57
2021-02-27 13:14:05	s	1 +19371.876	0 +370174.57	8540.0	–	C57

« Prev 1 2 … 136 137 138 … 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)