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 09:44:05	s	1 -197988.08	3 +124212.42	1750.0	–	C57
2021-02-20 09:54:05	S	10 29 21.886	-16 38 35.81	–	V	C57
2021-02-20 09:54:05	s	1 -197879.98	1 +123442.13	9680.0	–	C57
2021-02-20 10:04:05	S	10 29 19.613	-16 38 22.92	–	V	C57
2021-02-20 10:04:05	s	1 -197769.72	6 +122670.50	3560.0	–	C57
2021-02-20 10:14:05	S	10 29 17.165	-16 38 10.68	–	V	C57
2021-02-20 10:14:05	s	1 -197657.30	4 +121897.52	3360.0	–	C57
2021-02-20 10:24:05	S	10 29 14.868	-16 37 58.37	–	V	C57
2021-02-20 10:24:05	s	1 -197542.70	4 +121123.19	9080.0	–	C57
2021-02-20 10:34:05	S	10 29 12.475	-16 37 45.34	–	V	C57
2021-02-20 10:34:05	s	1 -197425.91	3 +120347.52	670.0	–	C57
2021-02-20 10:44:05	S	10 29 10.082	-16 37 32.56	–	V	C57
2021-02-20 10:44:05	s	1 -197306.91	8 +119570.50	8120.0	–	C57
2021-02-20 10:54:05	S	10 29 07.762	-16 37 19.16	–	V	C57
2021-02-20 10:54:05	s	1 -197185.70	6 +118792.13	1410.0	–	C57
2021-02-20 11:04:05	S	10 29 05.371	-16 37 06.89	–	V	C57
2021-02-20 11:04:05	s	1 -197062.26	4 +118012.42	500.0	–	C57
2021-02-20 11:14:05	S	10 29 02.986	-16 36 54.11	–	V	C57
2021-02-20 11:14:05	s	1 -196936.57	8 +117231.36	5370.0	–	C57
2021-02-20 11:24:05	S	10 29 00.619	-16 36 41.65	–	V	C57
2021-02-20 11:24:05	s	1 -196808.63	6 +116448.96	6000.0	–	C57
2021-02-20 11:34:05	S	10 28 58.334	-16 36 29.09	–	V	C57
2021-02-20 11:34:05	s	1 -196678.42	5 +115665.21	2350.0	–	C57
2021-02-20 11:44:05	S	10 28 55.963	-16 36 16.20	–	V	C57
2021-02-20 11:44:05	s	1 -196545.93	0 +114880.11	4420.0	–	C57
2021-02-20 11:54:05	S	10 28 53.568	-16 36 03.17	–	V	C57
2021-02-20 11:54:05	s	1 -196411.13	8 +114093.67	2150.0	–	C57
2021-02-20 12:04:05	S	10 28 51.166	-16 35 50.57	–	V	C57
2021-02-20 12:04:05	s	1 -196274.03	5 +113305.89	5550.0	–	C57
2021-02-20 12:14:05	S	10 28 48.878	-16 35 38.11	–	V	C57
2021-02-20 12:14:05	s	1 -196134.60	9 +112516.76	4560.0	–	C57
2021-02-20 12:24:05	S	10 28 46.469	-16 35 25.51	–	V	C57
2021-02-20 12:24:05	s	1 -195992.84	4 +111726.29	9180.0	–	C57
2021-02-20 12:34:05	S	10 28 44.122	-16 35 12.55	–	V	C57
2021-02-20 12:34:05	s	1 -195848.72	6 +110934.47	9360.0	–	C57
2021-02-20 12:36:24	C	10 28 21.13	-16 17 14.2	–	V	T05
2021-02-20 12:40:23	C	10 28 20.33	-16 17 09.6	–	V	T05
2021-02-20 12:44:05	S	10 28 41.803	-16 34 59.77	–	V	C57
2021-02-20 12:44:05	s	1 -195702.24	2 +110141.31	5090.0	–	C57
2021-02-20 12:49:40	C	10 28 18.48	-16 16 59.4	–	V	T05
2021-02-20 12:54:05	S	10 28 39.406	-16 34 46.96	–	V	C57
2021-02-20 12:54:05	s	1 -195553.37	6 +109346.81	6340.0	–	C57
2021-02-20 13:04:05	S	10 28 36.955	-16 34 33.71	–	V	C57
2021-02-20 13:04:05	s	1 -195402.11	6 +108550.97	3070.0	–	C57
2021-02-20 13:05:31	C	10 28 15.34	-16 16 40.4	–	V	T05
2021-02-20 13:14:05	S	10 28 34.589	-16 34 20.32	–	V	C57
2021-02-20 13:14:05	s	1 -195248.44	5 +107753.78	5270.0	–	C57
2021-02-20 13:24:05	S	10 28 32.309	-16 34 09.66	–	V	C57
2021-02-20 13:24:05	s	1 -195092.35	0 +106955.26	2890.0	–	C57
2021-02-20 13:34:05	S	10 28 29.897	-16 33 56.56	–	V	C57

« Prev 1 2 … 117 118 119 … 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)