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
2021-02-25 09:24:05	s	1 +123952.71	2 +271708.81	70.0	–	C57
2021-02-25 09:34:05	S	10 10 26.542	-13 39 12.20	–	V	C57
2021-02-25 09:34:05	s	1 +123676.98	3 +272223.89	7940.0	–	C57
2021-02-25 09:44:05	S	10 10 24.878	-13 38 59.14	–	V	C57
2021-02-25 09:44:05	s	1 +123400.59	5 +272737.51	4450.0	–	C57
2021-02-25 10:04:05	S	10 10 21.502	-13 38 34.01	–	V	C57
2021-02-25 10:04:05	s	1 +122845.85	7 +273760.40	3400.0	–	C57
2021-02-25 10:14:05	S	10 10 19.858	-13 38 19.75	–	V	C57
2021-02-25 10:14:05	s	1 +122567.51	4 +274269.66	5850.0	–	C57
2021-02-25 10:24:05	S	10 10 18.276	-13 38 07.87	–	V	C57
2021-02-25 10:24:05	s	1 +122288.52	7 +274777.48	6960.0	–	C57
2021-02-25 10:34:05	S	10 10 16.627	-13 37 54.37	–	V	C57
2021-02-25 10:34:05	s	1 +122008.89	9 +275283.85	6740.0	–	C57
2021-02-25 10:44:05	S	10 10 14.959	-13 37 42.89	–	V	C57
2021-02-25 10:44:05	s	1 +121728.63	4 +275788.77	5210.0	–	C57
2021-02-25 10:54:05	S	10 10 13.471	-13 37 26.90	–	V	C57
2021-02-25 10:54:05	s	1 +121447.73	5 +276292.25	2350.0	–	C57
2021-02-25 11:14:05	S	10 10 09.876	-13 37 02.82	–	V	C57
2021-02-25 11:14:05	s	1 +120884.05	3 +277294.89	2720.0	–	C57
2021-02-25 11:24:05	S	10 10 08.179	-13 36 49.21	–	V	C57
2021-02-25 11:24:05	s	1 +120601.27	5 +277794.06	5960.0	–	C57
2021-02-25 12:34:05	S	10 09 56.419	-13 35 17.77	–	V	C57
2021-02-25 12:34:05	s	1 +118604.69	3 +281248.22	2940.0	–	C57
2021-02-25 15:14:05	S	10 09 29.414	-13 31 47.71	–	V	C57
2021-02-25 15:14:05	s	1 +113933.39	7 +288883.61	8530.0	–	C57
2021-02-25 15:24:05	S	10 09 27.658	-13 31 33.78	–	V	C57
2021-02-25 15:24:05	s	1 +113636.68	9 +289348.96	2690.0	–	C57
2021-02-25 16:14:05	S	10 09 19.579	-13 30 31.72	–	V	C57
2021-02-25 16:14:05	s	1 +112145.10	1 +291655.00	6610.0	–	C57
2021-02-25 16:24:05	S	10 09 17.474	-13 30 15.59	–	V	C57
2021-02-25 16:24:05	s	1 +111845.19	6 +292112.08	4060.0	–	C57
2021-02-25 16:34:05	S	10 09 15.780	-13 30 02.52	–	V	C57
2021-02-25 16:34:05	s	1 +111544.76	9 +292567.79	420.0	–	C57
2021-02-25 16:44:05	S	10 09 14.026	-13 29 49.99	–	V	C57
2021-02-25 16:44:05	s	1 +111243.82	3 +293022.13	5680.0	–	C57
2021-02-25 17:04:05	S	10 09 10.673	-13 29 23.28	–	V	C57
2021-02-25 17:04:05	s	1 +110640.38	4 +293926.71	2960.0	–	C57
2021-02-25 17:14:05	S	10 09 08.926	-13 29 10.28	–	V	C57
2021-02-25 17:14:05	s	1 +110337.89	8 +294376.95	4990.0	–	C57
2021-02-25 17:24:05	S	10 09 07.150	-13 28 55.27	–	V	C57
2021-02-25 17:24:05	s	1 +110034.90	4 +294825.83	5940.0	–	C57
2021-02-25 17:34:05	S	10 09 05.484	-13 28 44.00	–	V	C57
2021-02-25 17:34:05	s	1 +109731.40	5 +295273.35	5840.0	–	C57
2021-02-25 17:44:05	S	10 09 03.725	-13 28 29.06	–	V	C57
2021-02-25 17:44:05	s	1 +109427.40	4 +295719.52	4680.0	–	C57
2021-02-25 17:54:05	S	10 09 01.980	-13 28 16.90	–	V	C57
2021-02-25 17:54:05	s	1 +109122.90	5 +296164.32	2470.0	–	C57
2021-02-25 18:04:05	S	10 09 00.298	-13 28 03.29	–	V	C57
2021-02-25 18:04:05	s	1 +108817.90	9 +296607.78	9210.0	–	C57
2021-02-25 18:14:05	S	10 08 58.550	-13 27 50.90	–	V	C57

« Prev 1 2 … 129 130 131 … 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)