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
2021-03-03 05:24:05	s	1 -157468.79	6 +302280.47	3590.0	–	C57
2021-03-03 05:34:05	S	09 41 30.257	-10 02 33.40	–	V	C57
2021-03-03 05:34:05	s	1 -157718.91	1 +301882.73	7800.0	–	C57
2021-03-03 05:44:05	S	09 41 27.864	-10 02 14.71	–	V	C57
2021-03-03 05:44:05	s	1 -157968.45	9 +301483.90	1020.0	–	C57
2021-03-03 05:54:05	S	09 41 25.570	-10 01 55.85	–	V	C57
2021-03-03 05:54:05	s	1 -158217.43	6 +301083.98	3250.0	–	C57
2021-03-03 06:04:05	S	09 41 23.239	-10 01 38.14	–	V	C57
2021-03-03 06:04:05	s	1 -158465.84	0 +300682.98	4480.0	–	C57
2021-03-03 06:07:44	C	09 39 13.05	-09 46 02.4	–	o	691
2021-03-03 06:14:05	S	09 41 20.923	-10 01 19.85	–	V	C57
2021-03-03 06:14:05	s	1 -158713.66	9 +300280.89	4710.0	–	C57
2021-03-03 06:24:05	S	09 41 18.588	-10 01 02.03	–	V	C57
2021-03-03 06:24:05	s	1 -158960.92	2 +299877.71	3930.0	–	C57
2021-03-03 06:34:05	S	09 41 16.250	-10 00 43.27	–	V	C57
2021-03-03 06:34:05	s	1 -159207.59	6 +299473.44	2150.0	–	C57
2021-03-03 06:44:05	S	09 41 13.874	-10 00 23.98	–	V	C57
2021-03-03 06:44:05	s	1 -159453.69	0 +299068.08	9360.0	–	C57
2021-03-03 06:54:05	S	09 41 11.484	-10 00 05.83	–	V	C57
2021-03-03 06:54:05	s	1 -159699.20	0 +298661.63	5550.0	–	C57
2021-03-03 06:55:56	C	09 39 02.92	-09 44 32.5	–	o	691
2021-03-03 07:04:05	S	09 41 09.211	-09 59 47.98	–	V	C57
2021-03-03 07:04:05	s	1 -159944.12	5 +298254.09	720.0	–	C57
2021-03-03 07:14:05	S	09 41 06.862	-09 59 30.37	–	V	C57
2021-03-03 07:14:05	s	1 -160188.46	3 +297845.46	4860.0	–	C57
2021-03-03 07:24:05	S	09 41 04.531	-09 59 11.29	–	V	C57
2021-03-03 07:24:05	s	1 -160432.21	2 +297435.73	7980.0	–	C57
2021-03-03 07:34:05	S	09 41 02.234	-09 58 52.79	–	V	C57
2021-03-03 07:34:05	s	1 -160675.36	9 +297024.91	60.0	–	C57
2021-03-03 07:41:47	C	09 38 53.29	-09 43 06.5	–	o	691
2021-03-03 07:44:05	S	09 40 59.818	-09 58 34.72	–	V	C57
2021-03-03 07:44:05	s	1 -160917.93	2 +296612.99	1110.0	–	C57
2021-03-03 07:44:12	C	09 38 52.78	-09 43 01.8	–	o	691
2021-03-03 07:54:05	S	09 40 57.422	-09 58 16.90	–	V	C57
2021-03-03 07:54:05	s	1 -161159.90	0 +296199.98	1120.0	–	C57
2021-03-03 07:56:16	C	09 38 50.26	-09 42 39.2	–	o	691
2021-03-03 08:04:05	S	09 40 55.082	-09 57 58.79	–	V	C57
2021-03-03 08:04:05	s	1 -161401.27	0 +295785.87	80.0	–	C57
2021-03-03 08:08:16	C	09 38 47.75	-09 42 16.8	–	o	691
2021-03-03 08:14:05	S	09 40 52.771	-09 57 39.31	–	V	C57
2021-03-03 08:14:05	s	1 -161642.03	9 +295370.66	8000.0	–	C57
2021-03-03 08:24:05	S	09 40 50.465	-09 57 20.56	–	V	C57
2021-03-03 08:24:05	s	1 -161882.20	6 +294954.36	4860.0	–	C57
2021-03-03 08:34:05	S	09 40 48.091	-09 57 02.34	–	V	C57
2021-03-03 08:34:05	s	1 -162121.76	9 +294536.96	660.0	–	C57
2021-03-03 08:44:05	S	09 40 45.749	-09 56 44.74	–	V	C57
2021-03-03 08:44:05	s	1 -162360.72	5 +294118.45	5410.0	–	C57
2021-03-03 08:54:05	S	09 40 43.363	-09 56 26.45	–	V	C57
2021-03-03 08:54:05	s	1 -162599.07	2 +293698.85	9090.0	–	C57
2021-03-03 09:04:05	S	09 40 41.006	-09 56 06.83	–	V	C57

« Prev 1 2 … 157 158 159 … 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)