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
2021-03-01 05:34:05	s	1 -68617.058	0 +373746.28	6710.0	–	C57
2021-03-01 05:44:05	S	09 52 22.776	-11 25 11.50	–	V	C57
2021-03-01 05:44:05	s	1 -68967.796	0 +373640.18	7550.0	–	C57
2021-03-01 05:54:05	S	09 52 20.609	-11 24 56.09	–	V	C57
2021-03-01 05:54:05	s	1 -69318.350	0 +373533.09	8120.0	–	C57
2021-03-01 06:04:05	S	09 52 18.307	-11 24 38.92	–	V	C57
2021-03-01 06:04:05	s	1 -69668.721	0 +373425.03	8420.0	–	C57
2021-03-01 06:14:05	S	09 52 16.200	-11 24 21.74	–	V	C57
2021-03-01 06:14:05	s	1 -70018.907	0 +373315.98	8460.0	–	C57
2021-03-01 06:24:05	S	09 52 14.002	-11 24 05.54	–	V	C57
2021-03-01 06:24:05	s	1 -70368.908	0 +373205.94	8210.0	–	C57
2021-03-01 06:34:05	S	09 52 11.777	-11 23 48.73	–	V	C57
2021-03-01 06:34:05	s	1 -70718.721	0 +373094.93	7700.0	–	C57
2021-03-01 06:44:05	S	09 52 09.569	-11 23 33.36	–	V	C57
2021-03-01 06:44:05	s	1 -71068.346	0 +372982.93	6900.0	–	C57
2021-03-01 06:54:05	S	09 52 07.404	-11 23 17.48	–	V	C57
2021-03-01 06:54:05	s	1 -71417.783	0 +372869.95	5830.0	–	C57
2021-03-01 07:04:05	S	09 52 05.196	-11 23 01.32	–	V	C57
2021-03-01 07:04:05	s	1 -71767.030	0 +372755.98	4470.0	–	C57
2021-03-01 07:14:05	S	09 52 02.969	-11 22 43.32	–	V	C57
2021-03-01 07:14:05	s	1 -72116.086	0 +372641.03	2830.0	–	C57
2021-03-01 07:24:05	S	09 52 00.787	-11 22 27.16	–	V	C57
2021-03-01 07:24:05	s	1 -72464.951	0 +372525.10	910.0	–	C57
2021-03-01 07:34:05	S	09 51 58.639	-11 22 11.53	–	V	C57
2021-03-01 07:34:05	s	1 -72813.623	0 +372408.18	8700.0	–	C57
2021-03-01 07:44:05	S	09 51 56.378	-11 21 55.58	–	V	C57
2021-03-01 07:44:05	s	1 -73162.101	0 +372290.28	6200.0	–	C57
2021-03-01 07:54:05	S	09 51 54.190	-11 21 39.20	–	V	C57
2021-03-01 07:54:05	s	1 -73510.384	0 +372171.40	3410.0	–	C57
2021-03-01 08:04:05	S	09 51 51.998	-11 21 22.86	–	V	C57
2021-03-01 08:04:05	s	1 -73858.472	0 +372051.54	330.0	–	C57
2021-03-01 08:14:05	S	09 51 49.786	-11 21 05.04	–	V	C57
2021-03-01 08:14:05	s	1 -74206.363	0 +371930.69	6960.0	–	C57
2021-03-01 09:24:05	S	09 51 34.375	-11 19 10.88	–	V	C57
2021-03-01 09:24:05	s	1 -76636.010	0 +371057.21	4960.0	–	C57
2021-03-01 09:34:05	S	09 51 32.112	-11 18 54.94	–	V	C57
2021-03-01 09:34:05	s	1 -76982.292	0 +370928.49	9160.0	–	C57
2021-03-01 09:44:05	S	09 51 29.914	-11 18 38.59	–	V	C57
2021-03-01 09:44:05	s	1 -77328.368	0 +370798.79	3060.0	–	C57
2021-03-01 09:54:05	S	09 51 27.754	-11 18 22.72	–	V	C57
2021-03-01 09:54:05	s	1 -77674.238	0 +370668.10	6650.0	–	C57
2021-03-01 10:04:05	S	09 51 25.512	-11 18 04.97	–	V	C57
2021-03-01 10:04:05	s	1 -78019.900	0 +370536.43	9920.0	–	C57
2021-03-01 10:14:05	S	09 51 23.311	-11 17 48.55	–	V	C57
2021-03-01 10:14:05	s	1 -78365.354	0 +370403.78	2880.0	–	C57
2021-03-01 10:24:05	S	09 51 21.115	-11 17 32.28	–	V	C57
2021-03-01 10:24:05	s	1 -78710.598	0 +370270.14	5510.0	–	C57
2021-03-01 10:34:05	S	09 51 18.864	-11 17 16.26	–	V	C57
2021-03-01 10:34:05	s	1 -79055.631	0 +370135.52	7830.0	–	C57
2021-03-01 10:44:05	S	09 51 16.642	-11 16 59.99	–	V	C57

« Prev 1 2 … 146 147 148 … 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)