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
2013-01-13 08:23:21	C	08 47 52.28	-22 50 08.3	–	u	H06
2013-01-13 08:36:27	C	08 47 48.78	-22 49 50.2	–	u	H06
2013-01-13 20:16:15	C	08 45 01.309	-22 33 48.32	15.96	q	C20
2013-01-13 20:20:35	C	08 45 00.185	-22 33 42.53	15.95	q	C20
2013-01-13 20:22:52	C	08 44 59.588	-22 33 39.49	15.93	q	C20
2013-01-13 20:25:25	C	08 44 58.924	-22 33 36.09	15.9	q	C20
2013-01-13 20:26:03	C	08 44 58.752	-22 33 35.16	15.88	q	C20
2013-01-13 20:26:42	C	08 44 58.590	-22 33 34.25	15.88	q	C20
2013-01-13 20:27:20	C	08 44 58.421	-22 33 33.56	15.94	q	C20
2013-01-13 20:27:58	C	08 44 58.251	-22 33 32.60	15.89	q	C20
2013-01-13 20:28:36	C	08 44 58.088	-22 33 31.82	15.87	q	C20
2013-01-13 20:29:14	C	08 44 57.941	-22 33 31.12	15.89	q	C20
2013-01-13 20:29:52	C	08 44 57.755	-22 33 29.99	15.89	q	C20
2013-01-13 20:30:30	C	08 44 57.590	-22 33 29.04	15.81	q	C20
2013-01-13 20:31:09	C	08 44 57.419	-22 33 28.29	15.9	q	C20
2013-01-13 20:32:29	C	08 44 57.083	-22 33 26.71	15.81	q	C20
2013-01-13 20:32:52	C	08 44 56.972	-22 33 25.94	15.87	q	C20
2013-01-13 20:40:05	C	08 44 55.087	-22 33 16.40	15.88	q	C20
2013-01-13 20:40:43	C	08 44 54.920	-22 33 15.24	15.93	q	C20
2013-01-13 20:41:22	C	08 44 54.758	-22 33 14.59	15.94	q	C20
2013-01-13 20:42:00	C	08 44 54.580	-22 33 13.53	15.97	q	C20
2013-01-13 20:42:38	C	08 44 54.422	-22 33 12.80	15.92	q	C20
2013-01-13 20:43:16	C	08 44 54.253	-22 33 11.84	15.88	q	C20
2013-01-13 20:43:54	C	08 44 54.088	-22 33 11.21	15.9	q	C20
2013-01-13 20:44:32	C	08 44 53.925	-22 33 10.27	15.96	q	C20
2013-01-13 20:45:10	C	08 44 53.755	-22 33 09.22	15.9	q	C20
2013-01-13 20:45:49	C	08 44 53.589	-22 33 08.52	15.88	q	C20
2013-01-13 20:46:59	C	08 44 53.284	-22 33 07.06	–	q	C20
2013-01-13 20:48:19	C	08 44 52.912	-22 33 04.95	–	q	C20
2013-01-13 20:49:19	C	08 44 52.669	-22 33 03.60	–	q	C20
2013-01-13 20:50:21	C	08 44 52.395	-22 33 02.43	–	q	C20
2013-01-13 20:51:31	C	08 44 52.094	-22 33 00.77	–	q	C20
2013-01-13 20:52:39	C	08 44 51.810	-22 32 59.44	–	q	C20
2013-01-13 20:53:58	C	08 44 51.446	-22 32 57.27	–	q	C20
2013-01-13 20:55:40	C	08 44 51.019	-22 32 55.34	–	q	C20
2013-01-13 20:57:10	C	08 44 50.614	-22 32 53.06	–	q	C20
2013-01-13 20:58:56	C	08 44 50.141	-22 32 50.73	–	q	C20
2013-01-13 21:00:21	C	08 44 49.773	-22 32 48.53	–	q	C20
2013-01-13 21:02:08	C	08 44 49.324	-22 32 46.33	–	q	C20
2013-01-13 21:03:32	C	08 44 48.939	-22 32 44.35	–	q	C20
2013-01-13 21:04:54	C	08 44 48.581	-22 32 42.46	–	q	C20
2013-01-13 21:06:39	C	08 44 48.140	-22 32 40.17	–	q	C20
2013-01-13 21:16:58	C	08 44 45.435	-22 32 26.12	–	q	C20
2013-01-13 21:21:41	C	08 44 44.176	-22 32 19.54	–	q	C20
2013-01-13 21:23:56	C	08 44 43.583	-22 32 16.40	–	q	C20
2013-01-13 21:26:17	C	08 44 42.961	-22 32 13.03	–	q	C20
2013-01-13 21:28:34	C	08 44 42.374	-22 32 10.04	–	q	C20
2013-01-13 21:29:59	C	08 44 41.999	-22 32 08.10	–	q	C20
2013-01-13 21:31:42	C	08 44 41.546	-22 32 05.68	–	q	C20
2013-01-13 21:33:13	C	08 44 41.128	-22 32 03.54	–	q	C20

« Prev 1 2 … 46 47 48 … 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)