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
2013-01-11 20:48:02	C	08 56 37.474	-23 36 23.52	15.95	q	C20
2013-01-11 20:49:50	C	08 56 37.014	-23 36 21.50	16.23	q	C20
2013-01-11 20:51:31	C	08 56 36.566	-23 36 19.55	16.11	q	C20
2013-01-11 20:52:40	C	08 56 36.264	-23 36 17.91	16.12	q	C20
2013-01-11 20:54:16	C	08 56 35.840	-23 36 16.25	16.15	q	C20
2013-01-11 20:55:30	C	08 56 35.515	-23 36 14.91	16.09	q	C20
2013-01-11 20:56:41	C	08 56 35.203	-23 36 13.59	16.17	q	C20
2013-01-11 20:57:56	C	08 56 34.879	-23 36 12.06	16.04	q	C20
2013-01-11 20:58:34	C	08 56 34.693	-23 36 11.12	16.18	q	C20
2013-01-11 20:59:13	C	08 56 34.535	-23 36 10.49	16.05	q	C20
2013-01-11 20:59:51	C	08 56 34.365	-23 36 09.74	16.13	q	C20
2013-01-11 21:01:07	C	08 56 34.037	-23 36 08.51	16.14	q	C20
2013-01-11 21:01:46	C	08 56 33.854	-23 36 07.25	16.15	q	C20
2013-01-11 21:02:24	C	08 56 33.672	-23 36 06.54	16.15	q	C20
2013-01-11 21:03:02	C	08 56 33.514	-23 36 06.03	16.06	q	C20
2013-01-11 21:03:41	C	08 56 33.350	-23 36 05.01	16.04	q	C20
2013-01-11 21:04:19	C	08 56 33.186	-23 36 04.52	16.22	q	C20
2013-01-11 21:04:57	C	08 56 33.022	-23 36 03.64	16.11	q	C20
2013-01-11 21:05:35	C	08 56 32.853	-23 36 02.93	16.15	q	C20
2013-01-11 21:06:13	C	08 56 32.687	-23 36 02.17	16.12	q	C20
2013-01-11 21:06:52	C	08 56 32.498	-23 36 01.40	16.05	q	C20
2013-01-11 21:07:30	C	08 56 32.335	-23 36 00.66	16.02	q	C20
2013-01-11 21:08:08	C	08 56 32.168	-23 36 00.01	15.99	q	C20
2013-01-11 21:08:46	C	08 56 32.000	-23 35 59.21	16.04	q	C20
2013-01-11 21:09:24	C	08 56 31.849	-23 35 58.51	16.04	q	C20
2013-01-11 21:10:01	C	08 56 31.669	-23 35 57.67	16.12	q	C20
2013-01-11 21:10:39	C	08 56 31.497	-23 35 56.86	16.22	q	C20
2013-01-11 21:11:18	C	08 56 31.337	-23 35 55.99	16.18	q	C20
2013-01-11 21:11:56	C	08 56 31.163	-23 35 55.40	16.23	q	C20
2013-01-11 21:12:34	C	08 56 30.995	-23 35 54.63	16.08	q	C20
2013-01-11 21:13:12	C	08 56 30.845	-23 35 53.87	16.13	q	C20
2013-01-11 21:13:50	C	08 56 30.663	-23 35 53.08	16.28	q	C20
2013-01-11 21:14:28	C	08 56 30.488	-23 35 52.43	16.14	q	C20
2013-01-11 21:15:06	C	08 56 30.326	-23 35 51.64	16.26	q	C20
2013-01-11 21:15:44	C	08 56 30.152	-23 35 50.87	16.13	q	C20
2013-01-11 21:16:22	C	08 56 29.983	-23 35 50.01	16.11	q	C20
2013-01-11 21:17:00	C	08 56 29.822	-23 35 49.39	16.08	q	C20
2013-01-11 21:17:38	C	08 56 29.649	-23 35 48.50	16.11	q	C20
2013-01-11 21:18:16	C	08 56 29.476	-23 35 47.84	16.29	q	C20
2013-01-11 21:18:54	C	08 56 29.317	-23 35 47.04	16.1	q	C20
2013-01-11 21:19:32	C	08 56 29.146	-23 35 46.29	16.1	q	C20
2013-01-11 21:20:10	C	08 56 28.982	-23 35 45.47	16.15	q	C20
2013-01-11 21:20:48	C	08 56 28.808	-23 35 44.75	16.01	q	C20
2013-01-11 21:21:26	C	08 56 28.644	-23 35 44.00	16.04	q	C20
2013-01-11 21:22:05	C	08 56 28.466	-23 35 43.26	16.15	q	C20
2013-01-11 21:22:43	C	08 56 28.313	-23 35 42.68	16.14	q	C20
2013-01-11 21:23:21	C	08 56 28.141	-23 35 41.89	16.2	q	C20
2013-01-11 21:23:59	C	08 56 27.969	-23 35 40.98	16.04	q	C20
2013-01-11 21:24:37	C	08 56 27.799	-23 35 40.22	15.99	q	C20
2013-01-11 21:25:15	C	08 56 27.626	-23 35 39.37	16.06	q	C20

« Prev 1 2 … 43 44 45 … 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)