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
2021-03-04 02:32:17	C	09 35 21.91	-09 07 41.4	–	V	W34
2021-03-04 02:34:05	S	09 36 33.149	-09 23 11.54	–	V	C57
2021-03-04 02:34:05	s	1 -183897.15	8 +242792.34	4780.0	–	C57
2021-03-04 02:44:05	S	09 36 30.804	-09 22 51.82	–	V	C57
2021-03-04 02:44:05	s	1 -184055.13	0 +242249.49	5600.0	–	C57
2021-03-04 02:54:05	S	09 36 28.306	-09 22 35.69	–	V	C57
2021-03-04 02:54:05	s	1 -184212.18	0 +241705.43	4760.0	–	C57
2021-03-04 03:04:05	S	09 36 26.052	-09 22 13.44	–	V	C57
2021-03-04 03:04:05	s	1 -184368.30	6 +241160.16	2250.0	–	C57
2021-03-04 03:14:05	S	09 36 23.681	-09 21 54.18	–	V	C57
2021-03-04 03:14:05	s	1 -184523.50	2 +240613.68	8080.0	–	C57
2021-03-04 03:24:05	S	09 36 21.463	-09 21 37.51	–	V	C57
2021-03-04 03:24:05	s	1 -184677.76	6 +240065.98	2210.0	–	C57
2021-03-04 03:38:38	C	09 35 10.27	-09 05 30.6	–	o	691
2021-03-04 03:44:05	S	09 36 16.354	-09 20 54.92	–	V	C57
2021-03-04 03:44:05	s	1 -184983.48	0 +238966.94	5420.0	–	C57
2021-03-04 03:45:35	C	09 35 08.84	-09 05 17.5	–	o	691
2021-03-04 03:52:31	C	09 35 07.42	-09 05 04.6	–	o	691
2021-03-04 03:54:05	S	09 36 14.114	-09 20 36.78	–	V	C57
2021-03-04 03:54:05	s	1 -185134.92	3 +238415.59	4470.0	–	C57
2021-03-04 04:04:05	S	09 36 11.758	-09 20 18.02	–	V	C57
2021-03-04 04:04:05	s	1 -185285.41	7 +237863.03	1810.0	–	C57
2021-03-04 04:14:05	S	09 36 09.444	-09 19 58.04	–	V	C57
2021-03-04 04:14:05	s	1 -185434.95	9 +237309.24	7440.0	–	C57
2021-03-04 04:24:05	S	09 36 07.073	-09 19 38.46	–	V	C57
2021-03-04 04:24:05	s	1 -185583.54	5 +236754.24	1330.0	–	C57
2021-03-04 04:34:05	S	09 36 04.673	-09 19 19.81	–	V	C57
2021-03-04 04:34:05	s	1 -185731.17	0 +236198.01	3500.0	–	C57
2021-03-04 04:44:05	S	09 36 02.304	-09 19 00.77	–	V	C57
2021-03-04 04:44:05	s	1 -185877.83	2 +235640.56	3920.0	–	C57
2021-03-04 04:54:05	S	09 35 59.952	-09 18 41.15	–	V	C57
2021-03-04 04:54:05	s	1 -186023.52	5 +235081.89	2600.0	–	C57
2021-03-04 05:04:05	S	09 35 57.564	-09 18 21.06	–	V	C57
2021-03-04 05:04:05	s	1 -186168.24	6 +234521.98	9510.0	–	C57
2021-03-04 05:14:05	S	09 35 55.181	-09 18 02.27	–	V	C57
2021-03-04 05:14:05	s	1 -186311.99	1 +233960.86	4670.0	–	C57
2021-03-04 05:24:05	S	09 35 52.783	-09 17 43.33	–	V	C57
2021-03-04 05:24:05	s	1 -186454.75	6 +233398.50	8050.0	–	C57
2021-03-04 05:34:05	S	09 35 50.405	-09 17 23.82	–	V	C57
2021-03-04 05:34:05	s	1 -186596.53	5 +232834.91	9650.0	–	C57
2021-03-04 05:44:05	S	09 35 48.079	-09 17 03.70	–	V	C57
2021-03-04 05:44:05	s	1 -186737.32	7 +232270.09	9470.0	–	C57
2021-03-04 05:54:05	S	09 35 45.696	-09 16 44.29	–	V	C57
2021-03-04 05:54:05	s	1 -186877.12	5 +231704.04	7480.0	–	C57
2021-03-04 05:55:24	C	09 34 39.04	-09 01 22.3	–	V	I22
2021-03-04 05:56:23	C	09 34 38.85	-09 01 20.4	–	V	I22
2021-03-04 05:56:53	C	09 34 38.75	-09 01 19.5	–	V	I22
2021-03-04 05:57:22	C	09 34 38.65	-09 01 18.5	–	V	I22
2021-03-04 05:57:52	C	09 34 38.55	-09 01 17.4	–	V	I22
2021-03-04 05:58:23	C	09 34 38.47	-09 01 16.5	–	V	I22

« Prev 1 2 … 164 165 166 … 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)