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
2021-02-26 21:04:05	s	1 +54542.393	0 +351725.54	9280.0	–	C57
2021-02-26 21:14:05	S	10 04 02.844	-12 50 57.77	–	V	C57
2021-02-26 21:14:05	s	1 +54186.057	0 +351968.63	3780.0	–	C57
2021-02-26 21:20:32	C	09 59 28.96	-12 48 47.4	–	V	C73
2021-02-26 21:24:05	S	10 04 00.946	-12 50 42.32	–	V	C57
2021-02-26 21:24:05	s	1 +53829.549	0 +352210.58	7870.0	–	C57
2021-02-26 21:29:32	C	09 59 27.02	-12 48 32.7	–	V	C73
2021-02-26 21:34:05	S	10 03 59.018	-12 50 28.10	–	V	C57
2021-02-26 21:34:05	s	1 +53472.871	0 +352451.41	1550.0	–	C57
2021-02-26 21:38:29	C	09 59 25.15	-12 48 18.3	–	V	C73
2021-02-26 21:44:05	S	10 03 57.101	-12 50 14.32	–	V	C57
2021-02-26 21:44:05	s	1 +53116.024	0 +352691.11	4840.0	–	C57
2021-02-26 21:47:27	C	09 59 23.27	-12 48 04.1	–	V	C73
2021-02-26 21:54:05	S	10 03 55.195	-12 50 01.18	–	V	C57
2021-02-26 21:54:05	s	1 +52759.010	0 +352929.69	7720.0	–	C57
2021-02-26 22:04:05	S	10 03 53.237	-12 49 47.03	–	V	C57
2021-02-26 22:04:05	s	1 +52401.829	0 +353167.13	210.0	–	C57
2021-02-26 22:14:05	S	10 03 51.336	-12 49 32.16	–	V	C57
2021-02-26 22:14:05	s	1 +52044.484	0 +353403.46	2310.0	–	C57
2021-02-26 22:24:05	S	10 03 49.428	-12 49 17.83	–	V	C57
2021-02-26 22:24:05	s	1 +51686.975	0 +353638.66	4010.0	–	C57
2021-02-26 22:34:05	S	10 03 47.496	-12 49 03.47	–	V	C57
2021-02-26 22:34:05	s	1 +51329.305	0 +353872.74	5330.0	–	C57
2021-02-26 22:44:05	S	10 03 45.571	-12 48 49.75	–	V	C57
2021-02-26 22:44:05	s	1 +50971.474	0 +354105.69	6260.0	–	C57
2021-02-26 22:54:05	S	10 03 43.625	-12 48 36.11	–	V	C57
2021-02-26 22:54:05	s	1 +50613.483	0 +354337.53	6810.0	–	C57
2021-02-26 23:04:05	S	10 03 41.712	-12 48 22.18	–	V	C57
2021-02-26 23:04:05	s	1 +50255.335	0 +354568.24	6980.0	–	C57
2021-02-26 23:14:05	S	10 03 39.797	-12 48 07.42	–	V	C57
2021-02-26 23:14:05	s	1 +49897.030	0 +354797.84	6780.0	–	C57
2021-02-26 23:15:17	C	09 59 06.59	-12 45 46.7	–	V	Z80
2021-02-26 23:21:58	C	09 59 05.20	-12 45 36.0	–	V	Z80
2021-02-26 23:24:05	S	10 03 37.891	-12 47 52.55	–	V	C57
2021-02-26 23:24:05	s	1 +49538.570	0 +355026.31	6200.0	–	C57
2021-02-26 23:28:38	C	09 59 03.83	-12 45 24.9	–	V	Z80
2021-02-26 23:34:05	S	10 03 35.950	-12 47 38.72	–	V	C57
2021-02-26 23:34:05	s	1 +49179.956	0 +355253.68	5250.0	–	C57
2021-02-26 23:44:05	S	10 03 34.013	-12 47 24.86	–	V	C57
2021-02-26 23:44:05	s	1 +48821.190	0 +355479.92	3920.0	–	C57
2021-02-26 23:54:05	S	10 03 32.066	-12 47 10.82	–	V	C57
2021-02-26 23:54:05	s	1 +48462.273	0 +355705.05	2240.0	–	C57
2021-02-27 00:04:05	S	10 03 30.134	-12 46 56.68	–	V	C57
2021-02-27 00:04:05	s	1 +48103.206	0 +355929.06	190.0	–	C57
2021-02-27 00:14:05	S	10 03 28.243	-12 46 42.20	–	V	C57
2021-02-27 00:14:05	s	1 +47743.990	0 +356151.96	7770.0	–	C57
2021-02-27 00:24:05	S	10 03 26.287	-12 46 27.52	–	V	C57
2021-02-27 00:24:05	s	1 +47384.628	0 +356373.75	5000.0	–	C57
2021-02-27 00:44:05	S	10 03 22.392	-12 45 59.58	–	V	C57
2021-02-27 00:44:05	s	1 +46665.467	0 +356814.00	8390.0	–	C57

« Prev 1 2 … 133 134 135 … 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)