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 17:04:05	S	10 04 50.405	-12 56 48.26	–	V	C57
2021-02-26 17:04:05	s	1 +63039.199	0 +345550.15	2060.0	–	C57
2021-02-26 17:14:05	S	10 04 48.485	-12 56 35.05	–	V	C57
2021-02-26 17:14:05	s	1 +62687.419	0 +345820.64	7170.0	–	C57
2021-02-26 17:24:05	S	10 04 46.615	-12 56 19.93	–	V	C57
2021-02-26 17:24:05	s	1 +62335.431	0 +346089.97	1800.0	–	C57
2021-02-26 17:44:05	S	10 04 42.854	-12 55 51.64	–	V	C57
2021-02-26 17:44:05	s	1 +61630.842	0 +346625.18	9640.0	–	C57
2021-02-26 17:54:05	S	10 04 40.966	-12 55 38.42	–	V	C57
2021-02-26 17:54:05	s	1 +61278.243	0 +346891.06	2860.0	–	C57
2021-02-26 18:04:05	S	10 04 39.055	-12 55 24.20	–	V	C57
2021-02-26 18:04:05	s	1 +60925.444	0 +347155.79	5620.0	–	C57
2021-02-26 18:14:05	S	10 04 37.126	-12 55 10.88	–	V	C57
2021-02-26 18:14:05	s	1 +60572.444	0 +347419.37	7920.0	–	C57
2021-02-26 18:24:05	S	10 04 35.237	-12 54 55.80	–	V	C57
2021-02-26 18:24:05	s	1 +60219.248	0 +347681.80	9760.0	–	C57
2021-02-26 18:34:05	S	10 04 33.348	-12 54 41.62	–	V	C57
2021-02-26 18:34:05	s	1 +59865.854	0 +347943.09	1140.0	–	C57
2021-02-26 18:44:05	S	10 04 31.464	-12 54 27.83	–	V	C57
2021-02-26 18:44:05	s	1 +59512.266	0 +348203.23	2080.0	–	C57
2021-02-26 18:54:05	S	10 04 29.568	-12 54 14.18	–	V	C57
2021-02-26 18:54:05	s	1 +59158.485	0 +348462.23	2560.0	–	C57
2021-02-26 19:04:05	S	10 04 27.643	-12 54 00.97	–	V	C57
2021-02-26 19:04:05	s	1 +58804.511	0 +348720.08	2600.0	–	C57
2021-02-26 19:14:05	S	10 04 25.742	-12 53 46.86	–	V	C57
2021-02-26 19:14:05	s	1 +58450.347	0 +348976.80	2190.0	–	C57
2021-02-26 19:24:05	S	10 04 23.851	-12 53 31.70	–	V	C57
2021-02-26 19:24:05	s	1 +58095.994	0 +349232.37	1350.0	–	C57
2021-02-26 19:34:05	S	10 04 21.982	-12 53 17.45	–	V	C57
2021-02-26 19:34:05	s	1 +57741.454	0 +349486.80	60.0	–	C57
2021-02-26 19:44:05	S	10 04 20.040	-12 53 03.77	–	V	C57
2021-02-26 19:44:05	s	1 +57386.728	0 +349740.09	8340.0	–	C57
2021-02-26 19:54:05	S	10 04 18.137	-12 52 50.23	–	V	C57
2021-02-26 19:54:05	s	1 +57031.817	0 +349992.25	6190.0	–	C57
2021-02-26 19:54:48	C	09 59 47.86	-12 51 00.1	–	V	K83
2021-02-26 19:57:33	C	09 59 47.28	-12 50 56.0	–	V	K83
2021-02-26 20:00:18	C	09 59 46.72	-12 50 51.9	–	V	K83
2021-02-26 20:04:05	S	10 04 16.236	-12 52 36.95	–	V	C57
2021-02-26 20:04:05	s	1 +56676.723	0 +350243.26	3610.0	–	C57
2021-02-26 20:14:05	S	10 04 14.282	-12 52 22.30	–	V	C57
2021-02-26 20:14:05	s	1 +56321.447	0 +350493.14	610.0	–	C57
2021-02-26 20:24:05	S	10 04 12.442	-12 52 07.46	–	V	C57
2021-02-26 20:24:05	s	1 +55965.991	0 +350741.89	7180.0	–	C57
2021-02-26 20:34:05	S	10 04 10.548	-12 51 52.63	–	V	C57
2021-02-26 20:34:05	s	1 +55610.356	0 +350989.50	3330.0	–	C57
2021-02-26 20:44:05	S	10 04 08.604	-12 51 39.35	–	V	C57
2021-02-26 20:44:05	s	1 +55254.544	0 +351235.98	9060.0	–	C57
2021-02-26 20:54:05	S	10 04 06.689	-12 51 25.78	–	V	C57
2021-02-26 20:54:05	s	1 +54898.556	0 +351481.33	4380.0	–	C57
2021-02-26 21:04:05	S	10 04 04.728	-12 51 11.95	–	V	C57

« Prev 1 2 … 132 133 134 … 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)