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 Period0.88586012 yr ± 4.32e+00
NGA Modelr2
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
SourceIAA
Solution Date2026-04-29
RMS Residual0.213″
Uncertainty0
Orbit TypeAten
MOID0.000007 AU
Observations Used8720
Oppositions2
Arc Total2004-2021
First Observation Used2004-03-15
Last Observation Used2021-05-20
Observations (10797)
Date Type RA Dec Mag Band Observatory
2013-01-19 22:15:12 C 08 11 00.13 -18 36 57.5 o 071
2013-01-19 22:16:28 C 08 10 59.80 -18 36 55.2 o 071
2013-01-19 22:17:33 C 08 10 59.55 -18 36 53.7 o 071
2013-01-19 22:18:50 C 08 10 59.26 -18 36 51.2 o 071
2013-01-19 22:19:54 C 08 10 58.94 -18 36 49.4 o 071
2013-01-19 22:21:11 C 08 10 58.68 -18 36 46.9 o 071
2013-01-19 22:22:15 C 08 10 58.43 -18 36 44.8 o 071
2013-01-19 22:23:32 C 08 10 58.13 -18 36 42.7 o 071
2013-01-19 22:24:36 C 08 10 57.85 -18 36 40.9 o 071
2013-01-19 22:25:52 C 08 10 57.57 -18 36 38.4 o 071
2013-01-19 22:26:57 C 08 10 57.32 -18 36 36.5 o 071
2013-01-19 22:28:13 C 08 10 57.00 -18 36 34.1 o 071
2013-01-19 22:29:18 C 08 10 56.74 -18 36 32.4 o 071
2013-01-19 22:30:33 C 08 10 56.42 -18 36 30.0 o 071
2013-01-19 22:31:39 C 08 10 56.12 -18 36 28.1 o 071
2013-01-19 22:32:55 C 08 10 55.91 -18 36 26.1 o 071
2013-01-19 22:35:16 C 08 10 55.23 -18 36 21.9 o 071
2013-01-19 22:36:24 C 08 10 55.09 -18 36 19.5 o 071
2013-01-19 22:37:41 C 08 10 54.74 -18 36 16.9 o 071
2013-01-19 22:38:46 C 08 10 54.56 -18 36 15.5 o 071
2013-01-19 22:40:02 C 08 10 54.22 -18 36 13.3 o 071
2013-01-19 22:42:23 C 08 10 53.59 -18 36 08.5 o 071
2013-01-19 22:43:28 C 08 10 53.32 -18 36 06.5 o 071
2013-01-19 22:44:43 C 08 10 53.04 -18 36 04.1 o 071
2013-01-19 22:45:49 C 08 10 52.78 -18 36 02.3 o 071
2013-01-19 22:47:04 C 08 10 52.49 -18 36 00.0 o 071
2013-01-19 22:48:10 C 08 10 52.22 -18 35 58.0 o 071
2013-01-19 22:49:27 C 08 10 51.93 -18 35 55.7 o 071
2013-01-19 22:50:31 C 08 10 51.68 -18 35 53.9 o 071
2013-01-19 22:51:48 C 08 10 51.37 -18 35 51.3 o 071
2013-01-19 22:52:52 C 08 10 51.12 -18 35 49.7 o 071
2013-01-19 22:54:08 C 08 10 50.80 -18 35 47.1 o 071
2013-01-19 22:55:13 C 08 10 50.55 -18 35 44.8 o 071
2013-01-19 22:56:29 C 08 10 50.28 -18 35 41.1 o 071
2013-01-19 22:57:34 C 08 10 50.00 -18 35 41.7 o 071
2013-01-19 22:58:52 C 08 10 49.70 -18 35 38.7 o 071
2013-01-19 23:00:14 C 08 10 49.41 -18 35 36.2 o 071
2013-01-19 23:01:30 C 08 10 49.04 -18 35 33.6 o 071
2013-01-19 23:02:35 C 08 10 48.86 -18 35 32.8 o 071
2013-01-19 23:03:51 C 08 10 48.50 -18 35 29.7 o 071
2013-01-19 23:04:56 C 08 10 48.22 -18 35 27.7 o 071
2013-01-19 23:06:12 C 08 10 47.91 -18 35 25.1 o 071
2013-01-19 23:07:17 C 08 10 47.72 -18 35 23.4 o 071
2013-01-19 23:08:32 C 08 10 47.35 -18 35 20.7 o 071
2013-01-19 23:09:38 C 08 10 47.12 -18 35 18.3 o 071
2013-01-19 23:10:53 C 08 10 46.81 -18 35 16.5 o 071
2013-01-19 23:11:59 C 08 10 46.49 -18 35 14.5 o 071
2013-01-19 23:13:14 C 08 10 46.23 -18 35 12.3 o 071
2013-01-19 23:14:20 C 08 10 45.96 -18 35 10.8 o 071
2013-01-19 23:15:36 C 08 10 45.67 -18 35 08.0 o 071
Radar Observations (50)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
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)