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
2006-03-06 13:56:06 C 16 25 56.956 -26 39 26.69 L 568
2006-03-06 13:58:27 C 16 25 57.429 -26 39 27.19 L 568
2006-03-06 14:00:49 C 16 25 57.889 -26 39 27.56 L 568
2006-03-06 14:03:20 C 16 25 58.403 -26 39 28.25 L 568
2006-03-06 14:05:42 C 16 25 58.884 -26 39 28.74 L 568
2006-03-06 14:08:04 C 16 25 59.356 -26 39 29.24 L 568
2006-03-06 14:10:37 C 16 25 59.860 -26 39 29.79 L 568
2006-03-06 14:13:03 C 16 26 00.342 -26 39 30.29 L 568
2006-03-06 14:15:36 C 16 26 00.854 -26 39 30.79 L 568
2006-03-06 14:17:58 C 16 26 01.332 -26 39 31.30 L 568
2006-03-06 14:23:48 C 16 26 02.494 -26 39 32.45 L 568
2006-03-06 14:26:18 C 16 26 02.993 -26 39 33.01 L 568
2006-03-06 14:28:39 C 16 26 03.457 -26 39 33.48 L 568
2006-03-06 14:31:01 C 16 26 03.930 -26 39 34.00 L 568
2006-03-06 14:33:26 C 16 26 04.414 -26 39 34.45 L 568
2006-03-06 14:35:48 C 16 26 04.891 -26 39 34.94 L 568
2006-03-06 14:38:19 C 16 26 05.388 -26 39 35.44 L 568
2006-03-06 14:40:43 C 16 26 05.870 -26 39 35.93 L 568
2006-03-06 14:43:18 C 16 26 06.381 -26 39 36.46 L 568
2006-03-06 14:45:55 C 16 26 06.900 -26 39 36.96 L 568
2006-03-06 14:49:37 C 16 26 07.648 -26 39 37.74 L 568
2006-03-06 14:52:00 C 16 26 08.129 -26 39 38.22 L 568
2006-03-06 14:54:21 C 16 26 08.593 -26 39 38.68 L 568
2006-03-06 14:56:56 C 16 26 09.105 -26 39 39.17 L 568
2006-03-06 14:59:20 C 16 26 09.584 -26 39 39.65 L 568
2006-03-06 15:01:56 C 16 26 10.112 -26 39 40.15 L 568
2006-03-06 15:06:39 C 16 26 11.039 -26 39 41.09 L 568
2006-03-06 15:09:10 C 16 26 11.530 -26 39 41.57 L 568
2006-03-06 15:11:33 C 16 26 12.016 -26 39 42.05 L 568
2006-03-06 15:14:25 C 16 26 12.589 -26 39 42.58 L 568
2006-03-06 15:19:09 C 16 26 13.532 -26 39 43.51 L 568
2006-03-06 15:21:34 C 16 26 14.033 -26 39 43.93 L 568
2006-03-06 15:24:09 C 16 26 14.532 -26 39 44.44 L 568
2006-03-06 15:26:32 C 16 26 15.007 -26 39 44.91 L 568
2006-03-06 15:29:07 C 16 26 15.513 -26 39 45.40 L 568
2006-03-06 15:31:31 C 16 26 16.000 -26 39 45.85 L 568
2006-03-06 15:34:07 C 16 26 16.534 -26 39 46.31 L 568
2006-03-06 15:36:28 C 16 26 16.985 -26 39 46.76 L 568
2006-03-08 12:35:17 C 16 35 51.633 -26 46 44.58 L 568
2006-03-08 12:37:38 C 16 35 52.139 -26 46 45.02 L 568
2006-03-08 12:40:00 C 16 35 52.632 -26 46 45.44 L 568
2006-03-08 12:42:20 C 16 35 53.122 -26 46 45.81 L 568
2006-03-08 12:44:54 C 16 35 53.668 -26 46 46.23 L 568
2006-03-08 12:47:16 C 16 35 54.145 -26 46 46.74 L 568
2006-03-08 12:49:37 C 16 35 54.645 -26 46 47.05 L 568
2006-03-08 12:52:09 C 16 35 55.161 -26 46 47.51 L 568
2006-03-08 12:56:54 C 16 35 56.166 -26 46 48.34 L 568
2006-03-08 13:09:26 C 16 35 58.785 -26 46 50.43 L 568
2006-03-08 13:11:48 C 16 35 59.291 -26 46 50.85 L 568
2006-03-08 13:14:10 C 16 35 59.779 -26 46 51.19 L 568
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)