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
2006-11-28 14:40:55 C 12 23 27.455 -05 33 44.13 L 568
2006-11-28 14:44:18 C 12 23 27.900 -05 33 47.02 L 568
2006-11-28 14:47:40 C 12 23 28.333 -05 33 49.76 L 568
2006-11-28 14:51:05 C 12 23 28.750 -05 33 52.52 L 568
2006-11-28 14:54:33 C 12 23 29.200 -05 33 55.26 L 568
2006-11-28 15:00:08 C 12 23 29.918 -05 33 59.86 L 568
2006-11-28 15:03:31 C 12 23 30.356 -05 34 02.67 L 568
2006-11-28 15:06:55 C 12 23 30.783 -05 34 05.39 L 568
2006-11-28 15:10:30 C 12 23 31.243 -05 34 08.35 L 568
2006-11-28 15:13:52 C 12 23 31.694 -05 34 11.18 L 568
2006-11-28 15:17:16 C 12 23 32.122 -05 34 13.96 L 568
2006-11-28 15:20:43 C 12 23 32.559 -05 34 16.72 L 568
2006-11-28 15:24:21 C 12 23 33.023 -05 34 19.79 L 568
2006-11-28 15:32:50 C 12 23 34.102 -05 34 26.64 L 568
2006-12-25 14:46:48 C 13 51 22.763 -13 59 56.70 L 568
2006-12-25 14:49:41 C 13 51 23.174 -13 59 58.77 L 568
2006-12-25 14:52:46 C 13 51 23.614 -14 00 01.00 L 568
2006-12-25 14:55:51 C 13 51 24.048 -14 00 03.19 L 568
2006-12-25 14:58:56 C 13 51 24.483 -14 00 05.46 L 568
2006-12-25 15:01:48 C 13 51 24.897 -14 00 07.57 L 568
2006-12-25 15:04:41 C 13 51 25.303 -14 00 09.63 L 568
2006-12-25 15:07:35 C 13 51 25.727 -14 00 11.91 L 568
2006-12-25 15:10:27 C 13 51 26.111 -14 00 13.98 L 568
2006-12-25 15:13:25 C 13 51 26.550 -14 00 16.10 L 568
2006-12-25 15:16:19 C 13 51 26.944 -14 00 18.32 L 568
2006-12-25 15:19:22 C 13 51 27.397 -14 00 20.54 L 568
2006-12-25 15:22:16 C 13 51 27.795 -14 00 22.50 L 568
2006-12-25 15:25:20 C 13 51 28.243 -14 00 24.79 L 568
2006-12-25 15:28:12 C 13 51 28.632 -14 00 26.91 L 568
2006-12-25 15:31:05 C 13 51 29.049 -14 00 28.99 L 568
2006-12-25 15:33:58 C 13 51 29.453 -14 00 31.11 L 568
2006-12-25 15:37:02 C 13 51 29.887 -14 00 33.30 L 568
2006-12-25 15:40:00 C 13 51 30.308 -14 00 35.48 L 568
2006-12-25 15:42:52 C 13 51 30.727 -14 00 37.66 L 568
2006-12-26 14:51:45 C 13 54 51.077 -14 17 22.37 L 568
2006-12-26 14:55:29 C 13 54 51.617 -14 17 25.10 L 568
2006-12-26 14:59:11 C 13 54 52.140 -14 17 27.76 L 568
2006-12-26 15:02:54 C 13 54 52.676 -14 17 30.47 L 568
2006-12-26 15:06:36 C 13 54 53.203 -14 17 33.18 L 568
2006-12-26 15:10:32 C 13 54 53.784 -14 17 36.02 L 568
2006-12-26 15:14:14 C 13 54 54.277 -14 17 38.64 L 568
2006-12-26 15:17:56 C 13 54 54.814 -14 17 41.38 L 568
2006-12-26 15:21:39 C 13 54 55.344 -14 17 44.03 L 568
2006-12-26 15:27:59 C 13 54 56.257 -14 17 48.70 L 568
2006-12-26 15:31:42 C 13 54 56.800 -14 17 51.38 L 568
2006-12-26 15:35:25 C 13 54 57.317 -14 17 54.00 L 568
2006-12-26 15:39:22 C 13 54 57.885 -14 17 56.94 L 568
2006-12-26 15:43:04 C 13 54 58.410 -14 17 59.59 L 568
2006-12-26 15:47:00 C 13 54 58.975 -14 18 02.42 L 568
2006-12-26 15:50:42 C 13 54 59.492 -14 18 05.09 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)