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
2013-02-26 18:11:52 C 06 44 18.22 +06 42 19.7 u 089
2013-02-26 18:14:31 C 06 44 18.20 +06 42 22.7 u 089
2013-02-26 18:17:10 C 06 44 18.19 +06 42 25.5 u 089
2013-02-26 18:19:49 C 06 44 18.18 +06 42 28.7 u 089
2013-02-26 18:22:28 C 06 44 18.16 +06 42 31.2 u 089
2013-02-26 18:25:07 C 06 44 18.15 +06 42 34.1 u 089
2013-02-26 18:27:46 C 06 44 18.13 +06 42 36.9 u 089
2013-02-26 18:30:25 C 06 44 18.13 +06 42 39.8 u 089
2013-02-26 18:33:04 C 06 44 18.11 +06 42 42.9 u 089
2013-02-26 18:35:43 C 06 44 18.11 +06 42 45.8 u 089
2013-02-26 18:38:22 C 06 44 18.08 +06 42 48.6 u 089
2013-02-26 18:41:01 C 06 44 18.08 +06 42 51.4 u 089
2013-02-26 18:43:40 C 06 44 18.07 +06 42 54.7 u 089
2013-02-26 18:46:19 C 06 44 18.06 +06 42 57.3 u 089
2013-02-26 18:48:58 C 06 44 18.04 +06 43 00.2 u 089
2013-02-26 18:51:37 C 06 44 18.03 +06 43 03.2 u 089
2013-02-26 19:31:28 C 06 44 18.69 +06 43 49.3 a 233
2013-02-26 19:37:25 C 06 44 18.65 +06 43 55.7 a 233
2013-02-26 19:46:54 C 06 44 18.61 +06 44 06.0 a 233
2013-02-26 19:55:23 C 06 44 18.57 +06 44 14.8 a 233
2013-02-26 20:08:07 C 06 44 18.50 +06 44 29.5 a 233
2013-02-27 12:05:32 C 06 44 25.961 +07 01 54.41 q O44
2013-02-27 12:06:47 C 06 44 25.954 +07 01 55.83 q O44
2013-02-27 12:07:13 C 06 44 25.954 +07 01 56.31 q O44
2013-02-27 12:07:39 C 06 44 25.952 +07 01 56.77 q O44
2013-02-27 12:08:07 C 06 44 25.950 +07 01 57.25 q O44
2013-02-27 12:08:33 C 06 44 25.948 +07 01 57.67 q O44
2013-02-27 12:08:58 C 06 44 25.947 +07 01 58.18 q O44
2013-02-27 12:09:26 C 06 44 25.943 +07 01 58.66 q O44
2013-02-27 12:11:12 C 06 44 25.936 +07 02 00.61 q O44
2013-02-27 12:13:28 C 06 44 25.925 +07 02 03.06 q O44
2013-02-27 12:15:45 C 06 44 25.917 +07 02 05.54 q O44
2013-02-27 12:18:03 C 06 44 25.906 +07 02 08.02 q O44
2013-02-27 12:20:19 C 06 44 25.897 +07 02 10.39 q O44
2013-02-27 12:22:36 C 06 44 25.887 +07 02 12.90 q O44
2013-02-27 12:24:54 C 06 44 25.878 +07 02 15.31 q O44
2013-02-27 12:27:10 C 06 44 25.865 +07 02 17.77 q O44
2013-02-27 12:29:26 C 06 44 25.858 +07 02 20.28 q O44
2013-02-27 12:31:43 C 06 44 25.845 +07 02 22.70 q O44
2013-02-27 12:33:59 C 06 44 25.836 +07 02 25.15 q O44
2013-02-27 12:36:17 C 06 44 25.825 +07 02 27.63 q O44
2013-02-27 12:38:33 C 06 44 25.817 +07 02 30.05 q O44
2013-02-27 20:54:31 C 06 44 28.63 +07 11 05.8 c A05
2013-02-27 21:00:44 C 06 44 28.62 +07 11 12.1 c A05
2013-02-27 21:05:44 C 06 44 28.62 +07 11 17.6 c A05
2013-02-27 21:11:18 C 06 44 28.60 +07 11 23.3 c A05
2013-02-27 21:25:44 C 06 44 28.60 +07 11 38.6 c A05
2013-02-28 02:44:14 C 06 44 32.04 +07 17 21.2 q H45
2013-02-28 02:45:59 C 06 44 32.04 +07 17 22.7 q H45
2013-02-28 02:48:46 C 06 44 32.03 +07 17 25.7 q H45
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)