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
2013-02-06 16:13:05 C 07 03 20.887 -04 52 40.51 q O44
2013-02-06 16:13:56 C 07 03 20.792 -04 52 38.87 q O44
2013-02-06 16:19:00 C 07 03 20.220 -04 52 29.80 q O44
2013-02-06 17:20:26 C 07 03 13.329 -04 50 38.09 q O44
2013-02-06 17:21:36 C 07 03 13.200 -04 50 35.96 q O44
2013-02-06 17:23:44 C 07 03 12.965 -04 50 32.11 q O44
2013-02-06 17:24:38 C 07 03 12.864 -04 50 30.46 q O44
2013-02-06 17:25:33 C 07 03 12.765 -04 50 28.86 q O44
2013-02-06 17:26:20 C 07 03 12.673 -04 50 27.30 q O44
2013-02-06 17:33:07 C 07 03 11.925 -04 50 14.96 q O44
2013-02-06 17:34:06 C 07 03 11.815 -04 50 13.19 q O44
2013-02-06 17:34:57 C 07 03 11.720 -04 50 11.67 q O44
2013-02-06 17:35:47 C 07 03 11.627 -04 50 10.14 q O44
2013-02-06 17:36:34 C 07 03 11.548 -04 50 08.77 q O44
2013-02-06 17:42:25 C 07 03 10.905 -04 49 58.10 q O44
2013-02-06 17:43:17 C 07 03 10.807 -04 49 56.51 q O44
2013-02-06 17:44:13 C 07 03 10.701 -04 49 54.89 q O44
2013-02-06 17:52:22 C 07 03 09.815 -04 49 40.02 q O44
2013-02-06 17:53:21 C 07 03 09.704 -04 49 38.20 q O44
2013-02-06 17:54:16 C 07 03 09.609 -04 49 36.50 q O44
2013-02-06 17:55:04 C 07 03 09.519 -04 49 35.12 q O44
2013-02-06 17:56:06 C 07 03 09.404 -04 49 33.15 q O44
2013-02-06 17:56:53 C 07 03 09.324 -04 49 31.68 q O44
2013-02-06 17:57:46 C 07 03 09.228 -04 49 30.05 q O44
2013-02-06 17:59:21 C 07 03 08.47 -04 48 20.6 u D20
2013-02-06 17:59:47 C 07 03 08.42 -04 48 19.7 u D20
2013-02-06 18:00:14 C 07 03 08.38 -04 48 18.9 u D20
2013-02-06 18:07:16 C 07 03 12.30 -04 49 30.2 q B17
2013-02-06 18:17:11 C 07 03 11.88 -04 49 15.1 u 557
2013-02-06 18:27:25 C 07 03 10.81 -04 48 57.7 o 639
2013-02-06 18:30:56 C 07 03 09.71 -04 48 47.8 q B17
2013-02-06 18:44:45 C 07 03 09.00 -04 48 26.4 o 639
2013-02-06 18:59:50 C 07 03 06.56 -04 47 55.6 q B17
2013-02-06 19:22:03 C 07 03 04.14 -04 47 15.5 q B17
2013-02-06 19:31:59 C 07 03 03.93 -04 47 00.6 u 557
2013-02-06 19:42:23 C 07 03 02.86 -04 46 42.8 o 639
2013-02-06 19:48:36 C 07 03 02.19 -04 46 31.7 o 639
2013-02-06 19:53:30 C 07 03 00.72 -04 46 18.6 q B17
2013-02-06 20:17:30 C 07 02 58.09 -04 45 35.6 q B17
2013-02-06 20:49:17 C 07 02 55.63 -04 44 41.5 u 557
2013-02-06 21:16:41 C 07 02 52.71 -04 43 52.4 u 557
2013-02-06 22:49:22 C 07 02 42.85 -04 41 05.0 u 557
2013-02-06 23:32:00 C 07 02 38.37 -04 39 48.0 u 557
2013-02-07 13:54:27 C 07 01 22.241 -04 13 45.16 q O44
2013-02-07 13:55:41 C 07 01 22.111 -04 13 42.98 q O44
2013-02-07 13:58:30 C 07 01 21.809 -04 13 38.02 q O44
2013-02-07 13:59:22 C 07 01 21.720 -04 13 36.57 q O44
2013-02-07 13:59:38 C 07 01 20.61 -04 12 31.5 u D20
2013-02-07 14:00:04 C 07 01 20.55 -04 12 30.8 u D20
2013-02-07 14:00:14 C 07 01 21.624 -04 13 34.93 q O44
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)