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
2013-03-03 03:08:13 C 06 45 32.24 +08 30 25.9 q H45
2013-03-03 03:10:15 C 06 45 32.26 +08 30 27.7 q H45
2013-03-03 03:11:56 C 06 45 32.28 +08 30 29.6 q H45
2013-03-03 03:13:28 C 06 45 32.29 +08 30 31.1 q H45
2013-03-03 18:41:11 C 06 45 51.10 +08 45 15.0 c A24
2013-03-03 18:42:13 C 06 45 51.20 +08 45 14.6 c A24
2013-03-04 07:32:09 C 06 46 06.116 +08 57 38.77 t F65
2013-03-04 07:33:25 C 06 46 06.132 +08 57 40.00 t F65
2013-03-04 07:34:43 C 06 46 06.139 +08 57 41.26 t F65
2013-03-04 07:35:56 C 06 46 06.158 +08 57 42.26 t F65
2013-03-04 07:37:10 C 06 46 06.180 +08 57 43.51 t F65
2013-03-04 12:53:05 C 06 46 12.93 +09 02 27.6 o 300
2013-03-04 12:56:26 C 06 46 12.91 +09 02 31.0 o 300
2013-03-04 12:59:46 C 06 46 12.97 +09 02 34.4 o 300
2013-03-04 13:03:07 C 06 46 13.03 +09 02 37.2 o 300
2013-03-04 13:06:28 C 06 46 13.06 +09 02 40.3 o 300
2013-03-04 13:09:48 C 06 46 13.13 +09 02 43.6 o 300
2013-03-04 13:13:08 C 06 46 13.16 +09 02 46.4 o 300
2013-03-04 13:16:28 C 06 46 13.21 +09 02 49.5 o 300
2013-03-04 13:19:49 C 06 46 13.30 +09 02 53.0 o 300
2013-03-04 18:26:09 C 06 46 21.79 +09 07 27.5 u C01
2013-03-04 18:31:35 C 06 46 21.86 +09 07 32.0 u C01
2013-03-04 18:36:59 C 06 46 21.95 +09 07 37.7 u C01
2013-03-04 18:42:21 C 06 46 22.02 +09 07 42.9 u C01
2013-03-04 18:47:45 C 06 46 22.11 +09 07 47.8 u C01
2013-03-04 19:25:58 C 06 46 22.80 +09 08 28.2 a 233
2013-03-04 19:33:52 C 06 46 22.95 +09 08 35.8 a 233
2013-03-04 19:41:55 C 06 46 23.01 +09 08 42.6 a 233
2013-03-04 19:47:16 C 06 46 23.15 +09 08 45.9 c A24
2013-03-04 19:48:19 C 06 46 23.17 +09 08 47.1 c A24
2013-03-04 20:07:04 C 06 46 23.43 +09 09 04.3 c A24
2013-03-04 20:11:34 C 06 46 23.38 +09 09 04.7 u C01
2013-03-04 20:16:58 C 06 46 23.46 +09 09 10.2 u C01
2013-03-04 20:22:20 C 06 46 23.52 +09 09 14.5 u C01
2013-03-04 20:26:52 C 06 46 23.71 +09 09 22.6 c A24
2013-03-04 20:26:59 C 06 46 23.66 +09 09 23.5 i C91
2013-03-04 20:27:44 C 06 46 23.60 +09 09 19.2 u C01
2013-03-04 20:32:00 C 06 46 23.73 +09 09 27.9 i C91
2013-03-04 20:37:59 C 06 46 23.79 +09 09 32.4 i C91
2013-03-04 20:45:38 C 06 46 23.94 +09 09 39.7 c A24
2013-03-04 20:46:40 C 06 46 23.99 +09 09 41.0 c A24
2013-03-04 21:06:27 C 06 46 24.23 +09 09 58.5 c A48
2013-03-04 21:10:34 C 06 46 24.30 +09 10 02.4 c A48
2013-03-04 21:14:40 C 06 46 24.36 +09 10 05.8 c A48
2013-03-04 21:18:46 C 06 46 24.41 +09 10 09.7 c A48
2013-03-05 03:08:05 C 06 46 33.09 +09 15 37.9 q H45
2013-03-05 03:11:45 C 06 46 33.13 +09 15 41.1 q H45
2013-03-05 03:18:05 C 06 46 33.24 +09 15 46.8 q H45
2013-03-05 03:22:24 C 06 46 33.28 +09 15 51.0 q H45
2013-03-05 03:25:18 C 06 46 33.33 +09 15 53.1 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)