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
2005-01-10 18:25:05 C 02 50 16.79 -11 33 33.5 c A62
2005-01-10 18:25:49 C 02 50 17.14 -11 33 30.1 r A13
2005-01-10 18:26:49 C 02 50 17.15 -11 33 29.5 c A62
2005-01-10 18:27:29 C 02 50 17.29 -11 33 27.7 c A62
2005-01-10 18:28:09 C 02 50 17.42 -11 33 26.0 c A62
2005-01-10 18:28:50 C 02 50 17.58 -11 33 24.4 c A62
2005-01-10 18:29:30 C 02 50 17.71 -11 33 22.9 c A62
2005-01-10 18:30:10 C 02 50 17.85 -11 33 21.0 c A62
2005-01-10 18:30:51 C 02 50 17.99 -11 33 19.6 c A62
2005-01-10 18:31:24 C 02 50 18.29 -11 33 16.8 r A13
2005-01-10 18:31:31 C 02 50 18.15 -11 33 18.1 c A62
2005-01-10 18:32:11 C 02 50 18.27 -11 33 16.3 c A62
2005-01-10 18:32:51 C 02 50 18.42 -11 33 15.0 c A62
2005-01-10 18:33:32 C 02 50 18.58 -11 33 13.2 c A62
2005-01-10 18:34:05 C 02 50 18.68 -11 33 11.8 c A62
2005-01-10 18:34:40 C 02 50 18.80 -11 33 10.5 c A62
2005-01-10 18:35:14 C 02 50 18.92 -11 33 09.1 c A62
2005-01-10 18:35:47 C 02 50 19.02 -11 33 07.6 c A62
2005-01-10 18:36:22 C 02 50 19.14 -11 33 06.0 c A62
2005-01-10 18:36:39 C 02 50 19.20 -11 33 05.3 c A62
2005-01-10 18:36:56 C 02 50 19.26 -11 33 04.9 c A62
2005-01-10 18:37:13 C 02 50 19.34 -11 33 04.7 c A62
2005-01-10 18:37:30 C 02 50 19.39 -11 33 03.5 c A62
2005-01-10 23:41:52 C 02 51 24.58 -11 19 48.9 r I77
2005-01-10 23:43:05 C 02 51 24.87 -11 19 43.7 r I77
2005-01-10 23:43:43 C 02 51 25.10 -11 19 42.4 r I77
2005-01-11 02:18:48 C 02 52 00.86 -11 14 27.2 r 701
2005-01-11 03:03:38 C 02 52 09.80 -11 12 41.3 r 701
2005-01-11 05:35:13 C 02 52 43.57 -11 06 31.2 r F60
2005-01-11 05:49:43 C 02 52 46.18 -11 05 58.9 r F60
2005-01-11 06:05:56 C 02 52 49.41 -11 05 20.2 r F60
2005-01-11 06:22:02 C 02 52 52.59 -11 04 41.6 r F60
2005-01-11 06:54:39 C 02 52 59.05 -11 03 24.4 r F60
2005-01-11 07:10:55 C 02 53 02.29 -11 02 45.7 r F60
2005-01-11 07:27:34 C 02 53 05.64 -11 02 05.9 r F60
2005-01-11 08:03:47 C 02 53 12.83 -11 00 39.9 r F60
2005-01-11 10:21:19 C 02 53 43.67 -10 54 16.0 r 423
2005-01-11 10:43:31 C 02 53 48.06 -10 53 23.4 r 423
2005-01-11 10:48:31 C 02 53 49.06 -10 53 11.6 r 423
2005-01-11 10:56:30 C 02 53 50.62 -10 52 52.8 r 423
2005-01-11 12:36:59 C 02 54 10.87 -10 48 55.1 r E17
2005-01-11 12:39:35 C 02 54 11.37 -10 48 49.0 r E17
2005-01-11 12:42:09 C 02 54 11.82 -10 48 42.9 r E17
2005-01-11 19:07:34 C 02 55 36.65 -10 35 05.3 r 201
2005-01-11 19:09:39 C 02 55 37.04 -10 35 00.5 r 201
2005-01-11 19:14:04 C 02 55 37.94 -10 34 50.3 r 201
2005-01-11 19:15:09 C 02 55 38.13 -10 34 47.6 r 201
2005-01-11 21:36:13 C 02 56 06.25 -10 29 18.4 r A13
2005-01-11 21:43:14 C 02 56 07.67 -10 29 02.2 r A13
2005-01-11 21:59:19 C 02 56 10.91 -10 28 24.5 r A13
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)