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
2005-02-07 18:39:35 C 04 31 38.78 +06 19 37.4 o 198
2005-02-07 18:47:59 C 04 31 39.68 +06 19 46.2 o 198
2005-02-07 19:02:36 C 04 31 41.11 +06 20 02.6 c A41
2005-02-07 19:44:29 C 04 31 45.65 +06 20 45.6 c A41
2005-02-07 20:08:58 C 04 31 48.37 +06 21 08.1 r 557
2005-02-07 20:11:22 C 04 31 48.61 +06 21 10.2 r 557
2005-02-07 20:13:45 C 04 31 48.85 +06 21 13.1 r 557
2005-02-08 19:06:23 C 04 34 27.75 +06 44 32.0 r 201
2005-02-08 19:17:31 C 04 34 28.95 +06 44 43.3 r 201
2005-02-08 19:20:16 C 04 34 29.54 +06 44 43.8 r J95
2005-02-08 19:28:41 C 04 34 30.14 +06 44 54.0 r 201
2005-02-08 19:32:20 C 04 34 30.83 +06 44 55.6 r J95
2005-02-08 19:42:14 C 04 34 31.91 +06 45 05.5 r J95
2005-02-09 17:53:32 C 04 37 04.24 +07 07 03.5 o 084
2005-02-09 17:58:10 C 04 37 04.74 +07 07 07.8 o 084
2005-02-09 18:25:28 C 04 37 08.22 +07 07 40.9 r 151
2005-02-09 18:31:18 C 04 37 08.82 +07 07 46.3 r 151
2005-02-09 18:33:44 C 04 37 09.06 +07 07 48.4 r 151
2005-02-09 21:00:59 C 04 37 24.82 +07 10 13.6 c A53
2005-02-09 21:13:20 C 04 37 26.01 +07 10 23.6 c A53
2005-02-09 21:34:40 C 04 37 28.42 +07 10 44.5 c A53
2005-02-09 23:22:04 C 04 37 40.27 +07 12 27.9 c 587
2005-02-09 23:25:41 C 04 37 40.69 +07 12 32.6 c 587
2005-02-09 23:29:17 C 04 37 41.05 +07 12 34.7 c 587
2005-02-10 16:12:57 C 04 39 37.11 +07 28 41.0 o 084
2005-02-11 03:00:17 C 04 40 49.46 +07 39 06.0 r 734
2005-02-11 03:05:00 C 04 40 49.95 +07 39 10.9 r 734
2005-02-11 03:10:08 C 04 40 50.47 +07 39 15.5 r 734
2005-02-11 19:23:28 C 04 42 40.99 +07 54 28.1 r 941
2005-02-11 19:26:07 C 04 42 41.27 +07 54 30.6 r 941
2005-02-11 19:28:06 C 04 42 41.47 +07 54 32.5 r 941
2005-02-11 19:30:06 C 04 42 41.68 +07 54 34.4 r 941
2005-02-11 19:32:06 C 04 42 41.90 +07 54 36.3 r 941
2005-02-12 02:29:25 C 04 43 28.45 +08 01 05.2 r H41
2005-02-12 02:34:22 C 04 43 28.96 +08 01 09.6 r H41
2005-02-12 02:36:48 C 04 43 29.20 +08 01 11.5 r H41
2005-02-12 02:39:33 C 04 43 29.49 +08 01 14.2 r H41
2005-02-12 03:21:08 C 04 43 33.94 +08 01 50.4 r 649
2005-02-12 03:23:41 C 04 43 34.21 +08 01 52.8 r 649
2005-02-12 03:26:15 C 04 43 34.47 +08 01 55.1 r 649
2005-02-16 04:49:29 C 04 54 24.18 +09 27 07.7 r H36
2005-02-16 05:04:45 C 04 54 25.79 +09 27 19.8 r H36
2005-02-18 20:14:05 C 05 01 22.28 +10 18 03.3 c 213
2005-02-18 20:15:54 C 05 01 22.45 +10 18 04.7 c 213
2005-02-18 20:19:32 C 05 01 22.80 +10 18 07.4 c 213
2005-02-20 19:30:43 C 05 06 31.20 +10 53 43.3 r A68
2005-02-20 19:36:01 C 05 06 31.76 +10 53 47.6 r A68
2005-02-20 19:41:24 C 05 06 32.34 +10 53 51.3 r A68
2005-02-22 01:16:35 C 05 09 44.96 +11 15 29.4 r H45
2005-02-22 01:19:42 C 05 09 45.26 +11 15 31.0 r 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)