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
2005-01-07 02:49:12 C 02 29 22.74 -15 15 50.7 o H06
2005-01-07 18:32:40 C 02 33 23.21 -14 34 19.0 r A30
2005-01-07 18:33:59 C 02 33 23.52 -14 34 15.3 r A30
2005-01-07 18:42:29 C 02 33 25.49 -14 33 52.7 r A30
2005-01-07 19:00:20 C 02 33 29.87 -14 33 06.3 o 151
2005-01-07 19:03:47 C 02 33 30.69 -14 32 57.7 o 151
2005-01-07 19:04:49 C 02 33 30.97 -14 32 55.7 o 151
2005-01-07 22:11:34 C 02 34 15.13 -14 24 39.8 c 587
2005-01-07 22:14:28 C 02 34 15.75 -14 24 32.5 c 587
2005-01-07 22:17:05 C 02 34 16.41 -14 24 25.5 c 587
2005-01-08 04:28:04 C 02 35 48.88 -14 08 12.5 o H06
2005-01-08 04:37:03 C 02 35 50.91 -14 07 48.8 o H06
2005-01-08 04:43:04 C 02 35 52.28 -14 07 32.9 o H06
2005-01-08 06:21:09 C 02 36 18.21 -14 03 10.7 r F60
2005-01-08 06:29:45 C 02 36 20.20 -14 02 48.8 r F60
2005-01-08 06:40:33 C 02 36 22.56 -14 02 20.6 r F60
2005-01-08 06:51:27 C 02 36 25.04 -14 01 51.9 r F60
2005-01-08 07:02:14 C 02 36 27.47 -14 01 24.1 r F60
2005-01-08 07:13:01 C 02 36 29.90 -14 00 56.6 r F60
2005-01-08 07:23:46 C 02 36 32.32 -14 00 28.2 r F60
2005-01-08 07:34:33 C 02 36 34.82 -13 59 59.4 r F60
2005-01-08 07:45:20 C 02 36 37.27 -13 59 30.9 r F60
2005-01-08 08:17:38 C 02 36 44.60 -13 58 06.5 r F60
2005-01-08 08:28:24 C 02 36 47.06 -13 57 37.5 r F60
2005-01-08 18:23:55 C 02 39 14.99 -13 32 26.5 r 952
2005-01-08 18:26:39 C 02 39 15.59 -13 32 19.9 r 952
2005-01-08 18:29:21 C 02 39 16.20 -13 32 12.8 r 952
2005-01-08 18:32:04 C 02 39 16.82 -13 32 05.8 r 952
2005-01-10 18:13:01 C 02 50 14.28 -11 34 02.1 c A62
2005-01-10 18:13:36 C 02 50 14.41 -11 34 01.0 c A62
2005-01-10 18:14:27 C 02 50 14.59 -11 33 58.9 c A62
2005-01-10 18:15:02 C 02 50 14.73 -11 33 57.6 c A62
2005-01-10 18:15:35 C 02 50 14.84 -11 33 56.6 c A62
2005-01-10 18:15:52 C 02 50 14.91 -11 33 55.8 c A62
2005-01-10 18:16:43 C 02 50 15.09 -11 33 53.5 c A62
2005-01-10 18:17:17 C 02 50 15.20 -11 33 52.0 c A62
2005-01-10 18:17:30 C 02 50 15.32 -11 33 50.9 o 151
2005-01-10 18:17:52 C 02 50 15.32 -11 33 50.5 c A62
2005-01-10 18:18:25 C 02 50 15.44 -11 33 49.0 c A62
2005-01-10 18:19:09 C 02 50 15.57 -11 33 47.6 c A62
2005-01-10 18:20:30 C 02 50 16.04 -11 33 42.9 r A13
2005-01-10 18:20:38 C 02 50 15.90 -11 33 44.4 c A62
2005-01-10 18:21:22 C 02 50 16.01 -11 33 42.1 c A62
2005-01-10 18:22:06 C 02 50 16.19 -11 33 40.7 c A62
2005-01-10 18:22:26 C 02 50 16.34 -11 33 39.2 o 151
2005-01-10 18:22:50 C 02 50 16.35 -11 33 38.8 c A62
2005-01-10 18:23:23 C 02 50 16.46 -11 33 37.5 c A62
2005-01-10 18:23:57 C 02 50 16.58 -11 33 36.5 c A62
2005-01-10 18:24:23 C 02 50 16.73 -11 33 34.4 o 151
2005-01-10 18:24:32 C 02 50 16.68 -11 33 35.0 c A62
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)