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
2005-01-04 18:34:27 C 02 14 03.48 -17 51 04.4 r A13
2005-01-04 18:38:57 C 02 14 04.70 -17 50 51.8 r A13
2005-01-04 18:43:24 C 02 14 05.91 -17 50 39.2 r A13
2005-01-04 19:09:30 C 02 14 13.01 -17 49 24.9 r A13
2005-01-04 19:14:26 C 02 14 14.34 -17 49 11.0 r A13
2005-01-04 21:29:52 C 02 14 51.17 -17 42 44.3 r 215
2005-01-04 21:30:16 C 02 14 51.22 -17 42 42.4 r 215
2005-01-04 21:31:01 C 02 14 51.44 -17 42 41.2 r 215
2005-01-04 21:31:24 C 02 14 51.50 -17 42 39.1 r 215
2005-01-05 10:55:04 C 02 18 39.15 -17 03 34.3 r 423
2005-01-05 10:59:04 C 02 18 40.25 -17 03 23.4 r 423
2005-01-05 11:15:04 C 02 18 44.44 -17 02 38.0 r 423
2005-01-05 11:20:04 C 02 18 45.75 -17 02 23.7 r 423
2005-01-05 18:21:38 C 02 20 45.68 -16 44 18.0 r 941
2005-01-05 18:22:14 C 02 20 45.82 -16 44 16.3 r 941
2005-01-05 18:26:34 C 02 20 46.93 -16 44 04.7 r 941
2005-01-05 18:28:37 C 02 20 47.47 -16 43 58.8 r 941
2005-01-06 01:56:15 C 02 22 49.06 -16 23 18.9 o H06
2005-01-06 02:02:11 C 02 22 50.59 -16 23 02.7 o H06
2005-01-06 02:07:30 C 02 22 51.93 -16 22 47.7 o H06
2005-01-06 10:25:26 C 02 25 04.02 -15 58 47.0 r 423
2005-01-06 10:39:12 C 02 25 07.48 -15 58 09.1 r 423
2005-01-06 10:59:12 C 02 25 12.47 -15 57 14.2 r 423
2005-01-06 11:05:27 C 02 25 14.01 -15 56 56.9 r 423
2005-01-06 17:11:29 C 02 26 53.74 -15 41 53.6 c 046
2005-01-06 17:12:33 C 02 26 54.03 -15 41 50.8 c 046
2005-01-06 17:13:29 C 02 26 54.26 -15 41 48.3 c 046
2005-01-06 17:16:24 C 02 26 54.98 -15 41 40.2 c 046
2005-01-06 17:20:06 C 02 26 55.90 -15 41 30.5 c 046
2005-01-06 17:33:59 C 02 26 59.71 -15 40 51.7 17.0 r 130
2005-01-06 17:36:54 C 02 27 00.39 -15 40 44.3 17.4 r 130
2005-01-06 17:38:21 C 02 27 00.76 -15 40 40.0 17.1 r 130
2005-01-06 17:40:31 C 02 27 01.27 -15 40 33.5 17.1 r 130
2005-01-06 17:50:28 C 02 27 04.52 -15 40 01.0 r 952
2005-01-06 17:55:53 C 02 27 05.86 -15 39 46.8 r 952
2005-01-06 17:57:23 C 02 27 05.47 -15 39 49.9 c A62
2005-01-06 17:57:59 C 02 27 05.56 -15 39 45.5 c 104
2005-01-06 17:59:34 C 02 27 05.97 -15 39 41.2 c 104
2005-01-06 18:01:18 C 02 27 07.20 -15 39 32.4 r 952
2005-01-06 18:01:24 C 02 27 06.41 -15 39 36.2 c 104
2005-01-06 18:02:15 C 02 27 06.72 -15 39 37.0 c A62
2005-01-06 18:06:44 C 02 27 08.52 -15 39 17.7 r 952
2005-01-06 18:07:07 C 02 27 07.87 -15 39 23.9 c A62
2005-01-06 18:08:05 C 02 27 08.86 -15 39 14.0 r 952
2005-01-07 01:35:06 C 02 29 04.03 -15 19 10.5 r H41
2005-01-07 01:40:42 C 02 29 05.29 -15 18 56.0 r H41
2005-01-07 01:43:11 C 02 29 05.93 -15 18 48.1 r H41
2005-01-07 01:45:58 C 02 29 06.65 -15 18 41.0 r H41
2005-01-07 02:29:36 C 02 29 17.99 -15 16 42.5 o H06
2005-01-07 02:35:31 C 02 29 19.45 -15 16 26.8 o H06
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)