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
2004-12-26 16:51:10 C 00 55 08.57 -28 43 57.4 18.2 c 097
2004-12-26 16:53:38 C 00 55 09.62 -28 43 50.3 18.7 c 097
2004-12-26 16:54:40 C 00 55 10.04 -28 43 46.6 17.9 c 097
2004-12-26 16:55:48 C 00 55 10.51 -28 43 43.7 18.1 c 097
2004-12-26 16:56:52 C 00 55 10.93 -28 43 40.1 18.5 c 097
2004-12-26 17:00:00 C 00 55 12.27 -28 43 31.0 18.1 c 097
2004-12-26 17:02:45 C 00 55 13.44 -28 43 22.6 18.1 c 097
2004-12-26 17:03:48 C 00 55 13.87 -28 43 19.7 18.4 c 097
2004-12-26 17:05:55 C 00 55 14.78 -28 43 13.0 18.0 c 097
2004-12-26 17:06:58 C 00 55 15.20 -28 43 09.7 17.9 c 097
2004-12-26 17:08:02 C 00 55 15.65 -28 43 06.8 18.6 c 097
2004-12-26 17:09:05 C 00 55 16.07 -28 43 03.8 18.4 c 097
2004-12-26 17:10:08 C 00 55 16.51 -28 43 00.5 18.3 c 097
2004-12-26 17:11:12 C 00 55 16.95 -28 42 57.5 18.1 c 097
2004-12-26 17:12:16 C 00 55 17.47 -28 42 54.0 18.7 c 097
2004-12-26 17:19:45 C 00 55 20.63 -28 42 31.6 17.8 c 097
2004-12-26 17:20:49 C 00 55 21.08 -28 42 28.7 18.4 c 097
2004-12-26 17:26:04 C 00 55 23.26 -28 42 12.6 17.8 c 097
2004-12-26 17:29:53 C 00 55 24.85 -28 42 01.4 18.6 c 097
2004-12-26 17:30:57 C 00 55 25.30 -28 41 58.1 18.1 c 097
2004-12-26 17:32:02 C 00 55 25.76 -28 41 54.8 18.3 c 097
2004-12-26 17:33:05 C 00 55 26.20 -28 41 51.8 18.1 c 097
2004-12-26 17:34:08 C 00 55 26.68 -28 41 48.3 19.3 c 097
2004-12-26 17:36:14 C 00 55 27.55 -28 41 41.8 19.3 c 097
2004-12-26 17:38:23 C 00 55 28.45 -28 41 35.6 18.2 c 097
2004-12-26 17:39:27 C 00 55 28.94 -28 41 32.3 19.3 c 097
2004-12-26 17:45:52 C 00 55 31.59 -28 41 13.4 18.4 c 097
2004-12-26 17:46:54 C 00 55 32.04 -28 41 10.5 18.3 c 097
2004-12-26 17:49:04 C 00 55 32.96 -28 41 03.4 18.7 c 097
2004-12-26 17:50:09 C 00 55 33.44 -28 41 00.0 18.2 c 097
2004-12-26 17:58:48 C 00 55 37.14 -28 40 33.1 18.1 c 097
2004-12-26 17:59:51 C 00 55 37.57 -28 40 30.0 19.0 c 097
2004-12-26 18:00:57 C 00 55 37.98 -28 40 27.5 19.4 c 097
2004-12-26 18:04:09 C 00 55 39.33 -28 40 17.4 19.0 c 097
2004-12-27 01:42:24 C 00 59 04.57 -28 17 39.0 o H06
2004-12-27 01:48:54 C 00 59 07.29 -28 17 19.1 o H06
2004-12-27 01:55:21 C 00 59 09.96 -28 17 00.1 o H06
2004-12-27 02:01:26 C 00 59 12.47 -28 16 41.9 o H06
2004-12-27 16:15:09 C 01 05 22.98 -27 33 56.2 c 097
2004-12-27 16:47:51 C 01 05 36.14 -27 32 17.6 c 097
2004-12-27 17:15:00 C 01 05 47.05 -27 30 54.9 c 097
2004-12-27 17:44:57 C 01 05 59.13 -27 29 22.7 c 097
2004-12-27 17:45:50 C 01 06 02.85 -27 29 29.1 c 952
2004-12-27 17:47:29 C 01 06 03.50 -27 29 22.9 c 952
2004-12-27 17:49:39 C 01 06 04.36 -27 29 16.7 c 952
2004-12-27 17:54:01 C 01 06 06.10 -27 29 03.4 c 952
2004-12-27 17:58:22 C 01 06 07.87 -27 28 50.2 c 952
2004-12-27 18:01:38 C 01 06 09.20 -27 28 40.6 c 952
2004-12-27 18:07:05 C 01 06 11.38 -27 28 24.2 c 952
2004-12-27 18:08:15 C 01 06 08.55 -27 28 11.0 c 097
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)