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
2013-01-13 23:24:17 C 08 44 12.85 -22 29 22.7 r A84
2013-01-13 23:25:30 C 08 44 12.52 -22 29 20.9 r A84
2013-01-13 23:26:44 C 08 44 12.21 -22 29 19.2 r A84
2013-01-13 23:29:11 C 08 44 11.55 -22 29 15.6 r A84
2013-01-13 23:30:25 C 08 44 11.22 -22 29 13.9 r A84
2013-01-13 23:31:38 C 08 44 10.91 -22 29 12.3 r A84
2013-01-13 23:32:52 C 08 44 10.57 -22 29 10.4 r A84
2013-01-13 23:34:05 C 08 44 10.24 -22 29 08.6 r A84
2013-01-13 23:35:19 C 08 44 09.93 -22 29 07.0 r A84
2013-01-13 23:36:33 C 08 44 09.60 -22 29 05.2 r A84
2013-01-13 23:39:10 C 08 44 08.92 -22 29 01.5 r A84
2013-01-13 23:40:23 C 08 44 08.58 -22 28 59.8 r A84
2013-01-13 23:41:37 C 08 44 08.24 -22 28 58.0 r A84
2013-01-13 23:42:50 C 08 44 07.92 -22 28 56.2 r A84
2013-01-13 23:44:10 C 08 44 07.57 -22 28 54.3 r A84
2013-01-13 23:45:23 C 08 44 07.25 -22 28 52.5 r A84
2013-01-13 23:46:37 C 08 44 06.90 -22 28 50.6 r A84
2013-01-13 23:47:50 C 08 44 06.60 -22 28 49.0 r A84
2013-01-13 23:49:04 C 08 44 06.26 -22 28 47.2 r A84
2013-01-13 23:50:17 C 08 44 05.94 -22 28 45.4 r A84
2013-01-13 23:51:31 C 08 44 05.62 -22 28 43.7 r A84
2013-01-13 23:52:45 C 08 44 05.29 -22 28 42.1 r A84
2013-01-13 23:53:58 C 08 44 04.97 -22 28 40.2 r A84
2013-01-13 23:55:12 C 08 44 04.64 -22 28 38.4 r A84
2013-01-13 23:56:25 C 08 44 04.31 -22 28 36.7 r A84
2013-01-13 23:57:56 C 08 44 03.91 -22 28 34.5 r A84
2013-01-13 23:59:10 C 08 44 03.57 -22 28 32.7 r A84
2013-01-14 00:00:24 C 08 44 03.27 -22 28 31.1 r A84
2013-01-14 00:01:37 C 08 44 02.94 -22 28 29.1 r A84
2013-01-14 00:02:51 C 08 44 02.62 -22 28 27.5 r A84
2013-01-14 00:04:04 C 08 44 02.28 -22 28 25.5 r A84
2013-01-14 00:05:18 C 08 44 01.97 -22 28 23.9 r A84
2013-01-14 00:06:31 C 08 44 01.65 -22 28 22.1 r A84
2013-01-14 00:07:45 C 08 44 01.31 -22 28 20.3 r A84
2013-01-14 00:08:58 C 08 44 00.97 -22 28 18.6 r A84
2013-01-14 00:10:12 C 08 44 00.67 -22 28 16.8 r A84
2013-01-14 00:11:25 C 08 44 00.35 -22 28 15.0 r A84
2013-01-14 00:12:39 C 08 44 00.01 -22 28 13.1 r A84
2013-01-14 00:13:52 C 08 43 59.70 -22 28 11.5 r A84
2013-01-14 00:15:06 C 08 43 59.37 -22 28 09.6 r A84
2013-01-14 00:16:19 C 08 43 59.05 -22 28 08.0 r A84
2013-01-14 00:17:33 C 08 43 58.73 -22 28 06.1 r A84
2013-01-14 00:18:47 C 08 43 58.40 -22 28 04.3 r A84
2013-01-14 00:20:00 C 08 43 58.08 -22 28 02.7 r A84
2013-01-14 00:21:14 C 08 43 57.75 -22 28 00.7 r A84
2013-01-14 00:29:12 C 08 43 55.64 -22 27 49.1 r A84
2013-01-14 00:31:45 C 08 43 54.96 -22 27 45.7 r A84
2013-01-14 00:37:50 C 08 43 53.38 -22 27 36.7 r A84
2013-01-14 00:39:05 C 08 43 53.04 -22 27 34.7 r A84
2013-01-14 00:40:27 C 08 43 52.68 -22 27 32.8 r A84
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)