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
2013-01-19 21:03:28 C 08 11 17.24 -18 39 06.0 o 071
2013-01-19 21:04:44 C 08 11 16.95 -18 39 03.7 o 071
2013-01-19 21:05:49 C 08 11 16.70 -18 39 01.9 o 071
2013-01-19 21:07:05 C 08 11 16.38 -18 38 59.5 o 071
2013-01-19 21:08:10 C 08 11 16.14 -18 38 57.3 o 071
2013-01-19 21:09:26 C 08 11 15.84 -18 38 55.6 o 071
2013-01-19 21:10:31 C 08 11 15.53 -18 38 53.2 o 071
2013-01-19 21:11:46 C 08 11 15.30 -18 38 51.5 o 071
2013-01-19 21:12:52 C 08 11 15.01 -18 38 49.4 o 071
2013-01-19 21:14:07 C 08 11 14.71 -18 38 47.1 o 071
2013-01-19 21:15:13 C 08 11 14.41 -18 38 43.2 o 071
2013-01-19 21:16:29 C 08 11 14.15 -18 38 42.9 o 071
2013-01-19 21:17:34 C 08 11 13.86 -18 38 40.7 o 071
2013-01-19 21:18:50 C 08 11 13.59 -18 38 38.7 o 071
2013-01-19 21:19:55 C 08 11 13.30 -18 38 36.7 o 071
2013-01-19 21:21:10 C 08 11 13.03 -18 38 34.5 o 071
2013-01-19 21:22:15 C 08 11 12.75 -18 38 32.9 o 071
2013-01-19 21:23:31 C 08 11 12.47 -18 38 30.7 o 071
2013-01-19 21:25:17 C 08 11 12.04 -18 38 27.2 o 071
2013-01-19 21:26:33 C 08 11 11.77 -18 38 25.0 o 071
2013-01-19 21:27:37 C 08 11 11.49 -18 38 21.9 o 071
2013-01-19 21:28:54 C 08 11 11.19 -18 38 20.6 o 071
2013-01-19 21:29:58 C 08 11 10.93 -18 38 18.8 o 071
2013-01-19 21:31:14 C 08 11 10.64 -18 38 16.6 o 071
2013-01-19 21:32:19 C 08 11 10.35 -18 38 14.3 o 071
2013-01-19 21:33:35 C 08 11 10.06 -18 38 12.1 o 071
2013-01-19 21:34:40 C 08 11 09.77 -18 38 10.4 o 071
2013-01-19 21:39:22 C 08 11 08.69 -18 38 02.1 o 071
2013-01-19 21:40:39 C 08 11 08.38 -18 37 59.8 o 071
2013-01-19 21:41:44 C 08 11 08.13 -18 37 58.1 o 071
2013-01-19 21:46:25 C 08 11 07.04 -18 37 49.7 o 071
2013-01-19 21:47:42 C 08 11 06.68 -18 37 47.0 o 071
2013-01-19 21:49:20 C 08 11 06.28 -18 37 44.2 o 071
2013-01-19 21:50:36 C 08 11 06.01 -18 37 41.9 o 071
2013-01-19 21:51:42 C 08 11 05.72 -18 37 40.1 o 071
2013-01-19 21:52:57 C 08 11 05.45 -18 37 37.7 o 071
2013-01-19 21:54:03 C 08 11 05.20 -18 37 35.5 o 071
2013-01-19 21:55:18 C 08 11 04.87 -18 37 33.7 o 071
2013-01-19 21:56:24 C 08 11 04.58 -18 37 32.1 o 071
2013-01-19 21:57:40 C 08 11 04.29 -18 37 29.1 o 071
2013-01-19 21:58:44 C 08 11 04.10 -18 37 27.5 o 071
2013-01-19 22:00:01 C 08 11 03.63 -18 37 24.1 o 071
2013-01-19 22:05:47 C 08 11 02.35 -18 37 14.5 o 071
2013-01-19 22:07:03 C 08 11 02.09 -18 37 12.6 o 071
2013-01-19 22:08:08 C 08 11 01.77 -18 37 09.9 o 071
2013-01-19 22:09:25 C 08 11 01.48 -18 37 07.9 o 071
2013-01-19 22:10:29 C 08 11 01.20 -18 37 06.5 o 071
2013-01-19 22:11:46 C 08 11 00.96 -18 37 04.0 o 071
2013-01-19 22:12:52 C 08 11 00.62 -18 37 01.6 o 071
2013-01-19 22:14:07 C 08 11 00.38 -18 36 59.4 o 071
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)