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
2008-01-09 15:49:05 C 16 17 09.415 -21 19 48.28 L 568
2008-01-09 15:51:52 C 16 17 09.953 -21 19 49.41 L 568
2008-01-09 15:54:54 C 16 17 10.506 -21 19 50.39 L 568
2008-01-09 15:57:43 C 16 17 11.010 -21 19 51.46 L 568
2011-03-04 19:35:24 C 02 06 36.62 +10 26 28.4 o 586
2011-03-04 19:41:20 C 02 06 37.76 +10 26 34.7 v 586
2011-03-04 19:47:36 C 02 06 38.89 +10 26 40.1 v 586
2011-03-05 18:55:52 C 02 10 45.91 +10 46 49.5 o 586
2011-03-05 19:00:41 C 02 10 46.73 +10 46 53.3 o 586
2011-03-05 19:02:14 C 02 10 46.99 +10 46 54.8 o 586
2011-03-05 19:11:21 C 02 10 48.63 +10 47 02.4 o 586
2011-03-05 19:12:52 C 02 10 48.91 +10 47 04.3 o 586
2011-03-05 19:18:20 C 02 10 49.86 +10 47 08.6 o 586
2011-03-05 19:19:50 C 02 10 50.11 +10 47 10.1 o 586
2011-03-05 19:24:24 C 02 10 50.96 +10 47 14.1 o 586
2011-03-05 19:25:56 C 02 10 51.19 +10 47 15.4 o 586
2011-03-05 19:30:30 C 02 10 52.00 +10 47 18.7 o 586
2011-03-05 19:34:01 C 02 10 52.63 +10 47 21.9 o 586
2011-03-05 19:35:31 C 02 10 52.87 +10 47 23.5 o 586
2011-03-05 19:40:05 C 02 10 53.68 +10 47 27.3 o 586
2011-03-05 19:44:40 C 02 10 54.51 +10 47 31.1 o 586
2011-03-05 19:47:42 C 02 10 55.07 +10 47 34.0 o 586
2011-03-05 19:49:40 C 02 10 55.37 +10 47 35.4 o 586
2011-03-05 19:55:44 C 02 10 56.47 +10 47 40.5 o 586
2011-03-05 19:57:16 C 02 10 56.69 +10 47 41.7 o 586
2011-03-06 19:07:54 C 02 15 03.60 +11 07 35.4 o 586
2011-03-06 19:09:26 C 02 15 03.84 +11 07 36.4 o 586
2011-03-06 19:10:57 C 02 15 04.12 +11 07 37.8 o 586
2011-03-06 19:12:29 C 02 15 04.40 +11 07 39.1 o 586
2011-03-06 19:14:00 C 02 15 04.68 +11 07 40.5 o 586
2011-03-06 19:15:31 C 02 15 04.93 +11 07 41.7 o 586
2011-03-06 19:17:03 C 02 15 05.22 +11 07 43.0 o 586
2011-03-06 19:18:33 C 02 15 05.48 +11 07 44.3 o 586
2011-03-06 19:20:40 C 02 15 05.80 +11 07 45.2 o 586
2011-03-06 19:22:10 C 02 15 06.08 +11 07 47.1 o 586
2011-03-06 19:23:43 C 02 15 06.37 +11 07 48.4 o 586
2011-03-06 19:25:14 C 02 15 06.69 +11 07 50.1 o 586
2011-03-06 19:26:44 C 02 15 06.91 +11 07 51.4 o 586
2011-03-06 19:28:17 C 02 15 07.19 +11 07 52.4 o 586
2011-03-06 19:36:35 C 02 15 08.68 +11 07 59.4 o 586
2011-03-06 19:38:08 C 02 15 08.96 +11 08 01.3 o 586
2011-03-06 19:39:38 C 02 15 09.20 +11 08 01.7 o 586
2011-03-06 19:41:09 C 02 15 09.46 +11 08 03.4 o 586
2011-03-06 19:42:42 C 02 15 09.74 +11 08 04.8 o 586
2011-03-06 19:45:45 C 02 15 10.27 +11 08 07.4 o 586
2011-03-06 19:47:15 C 02 15 10.54 +11 08 08.7 o 586
2011-03-06 19:48:46 C 02 15 10.84 +11 08 09.9 o 586
2011-03-06 19:50:19 C 02 15 11.06 +11 08 11.1 o 586
2011-03-06 19:51:49 C 02 15 11.38 +11 08 12.7 o 586
2011-03-07 19:05:52 C 02 19 18.33 +11 27 50.2 o 586
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)