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
2012-12-03 01:35:13 C 12 06 40.488 -25 22 20.07 188
2012-12-03 01:36:25 C 12 06 40.244 -25 22 20.09 188
2012-12-03 01:37:36 C 12 06 40.015 -25 22 20.76 188
2012-12-03 01:38:47 C 12 06 39.770 -25 22 20.82 188
2012-12-03 01:39:57 C 12 06 39.565 -25 22 21.28 188
2012-12-09 05:13:40 C 11 41 13.69 -26 08 55.8 q 204
2012-12-09 05:21:23 C 11 41 12.23 -26 08 58.4 q 204
2012-12-09 05:29:02 C 11 41 10.80 -26 09 01.1 q 204
2012-12-12 07:58:30 C 11 28 40.30 -26 29 32.1 u 807
2012-12-12 08:05:42 C 11 28 38.97 -26 29 34.8 u 807
2012-12-12 08:12:46 C 11 28 37.64 -26 29 37.5 u 807
2012-12-12 08:19:51 C 11 28 36.33 -26 29 40.0 u 807
2012-12-12 08:24:46 C 11 28 35.40 -26 29 41.8 u 807
2012-12-12 16:21:24 C 11 27 15.86 -26 31 45.0 u 423
2012-12-12 16:56:36 C 11 27 09.39 -26 31 58.1 u 423
2012-12-13 11:07:01 C 11 24 03.49 -26 38 26.6 r H06
2012-12-13 11:25:22 C 11 24 00.00 -26 38 32.1 r H06
2012-12-13 11:43:47 C 11 23 56.51 -26 38 39.3 r H06
2012-12-13 15:46:44 C 11 23 18.00 -26 38 10.6 u 423
2012-12-13 16:25:49 C 11 23 10.87 -26 38 25.2 u 423
2012-12-14 00:00:25 C 11 21 51.27 -26 42 01.8 188
2012-12-14 00:02:07 C 11 21 50.98 -26 42 02.3 188
2012-12-14 00:03:48 C 11 21 50.65 -26 42 02.9 188
2012-12-14 00:05:29 C 11 21 50.34 -26 42 03.3 188
2012-12-14 00:08:51 C 11 21 49.70 -26 42 04.3 188
2012-12-14 00:10:31 C 11 21 49.37 -26 42 04.9 188
2012-12-14 00:12:14 C 11 21 49.05 -26 42 05.4 188
2012-12-14 00:13:54 C 11 21 48.75 -26 42 05.9 188
2012-12-14 00:15:35 C 11 21 48.41 -26 42 06.4 188
2012-12-14 00:17:16 C 11 21 48.09 -26 42 06.9 188
2012-12-14 00:18:57 C 11 21 47.77 -26 42 07.5 188
2012-12-14 00:20:38 C 11 21 47.46 -26 42 08.0 188
2012-12-14 00:22:20 C 11 21 47.14 -26 42 08.5 188
2012-12-14 00:24:01 C 11 21 46.80 -26 42 09.0 188
2012-12-14 00:25:43 C 11 21 46.49 -26 42 09.4 188
2012-12-14 00:27:24 C 11 21 46.16 -26 42 10.0 188
2012-12-14 00:29:05 C 11 21 45.84 -26 42 10.5 188
2012-12-14 00:30:46 C 11 21 45.52 -26 42 10.9 188
2012-12-14 00:32:26 C 11 21 45.21 -26 42 11.4 188
2012-12-14 00:34:07 C 11 21 44.89 -26 42 11.9 188
2012-12-14 00:35:48 C 11 21 44.56 -26 42 12.5 188
2012-12-14 00:37:29 C 11 21 44.25 -26 42 12.9 188
2012-12-14 00:39:11 C 11 21 43.92 -26 42 13.5 188
2012-12-14 00:40:52 C 11 21 43.61 -26 42 13.9 188
2012-12-14 00:42:33 C 11 21 43.26 -26 42 14.5 188
2012-12-14 00:44:15 C 11 21 42.96 -26 42 14.9 188
2012-12-14 00:45:56 C 11 21 42.63 -26 42 15.4 188
2012-12-14 00:53:47 C 11 21 41.11 -26 42 17.7 188
2012-12-14 00:55:28 C 11 21 40.80 -26 42 18.2 188
2012-12-14 00:57:10 C 11 21 40.49 -26 42 18.5 188
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)