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
2021-03-05 22:04:05 S 09 26 18.574 -07 54 19.80 V C57
2021-03-05 22:04:05 s 1 -175946.81 6 +56511.824 7580.0 C57
2021-03-05 22:04:10 C 09 27 11.92 -07 43 45.3 V K87
2021-03-05 22:05:13 C 09 27 11.70 -07 43 43.2 V K87
2021-03-05 22:05:33 C 09 27 12.17 -07 43 44.2 q K05
2021-03-05 22:06:17 C 09 27 11.55 -07 43 41.1 V K87
2021-03-05 22:07:10 C 09 27 11.12 -07 43 40.1 V G34
2021-03-05 22:07:20 C 09 27 11.33 -07 43 39.1 V K87
2021-03-05 22:08:24 C 09 27 11.09 -07 43 36.8 V K87
2021-03-05 22:09:31 C 09 27 10.68 -07 43 35.7 V G34
2021-03-05 22:11:52 C 09 27 10.20 -07 43 30.9 V G34
2021-03-05 22:13:26 C 09 27 10.62 -07 43 28.9 q K05
2021-03-05 22:14:05 S 09 26 16.322 -07 53 57.70 V C57
2021-03-05 22:14:05 s 1 -175610.65 9 +55619.385 4880.0 C57
2021-03-05 22:14:13 C 09 27 09.79 -07 43 26.7 V G34
2021-03-05 22:16:35 C 09 27 09.25 -07 43 21.6 V G34
2021-03-05 22:18:56 C 09 27 08.80 -07 43 17.3 V G34
2021-03-05 22:21:17 C 09 27 08.30 -07 43 12.3 V G34
2021-03-05 22:21:19 C 09 27 09.07 -07 43 13.3 q K05
2021-03-05 22:24:05 S 09 26 14.042 -07 53 36.24 V C57
2021-03-05 22:24:05 s 1 -175270.66 3 +54725.733 4840.0 C57
2021-03-05 22:29:11 C 09 27 07.50 -07 42 57.6 q K05
2021-03-05 22:31:42 C 09 27 06.22 -07 42 50.6 V K61
2021-03-05 22:34:05 S 09 26 11.786 -07 53 13.42 V C57
2021-03-05 22:34:05 s 1 -174926.80 1 +53830.878 7400.0 C57
2021-03-05 22:34:38 C 09 27 05.64 -07 42 44.8 V K61
2021-03-05 22:35:17 C 09 27 05.52 -07 42 43.5 V K61
2021-03-05 22:35:55 C 09 27 05.39 -07 42 42.3 V K61
2021-03-05 22:44:05 S 09 26 09.540 -07 52 52.03 V C57
2021-03-05 22:44:05 s 1 -174579.04 2 +52934.827 2510.0 C57
2021-03-05 22:54:05 S 09 26 07.255 -07 52 30.11 V C57
2021-03-05 22:54:05 s 1 -174227.35 6 +52037.590 110.0 C57
2021-03-05 22:58:58 C 09 27 01.64 -07 41 59.3 V Z80
2021-03-05 23:04:05 S 09 26 05.021 -07 52 07.25 V C57
2021-03-05 23:04:05 s 1 -173871.71 4 +51139.174 140.0 C57
2021-03-05 23:08:59 C 09 26 59.69 -07 41 39.4 V Z80
2021-03-05 23:14:05 S 09 26 02.729 -07 51 45.79 V C57
2021-03-05 23:14:05 s 1 -173512.08 5 +50239.589 2530.0 C57
2021-03-05 23:18:58 C 09 26 57.71 -07 41 19.6 V Z80
2021-03-05 23:24:05 S 09 26 00.502 -07 51 23.83 V C57
2021-03-05 23:24:05 s 1 -173148.43 8 +49338.845 7230.0 C57
2021-03-05 23:28:38 C 09 26 55.46 -07 40 54.1 q G07
2021-03-05 23:28:59 C 09 26 55.74 -07 40 59.7 V Z80
2021-03-05 23:34:05 S 09 25 58.236 -07 51 01.30 V C57
2021-03-05 23:34:05 s 1 -172780.74 2 +48436.950 4170.0 C57
2021-03-05 23:39:33 C 09 26 53.62 -07 40 38.7 V Z80
2021-03-05 23:44:05 S 09 25 55.999 -07 50 40.06 V C57
2021-03-05 23:44:05 s 1 -172408.96 6 +47533.915 3300.0 C57
2021-03-05 23:54:05 S 09 25 53.765 -07 50 17.23 V C57
2021-03-05 23:54:05 s 1 -172033.07 7 +46629.749 4540.0 C57
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)