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
2013-01-10 22:55:10 C 09 01 58.97 -24 02 28.5 r A84
2013-01-10 22:55:44 C 09 01 57.712 -24 02 33.21 15.9 q C20
2013-01-10 22:56:29 C 09 01 58.59 -24 02 27.0 r A84
2013-01-10 22:56:52 C 09 01 57.407 -24 02 31.90 15.95 q C20
2013-01-10 22:57:50 C 09 01 58.23 -24 02 25.9 r A84
2013-01-10 22:58:00 C 09 01 57.111 -24 02 30.62 15.83 q C20
2013-01-10 22:59:09 C 09 01 57.89 -24 02 24.2 r A84
2013-01-10 23:00:30 C 09 01 57.54 -24 02 22.7 r A84
2013-01-10 23:01:07 C 09 01 56.285 -24 02 27.03 15.97 q C20
2013-01-10 23:01:50 C 09 01 57.18 -24 02 21.3 r A84
2013-01-10 23:02:15 C 09 01 55.972 -24 02 25.72 15.92 q C20
2013-01-10 23:03:10 C 09 01 56.79 -24 02 19.7 r A84
2013-01-10 23:03:23 C 09 01 55.676 -24 02 24.38 15.94 q C20
2013-01-10 23:04:35 C 09 01 56.43 -24 02 17.6 r A84
2013-01-10 23:04:37 C 09 01 55.350 -24 02 22.94 15.86 q C20
2013-01-10 23:05:45 C 09 01 55.038 -24 02 21.55 15.93 q C20
2013-01-10 23:06:53 C 09 01 54.750 -24 02 20.44 15.98 q C20
2013-01-10 23:08:01 C 09 01 54.437 -24 02 18.90 15.89 q C20
2013-01-10 23:09:09 C 09 01 54.145 -24 02 17.70 15.94 q C20
2013-01-10 23:09:58 C 09 01 54.97 -24 02 11.5 r A84
2013-01-10 23:10:17 C 09 01 53.816 -24 02 16.35 15.93 q C20
2013-01-10 23:11:19 C 09 01 54.61 -24 02 10.2 r A84
2013-01-10 23:11:26 C 09 01 53.522 -24 02 15.06 15.95 q C20
2013-01-10 23:12:44 C 09 01 54.23 -24 02 08.5 r A84
2013-01-10 23:14:30 C 09 01 52.700 -24 02 11.50 15.96 q C20
2013-01-10 23:15:25 C 09 01 53.52 -24 02 05.7 r A84
2013-01-10 23:15:43 C 09 01 52.382 -24 02 10.09 15.97 q C20
2013-01-10 23:16:47 C 09 01 53.14 -24 02 04.0 r A84
2013-01-10 23:16:51 C 09 01 52.075 -24 02 08.62 15.98 q C20
2013-01-10 23:18:04 C 09 01 51.747 -24 02 07.32 15.94 q C20
2013-01-10 23:18:07 C 09 01 52.79 -24 02 02.5 r A84
2013-01-10 23:19:16 C 09 01 51.427 -24 02 05.83 15.93 q C20
2013-01-10 23:19:33 C 09 01 52.40 -24 02 01.1 r A84
2013-01-10 23:20:27 C 09 01 51.122 -24 02 04.47 15.87 q C20
2013-01-10 23:20:54 C 09 01 52.01 -24 01 59.1 r A84
2013-01-10 23:23:34 C 09 01 51.33 -24 01 56.4 r A84
2013-01-10 23:26:15 C 09 01 50.59 -24 01 53.4 r A84
2013-01-10 23:27:37 C 09 01 50.22 -24 01 51.5 r A84
2013-01-10 23:28:57 C 09 01 49.88 -24 01 50.3 r A84
2013-01-10 23:32:10 C 09 01 47.983 -24 01 50.65 15.9 q C20
2013-01-10 23:34:41 C 09 01 48.32 -24 01 43.4 r A84
2013-01-10 23:36:00 C 09 01 47.95 -24 01 41.9 r A84
2013-01-10 23:37:19 C 09 01 47.63 -24 01 40.7 r A84
2013-01-10 23:38:38 C 09 01 47.26 -24 01 39.1 r A84
2013-01-10 23:39:57 C 09 01 46.91 -24 01 37.5 r A84
2013-01-10 23:40:47 C 09 01 45.686 -24 01 40.56 16.05 q C20
2013-01-10 23:41:19 C 09 01 46.54 -24 01 35.7 r A84
2013-01-10 23:42:35 C 09 01 45.210 -24 01 38.34 16.13 q C20
2013-01-10 23:42:42 C 09 01 46.19 -24 01 34.5 r A84
2013-01-10 23:43:45 C 09 01 44.910 -24 01 36.96 16.07 q C20
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)