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 23:44:02 C 09 01 45.79 -24 01 32.6 r A84
2013-01-10 23:44:53 C 09 01 44.613 -24 01 35.76 16.11 q C20
2013-01-10 23:45:22 C 09 01 45.48 -24 01 31.1 r A84
2013-01-10 23:46:25 C 09 01 44.196 -24 01 33.95 16.06 q C20
2013-01-10 23:46:40 C 09 01 45.10 -24 01 29.6 r A84
2013-01-10 23:47:33 C 09 01 43.895 -24 01 32.60 16.0 q C20
2013-01-10 23:47:59 C 09 01 44.76 -24 01 28.0 r A84
2013-01-10 23:48:41 C 09 01 43.596 -24 01 31.29 16.05 q C20
2013-01-10 23:49:18 C 09 01 44.39 -24 01 26.7 r A84
2013-01-10 23:49:50 C 09 01 43.283 -24 01 29.84 15.97 q C20
2013-01-10 23:50:37 C 09 01 44.05 -24 01 25.1 r A84
2013-01-10 23:50:59 C 09 01 42.975 -24 01 28.44 15.89 q C20
2013-01-10 23:51:57 C 09 01 43.68 -24 01 23.8 r A84
2013-01-10 23:52:07 C 09 01 42.681 -24 01 27.05 15.93 q C20
2013-01-10 23:53:15 C 09 01 42.369 -24 01 25.85 16.02 q C20
2013-01-10 23:53:17 C 09 01 43.32 -24 01 21.9 r A84
2013-01-10 23:54:36 C 09 01 42.96 -24 01 20.3 r A84
2013-01-10 23:55:55 C 09 01 42.64 -24 01 19.1 r A84
2013-01-10 23:57:14 C 09 01 42.25 -24 01 17.2 r A84
2013-01-10 23:58:33 C 09 01 41.93 -24 01 16.0 r A84
2013-01-10 23:59:54 C 09 01 41.54 -24 01 14.0 r A84
2013-01-11 00:01:14 C 09 01 41.17 -24 01 12.7 r A84
2013-01-11 00:02:33 C 09 01 40.83 -24 01 11.1 r A84
2013-01-11 00:03:53 C 09 01 40.48 -24 01 09.8 r A84
2013-01-11 00:05:12 C 09 01 40.09 -24 01 07.9 r A84
2013-01-11 00:06:31 C 09 01 39.78 -24 01 06.5 r A84
2013-01-11 00:07:50 C 09 01 39.42 -24 01 05.1 r A84
2013-01-11 00:09:10 C 09 01 39.05 -24 01 03.4 r A84
2013-01-11 00:10:31 C 09 01 38.68 -24 01 01.7 r A84
2013-01-11 00:11:49 C 09 01 38.33 -24 00 59.7 r A84
2013-01-11 00:13:09 C 09 01 37.97 -24 00 58.7 r A84
2013-01-11 00:14:27 C 09 01 37.63 -24 00 57.1 r A84
2013-01-11 00:15:47 C 09 01 37.29 -24 00 55.7 r A84
2013-01-11 00:17:06 C 09 01 36.91 -24 00 54.3 r A84
2013-01-11 00:18:26 C 09 01 36.54 -24 00 52.5 r A84
2013-01-11 00:19:45 C 09 01 36.20 -24 00 51.0 r A84
2013-01-11 00:21:04 C 09 01 35.84 -24 00 48.9 r A84
2013-01-11 00:25:00 C 09 01 34.77 -24 00 44.6 r A84
2013-01-11 00:27:11 C 09 01 34.21 -24 00 42.3 r A84
2013-01-11 00:28:29 C 09 01 33.85 -24 00 40.5 r A84
2013-01-11 00:29:49 C 09 01 33.51 -24 00 39.1 r A84
2013-01-11 00:31:07 C 09 01 33.13 -24 00 37.2 r A84
2013-01-11 00:33:45 C 09 01 32.42 -24 00 34.3 r A84
2013-01-11 00:36:23 C 09 01 31.71 -24 00 31.2 r A84
2013-01-11 01:00:03 C 09 01 25.38 -24 00 02.8 r A84
2013-01-11 01:02:44 C 09 01 24.66 -23 59 59.3 r A84
2013-01-11 01:04:03 C 09 01 24.33 -23 59 58.2 r A84
2013-01-11 01:05:22 C 09 01 23.96 -23 59 56.4 r A84
2013-01-11 01:06:42 C 09 01 23.60 -23 59 54.8 r A84
2013-01-11 01:08:01 C 09 01 23.23 -23 59 53.1 r A84
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)