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
2013-01-13 22:27:11 C 08 44 26.928 -22 30 48.23 15.65 q C20
2013-01-13 22:27:50 C 08 44 26.766 -22 30 47.34 15.76 q C20
2013-01-13 22:28:01 C 08 44 27.80 -22 30 41.4 r A84
2013-01-13 22:28:28 C 08 44 26.590 -22 30 46.41 15.69 q C20
2013-01-13 22:29:06 C 08 44 26.420 -22 30 45.51 15.69 q C20
2013-01-13 22:29:14 C 08 44 27.47 -22 30 40.1 r A84
2013-01-13 22:29:44 C 08 44 26.245 -22 30 44.69 15.67 q C20
2013-01-13 22:30:23 C 08 44 26.087 -22 30 43.66 15.73 q C20
2013-01-13 22:30:28 C 08 44 27.14 -22 30 38.2 r A84
2013-01-13 22:31:01 C 08 44 25.913 -22 30 42.61 15.65 q C20
2013-01-13 22:31:39 C 08 44 25.752 -22 30 41.84 15.69 q C20
2013-01-13 22:32:18 C 08 44 25.586 -22 30 40.96 15.72 q C20
2013-01-13 22:32:55 C 08 44 26.47 -22 30 34.7 r A84
2013-01-13 22:34:09 C 08 44 26.17 -22 30 32.9 r A84
2013-01-13 22:35:22 C 08 44 25.83 -22 30 31.5 r A84
2013-01-13 22:36:35 C 08 44 25.50 -22 30 29.6 r A84
2013-01-13 22:37:49 C 08 44 25.18 -22 30 27.7 r A84
2013-01-13 22:41:17 C 08 44 24.29 -22 30 23.2 r A84
2013-01-13 22:42:30 C 08 44 23.95 -22 30 21.4 r A84
2013-01-13 22:43:44 C 08 44 23.60 -22 30 19.6 r A84
2013-01-13 22:44:57 C 08 44 23.28 -22 30 17.9 r A84
2013-01-13 22:46:11 C 08 44 22.95 -22 30 16.2 r A84
2013-01-13 22:47:24 C 08 44 22.63 -22 30 14.5 r A84
2013-01-13 22:48:37 C 08 44 22.30 -22 30 12.8 r A84
2013-01-13 22:49:51 C 08 44 21.98 -22 30 11.1 r A84
2013-01-13 22:51:04 C 08 44 21.66 -22 30 09.2 r A84
2013-01-13 22:52:18 C 08 44 21.33 -22 30 07.6 r A84
2013-01-13 22:53:46 C 08 44 20.96 -22 30 05.6 r A84
2013-01-13 22:54:59 C 08 44 20.63 -22 30 03.9 r A84
2013-01-13 22:56:12 C 08 44 20.32 -22 30 02.0 r A84
2013-01-13 22:58:39 C 08 44 19.68 -22 29 58.9 r A84
2013-01-13 22:59:52 C 08 44 19.32 -22 29 57.2 r A84
2013-01-13 23:01:05 C 08 44 19.01 -22 29 55.2 r A84
2013-01-13 23:02:19 C 08 44 18.69 -22 29 53.6 r A84
2013-01-13 23:03:32 C 08 44 18.35 -22 29 51.9 r A84
2013-01-13 23:04:45 C 08 44 18.03 -22 29 50.2 r A84
2013-01-13 23:05:59 C 08 44 17.70 -22 29 48.5 r A84
2013-01-13 23:07:12 C 08 44 17.37 -22 29 46.9 r A84
2013-01-13 23:08:25 C 08 44 17.07 -22 29 45.1 r A84
2013-01-13 23:09:39 C 08 44 16.73 -22 29 43.3 r A84
2013-01-13 23:10:52 C 08 44 16.42 -22 29 41.6 r A84
2013-01-13 23:12:06 C 08 44 16.07 -22 29 39.6 r A84
2013-01-13 23:13:19 C 08 44 15.78 -22 29 38.3 r A84
2013-01-13 23:14:32 C 08 44 15.44 -22 29 36.4 r A84
2013-01-13 23:15:46 C 08 44 15.09 -22 29 34.6 r A84
2013-01-13 23:17:00 C 08 44 14.78 -22 29 33.0 r A84
2013-01-13 23:19:23 C 08 44 14.15 -22 29 29.5 r A84
2013-01-13 23:20:36 C 08 44 13.83 -22 29 27.9 r A84
2013-01-13 23:21:50 C 08 44 13.49 -22 29 26.2 r A84
2013-01-13 23:23:04 C 08 44 13.17 -22 29 24.3 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)