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 21:35:08 C 08 44 40.649 -22 32 00.84 q C20
2013-01-13 21:37:31 C 08 44 40.027 -22 31 57.87 q C20
2013-01-13 21:39:26 C 08 44 39.510 -22 31 54.90 q C20
2013-01-13 21:41:05 C 08 44 39.045 -22 31 52.29 q C20
2013-01-13 21:44:33 C 08 44 38.143 -22 31 48.02 q C20
2013-01-13 21:46:41 C 08 44 37.607 -22 31 45.01 15.78 q C20
2013-01-13 21:47:42 C 08 44 37.334 -22 31 43.39 15.8 q C20
2013-01-13 21:48:20 C 08 44 37.157 -22 31 42.55 15.85 q C20
2013-01-13 21:48:58 C 08 44 36.998 -22 31 41.65 15.79 q C20
2013-01-13 21:49:36 C 08 44 36.819 -22 31 40.92 15.85 q C20
2013-01-13 21:50:14 C 08 44 36.654 -22 31 39.92 15.99 q C20
2013-01-13 21:50:52 C 08 44 36.501 -22 31 38.82 15.92 q C20
2013-01-13 21:51:36 C 08 44 37.43 -22 31 31.5 r A84
2013-01-13 21:52:09 C 08 44 36.166 -22 31 37.36 15.89 q C20
2013-01-13 21:52:47 C 08 44 35.995 -22 31 36.47 15.89 q C20
2013-01-13 21:53:25 C 08 44 35.822 -22 31 35.49 16.02 q C20
2013-01-13 21:54:03 C 08 44 35.659 -22 31 34.69 16.04 q C20
2013-01-13 21:54:42 C 08 44 35.487 -22 31 33.75 16.13 q C20
2013-01-13 21:55:08 C 08 44 36.51 -22 31 26.7 r A84
2013-01-13 21:56:26 C 08 44 36.16 -22 31 24.9 r A84
2013-01-13 21:57:44 C 08 44 35.81 -22 31 23.2 r A84
2013-01-13 21:59:04 C 08 44 35.45 -22 31 21.3 r A84
2013-01-13 22:05:17 C 08 44 33.80 -22 31 12.6 r A84
2013-01-13 22:06:36 C 08 44 33.45 -22 31 11.0 r A84
2013-01-13 22:07:54 C 08 44 33.11 -22 31 09.1 r A84
2013-01-13 22:09:13 C 08 44 32.80 -22 31 07.5 r A84
2013-01-13 22:10:31 C 08 44 32.43 -22 31 05.7 r A84
2013-01-13 22:11:50 C 08 44 32.08 -22 31 03.9 r A84
2013-01-13 22:13:52 C 08 44 31.52 -22 31 01.0 r A84
2013-01-13 22:15:06 C 08 44 31.20 -22 30 59.3 r A84
2013-01-13 22:16:20 C 08 44 30.88 -22 30 57.6 r A84
2013-01-13 22:17:34 C 08 44 30.55 -22 30 55.9 r A84
2013-01-13 22:18:47 C 08 44 30.23 -22 30 54.1 r A84
2013-01-13 22:19:07 C 08 44 29.046 -22 30 59.53 15.74 q C20
2013-01-13 22:20:01 C 08 44 29.89 -22 30 52.5 r A84
2013-01-13 22:20:10 C 08 44 28.774 -22 30 58.00 15.77 q C20
2013-01-13 22:20:49 C 08 44 28.614 -22 30 57.22 15.79 q C20
2013-01-13 22:21:16 C 08 44 29.57 -22 30 50.8 r A84
2013-01-13 22:21:27 C 08 44 28.440 -22 30 56.28 15.76 q C20
2013-01-13 22:22:05 C 08 44 28.276 -22 30 55.26 15.74 q C20
2013-01-13 22:22:30 C 08 44 29.24 -22 30 49.1 r A84
2013-01-13 22:22:43 C 08 44 28.100 -22 30 54.46 15.68 q C20
2013-01-13 22:23:22 C 08 44 27.933 -22 30 53.51 15.72 q C20
2013-01-13 22:23:44 C 08 44 28.90 -22 30 47.2 r A84
2013-01-13 22:24:00 C 08 44 27.758 -22 30 52.61 15.74 q C20
2013-01-13 22:24:38 C 08 44 27.604 -22 30 51.81 15.73 q C20
2013-01-13 22:25:17 C 08 44 27.434 -22 30 50.81 15.61 q C20
2013-01-13 22:25:55 C 08 44 27.268 -22 30 50.15 15.72 q C20
2013-01-13 22:26:33 C 08 44 27.095 -22 30 49.08 15.65 q C20
2013-01-13 22:26:47 C 08 44 28.10 -22 30 43.0 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)