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
2013-01-11 01:09:22 C 09 01 22.88 -23 59 51.6 r A84
2013-01-11 01:10:40 C 09 01 22.54 -23 59 50.0 r A84
2013-01-11 01:12:00 C 09 01 22.19 -23 59 48.3 r A84
2013-01-11 01:13:18 C 09 01 21.84 -23 59 46.6 r A84
2013-01-11 01:14:38 C 09 01 21.48 -23 59 45.3 r A84
2013-01-11 01:15:56 C 09 01 21.14 -23 59 43.4 r A84
2013-01-11 01:17:16 C 09 01 20.76 -23 59 42.0 r A84
2013-01-11 01:18:33 C 09 01 20.42 -23 59 40.3 r A84
2013-01-11 01:20:40 C 09 01 19.89 -23 59 37.6 r A84
2013-01-11 01:21:58 C 09 01 19.51 -23 59 35.9 r A84
2013-01-11 01:23:18 C 09 01 19.18 -23 59 34.7 r A84
2013-01-11 01:24:36 C 09 01 18.80 -23 59 33.1 r A84
2013-01-11 01:25:56 C 09 01 18.47 -23 59 31.3 r A84
2013-01-11 01:27:13 C 09 01 18.12 -23 59 29.8 r A84
2013-01-11 01:28:37 C 09 01 17.75 -23 59 28.2 r A84
2013-01-11 01:29:56 C 09 01 17.41 -23 59 26.4 r A84
2013-01-11 01:31:16 C 09 01 17.08 -23 59 25.1 r A84
2013-01-11 01:32:34 C 09 01 16.68 -23 59 23.3 r A84
2013-01-11 01:33:54 C 09 01 16.32 -23 59 21.5 r A84
2013-01-11 01:35:11 C 09 01 16.00 -23 59 20.0 r A84
2013-01-11 01:36:31 C 09 01 15.62 -23 59 18.2 r A84
2013-01-11 01:37:49 C 09 01 15.28 -23 59 16.5 r A84
2013-01-11 01:39:08 C 09 01 14.93 -23 59 15.2 r A84
2013-01-11 01:40:27 C 09 01 14.58 -23 59 13.5 r A84
2013-01-11 01:41:46 C 09 01 14.24 -23 59 11.8 r A84
2013-01-11 01:43:06 C 09 01 13.89 -23 59 10.3 r A84
2013-01-11 01:44:25 C 09 01 13.54 -23 59 08.4 r A84
2013-01-11 01:45:43 C 09 01 13.18 -23 59 06.9 r A84
2013-01-11 01:47:03 C 09 01 12.81 -23 59 05.4 r A84
2013-01-11 01:48:21 C 09 01 12.50 -23 59 03.8 r A84
2013-01-11 01:49:41 C 09 01 12.14 -23 59 02.2 r A84
2013-01-11 01:52:19 C 09 01 11.45 -23 58 59.2 r A84
2013-01-11 01:53:40 C 09 01 11.07 -23 58 57.2 r A84
2013-01-11 01:54:59 C 09 01 10.71 -23 58 55.5 r A84
2013-01-11 01:56:20 C 09 01 10.39 -23 58 53.7 r A84
2013-01-11 02:01:37 C 09 01 08.95 -23 58 47.1 r A84
2013-01-11 03:14:35 C 09 00 52.06 -23 57 28.6 u B74
2013-01-11 03:26:53 C 09 00 48.81 -23 57 13.5 u B74
2013-01-11 03:38:50 C 09 00 45.69 -23 56 58.2 u B74
2013-01-11 03:47:37 C 09 00 43.30 -23 56 48.2 u B74
2013-01-11 16:52:02 C 08 57 31.37 -23 39 39.2 u Q62
2013-01-11 16:52:49 C 08 57 31.16 -23 39 38.2 u Q62
2013-01-11 16:53:34 C 08 57 30.97 -23 39 37.3 u Q62
2013-01-11 16:54:19 C 08 57 30.76 -23 39 36.3 u Q62
2013-01-11 16:55:06 C 08 57 30.55 -23 39 35.4 u Q62
2013-01-11 20:37:16 C 08 56 40.308 -23 36 36.08 15.93 q C20
2013-01-11 20:39:38 C 08 56 39.703 -23 36 33.52 16.16 q C20
2013-01-11 20:42:36 C 08 56 38.913 -23 36 30.05 16.05 q C20
2013-01-11 20:44:12 C 08 56 38.509 -23 36 28.12 15.99 q C20
2013-01-11 20:45:53 C 08 56 38.057 -23 36 26.18 16.23 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)