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
2013-02-03 14:00:54 C 07 11 16.72 -07 09 19.3 u D20
2013-02-03 19:00:21 C 07 10 43.88 -07 01 12.0 q C27
2013-02-03 19:03:57 C 07 10 43.37 -07 01 05.5 q C27
2013-02-03 19:57:24 C 07 10 36.61 -06 59 24.5 q C27
2013-02-03 19:59:41 C 07 10 36.28 -06 59 20.7 q C27
2013-02-03 21:05:25 C 07 10 27.70 -06 57 16.3 u B49
2013-02-03 21:07:52 C 07 10 27.00 -06 57 14.7 q B88
2013-02-03 21:08:02 C 07 10 27.40 -06 57 11.8 u B49
2013-02-03 21:09:58 C 07 10 27.17 -06 57 08.6 u B49
2013-02-03 21:54:03 C 07 10 21.69 -06 55 42.0 q I89
2013-02-03 21:56:35 C 07 10 21.37 -06 55 37.2 q I89
2013-02-03 21:56:58 C 07 10 20.59 -06 55 41.5 q B88
2013-02-03 21:59:09 C 07 10 21.01 -06 55 32.4 q I89
2013-02-03 22:05:31 C 07 10 20.16 -06 55 20.2 q I89
2013-02-03 22:08:03 C 07 10 19.85 -06 55 15.6 q I89
2013-02-03 22:09:29 C 07 10 19.67 -06 55 12.8 q I89
2013-02-03 22:11:59 C 07 10 18.48 -06 55 13.2 C91
2013-02-03 22:12:35 C 07 10 19.25 -06 55 06.9 q I89
2013-02-03 22:15:41 C 07 10 18.85 -06 55 01.3 q I89
2013-02-03 22:17:40 C 07 10 17.92 -06 55 02.3 q B88
2013-02-03 22:20:15 C 07 10 18.25 -06 54 52.5 q I89
2013-02-03 22:23:00 C 07 10 17.06 -06 54 51.4 C91
2013-02-03 22:23:19 C 07 10 17.84 -06 54 46.5 q I89
2013-02-03 22:26:24 C 07 10 17.43 -06 54 40.8 q I89
2013-02-03 22:30:59 C 07 10 15.98 -06 54 37.0 C91
2013-02-04 12:58:38 C 07 08 40.75 -06 25 58.2 u D20
2013-02-04 12:59:04 C 07 08 40.69 -06 25 57.3 u D20
2013-02-04 12:59:31 C 07 08 40.63 -06 25 56.4 u D20
2013-02-04 13:59:34 C 07 08 32.97 -06 24 04.5 u D20
2013-02-04 14:00:00 C 07 08 32.91 -06 24 03.7 u D20
2013-02-04 14:00:29 C 07 08 32.86 -06 24 02.8 u D20
2013-02-04 14:59:34 C 07 08 25.31 -06 22 12.1 u D20
2013-02-04 15:00:01 C 07 08 25.24 -06 22 11.2 u D20
2013-02-04 15:00:29 C 07 08 25.20 -06 22 10.2 u D20
2013-02-04 15:33:20 C 07 08 22.098 -06 22 17.05 q O44
2013-02-04 15:35:16 C 07 08 21.849 -06 22 13.44 q O44
2013-02-04 15:39:36 C 07 08 21.295 -06 22 05.35 q O44
2013-02-04 15:40:10 C 07 08 21.220 -06 22 04.24 q O44
2013-02-04 15:40:44 C 07 08 21.148 -06 22 03.17 q O44
2013-02-04 15:41:19 C 07 08 21.073 -06 22 02.12 q O44
2013-02-04 15:41:53 C 07 08 21.000 -06 22 01.02 q O44
2013-02-04 15:43:13 C 07 08 20.829 -06 21 58.54 q O44
2013-02-04 15:44:22 C 07 08 20.683 -06 21 56.37 q O44
2013-02-04 15:44:57 C 07 08 20.608 -06 21 55.27 q O44
2013-02-04 15:46:54 C 07 08 20.356 -06 21 51.63 q O44
2013-02-04 15:47:29 C 07 08 20.281 -06 21 50.51 q O44
2013-02-04 15:48:03 C 07 08 20.209 -06 21 49.48 q O44
2013-02-04 15:48:38 C 07 08 20.134 -06 21 48.37 q O44
2013-02-04 15:49:13 C 07 08 20.060 -06 21 47.26 q O44
2013-02-04 15:50:17 C 07 08 19.923 -06 21 45.26 q O44
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)