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
2013-01-24 19:11:39 C 07 47 09.06 -14 54 09.3 u 089
2013-01-24 19:14:30 C 07 47 08.44 -14 54 03.2 u 089
2013-01-24 19:17:21 C 07 47 07.89 -14 53 57.9 u 089
2013-01-24 19:20:12 C 07 47 07.32 -14 53 52.3 u 089
2013-01-24 19:23:03 C 07 47 06.74 -14 53 46.8 u 089
2013-01-24 19:25:54 C 07 47 06.14 -14 53 41.1 u 089
2013-01-24 19:31:36 C 07 47 04.97 -14 53 30.0 u 089
2013-01-24 19:34:27 C 07 47 04.41 -14 53 24.3 u 089
2013-01-24 19:37:18 C 07 47 03.83 -14 53 19.0 u 089
2013-01-24 19:40:09 C 07 47 03.24 -14 53 13.5 u 089
2013-01-24 19:43:00 C 07 47 02.66 -14 53 08.1 u 089
2013-01-24 19:45:51 C 07 47 02.08 -14 53 02.0 u 089
2013-01-24 19:48:42 C 07 47 01.50 -14 52 56.6 u 089
2013-01-24 19:51:33 C 07 47 00.94 -14 52 51.1 u 089
2013-01-24 19:54:24 C 07 47 00.35 -14 52 45.9 u 089
2013-01-24 19:57:15 C 07 46 59.76 -14 52 40.2 u 089
2013-01-24 19:58:58 C 07 46 53.64 -14 50 51.3 u D20
2013-01-24 19:59:24 C 07 46 53.57 -14 50 50.3 u D20
2013-01-24 19:59:51 C 07 46 53.49 -14 50 49.4 u D20
2013-01-24 20:00:06 C 07 46 59.18 -14 52 34.8 u 089
2013-01-24 20:00:54 C 07 46 59.00 -14 52 31.3 q B17
2013-01-24 20:02:57 C 07 46 58.61 -14 52 29.2 u 089
2013-01-24 20:03:53 C 07 46 58.38 -14 52 25.5 q B17
2013-01-24 20:05:48 C 07 46 58.02 -14 52 23.6 u 089
2013-01-24 20:06:53 C 07 46 57.78 -14 52 19.6 q B17
2013-01-24 20:09:54 C 07 46 57.16 -14 52 13.8 q B17
2013-01-24 20:12:53 C 07 46 56.53 -14 52 07.9 q B17
2013-01-24 20:44:25 C 07 46 50.07 -14 51 05.9 q B17
2013-01-24 20:47:24 C 07 46 49.48 -14 51 00.2 q B17
2013-01-24 20:50:24 C 07 46 48.85 -14 50 54.2 q B17
2013-01-24 20:53:25 C 07 46 48.24 -14 50 48.3 q B17
2013-01-24 20:56:24 C 07 46 47.62 -14 50 42.3 q B17
2013-01-24 21:20:45 C 07 46 42.22 -14 49 54.1 u C40
2013-01-24 21:21:49 C 07 46 41.98 -14 49 52.2 u C40
2013-01-24 21:23:21 C 07 46 41.67 -14 49 49.6 u C40
2013-01-24 21:24:52 C 07 46 41.34 -14 49 46.3 u C40
2013-01-24 21:26:23 C 07 46 41.04 -14 49 43.1 u C40
2013-01-24 21:27:38 C 07 46 41.21 -14 49 40.7 q B17
2013-01-24 21:27:55 C 07 46 40.74 -14 49 40.1 u C40
2013-01-24 21:29:26 C 07 46 40.43 -14 49 37.3 u C40
2013-01-24 21:30:37 C 07 46 40.59 -14 49 35.0 q B17
2013-01-24 21:33:39 C 07 46 39.95 -14 49 28.7 q B17
2013-01-24 21:34:00 C 07 46 39.51 -14 49 27.7 u C40
2013-01-24 21:39:38 C 07 46 38.77 -14 49 17.1 q B17
2013-01-24 22:10:35 C 07 46 32.40 -14 48 15.3 q B17
2013-01-25 12:58:33 C 07 43 52.17 -14 17 18.2 u D20
2013-01-25 12:58:59 C 07 43 52.09 -14 17 17.3 u D20
2013-01-25 12:59:26 C 07 43 52.00 -14 17 15.6 u D20
2013-01-25 13:58:41 C 07 43 40.12 -14 15 21.3 u D20
2013-01-25 13:59:07 C 07 43 40.03 -14 15 20.6 u D20
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)