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
2013-01-18 16:57:45 C 08 17 30.20 -19 27 29.5 u D20
2013-01-18 16:58:11 C 08 17 30.10 -19 27 28.9 u D20
2013-01-18 16:59:36 C 08 17 29.75 -19 27 26.4 u D20
2013-01-18 17:00:02 C 08 17 29.64 -19 27 25.6 u D20
2013-01-18 17:00:29 C 08 17 29.53 -19 27 24.8 u D20
2013-01-18 17:06:06 C 08 17 28.13 -19 27 14.9 u D20
2013-01-18 17:06:32 C 08 17 28.01 -19 27 14.1 u D20
2013-01-18 17:06:59 C 08 17 27.89 -19 27 13.3 u D20
2013-01-18 17:23:03 C 08 17 23.91 -19 26 45.2 u D20
2013-01-18 17:23:29 C 08 17 23.80 -19 26 44.4 u D20
2013-01-18 17:23:57 C 08 17 23.68 -19 26 43.5 u D20
2013-01-19 15:59:22 C 08 12 23.12 -18 46 41.0 u D20
2013-01-19 15:59:48 C 08 12 23.01 -18 46 40.2 u D20
2013-01-19 16:00:14 C 08 12 22.90 -18 46 39.4 u D20
2013-01-19 16:01:50 C 08 12 22.51 -18 46 36.6 u D20
2013-01-19 16:02:17 C 08 12 22.41 -18 46 35.8 u D20
2013-01-19 16:02:43 C 08 12 22.30 -18 46 35.0 u D20
2013-01-19 16:41:19 C 08 12 12.89 -18 45 25.8 u D20
2013-01-19 16:41:46 C 08 12 12.78 -18 45 25.0 u D20
2013-01-19 16:42:14 C 08 12 12.68 -18 45 24.3 u D20
2013-01-19 16:59:38 C 08 12 08.44 -18 44 52.7 u D20
2013-01-19 17:00:04 C 08 12 08.33 -18 44 51.9 u D20
2013-01-19 17:00:31 C 08 12 08.23 -18 44 51.0 u D20
2013-01-19 19:26:39 C 08 11 40.07 -18 41 55.2 o 071
2013-01-19 19:27:54 C 08 11 39.77 -18 41 53.4 o 071
2013-01-19 19:28:59 C 08 11 39.56 -18 41 52.1 o 071
2013-01-19 19:30:16 C 08 11 39.25 -18 41 49.4 o 071
2013-01-19 19:31:20 C 08 11 39.01 -18 41 47.0 o 071
2013-01-19 19:32:37 C 08 11 38.71 -18 41 45.5 o 071
2013-01-19 19:33:41 C 08 11 38.43 -18 41 43.0 o 071
2013-01-19 19:34:57 C 08 11 38.17 -18 41 41.0 o 071
2013-01-19 19:36:02 C 08 11 37.92 -18 41 38.4 o 071
2013-01-19 19:37:18 C 08 11 37.60 -18 41 37.2 o 071
2013-01-19 19:38:23 C 08 11 37.34 -18 41 35.7 o 071
2013-01-19 19:39:39 C 08 11 37.10 -18 41 33.2 o 071
2013-01-19 19:40:45 C 08 11 36.85 -18 41 31.8 o 071
2013-01-19 19:47:47 C 08 11 35.18 -18 41 18.2 o 071
2013-01-19 19:49:03 C 08 11 34.85 -18 41 16.7 o 071
2013-01-19 19:50:09 C 08 11 34.60 -18 41 14.5 o 071
2013-01-19 19:51:25 C 08 11 34.30 -18 41 12.7 o 071
2013-01-19 19:52:30 C 08 11 34.00 -18 41 10.5 o 071
2013-01-19 19:53:47 C 08 11 33.75 -18 41 08.6 o 071
2013-01-19 19:54:51 C 08 11 33.46 -18 41 06.2 o 071
2013-01-19 19:56:08 C 08 11 33.17 -18 41 04.5 o 071
2013-01-19 19:56:14 C 08 11 26.11 -18 39 25.7 u D20
2013-01-19 19:56:40 C 08 11 26.01 -18 39 24.8 u D20
2013-01-19 19:57:06 C 08 11 25.90 -18 39 23.9 u D20
2013-01-19 19:57:12 C 08 11 32.91 -18 41 02.6 o 071
2013-01-19 19:58:28 C 08 11 32.62 -18 41 00.2 o 071
2013-01-19 19:59:33 C 08 11 32.33 -18 40 57.7 o 071
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)