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
2013-02-02 15:00:42 C 07 14 02.25 -07 53 19.3 u D20
2013-02-02 16:59:45 C 07 13 45.49 -07 49 28.8 u D20
2013-02-02 17:00:10 C 07 13 45.43 -07 49 27.9 u D20
2013-02-02 17:00:37 C 07 13 45.37 -07 49 27.0 u D20
2013-02-02 18:36:07 C 07 13 37.06 -07 47 51.3 u C40
2013-02-02 18:38:49 C 07 13 36.70 -07 47 46.3 u C40
2013-02-02 18:40:20 C 07 13 36.49 -07 47 43.3 u C40
2013-02-02 18:41:51 C 07 13 36.28 -07 47 40.4 u C40
2013-02-02 18:44:34 C 07 13 35.90 -07 47 35.1 u C40
2013-02-02 18:46:06 C 07 13 35.69 -07 47 32.4 u C40
2013-02-02 18:47:38 C 07 13 35.47 -07 47 29.3 u C40
2013-02-02 18:49:48 C 07 13 35.18 -07 47 25.2 u C40
2013-02-02 18:51:19 C 07 13 34.97 -07 47 22.3 u C40
2013-02-02 18:52:50 C 07 13 34.76 -07 47 19.3 u C40
2013-02-02 18:54:22 C 07 13 34.56 -07 47 16.4 u C40
2013-02-02 18:55:54 C 07 13 34.34 -07 47 13.5 u C40
2013-02-02 18:57:25 C 07 13 34.14 -07 47 10.6 u C40
2013-02-02 18:58:57 C 07 13 33.92 -07 47 07.8 u C40
2013-02-02 19:00:27 C 07 13 33.70 -07 47 04.8 u C40
2013-02-02 19:01:59 C 07 13 33.51 -07 47 01.8 u C40
2013-02-02 19:03:31 C 07 13 33.30 -07 46 58.9 u C40
2013-02-02 19:05:02 C 07 13 33.08 -07 46 55.9 u C40
2013-02-02 19:06:34 C 07 13 32.86 -07 46 53.0 u C40
2013-02-02 19:08:05 C 07 13 32.67 -07 46 50.5 u C40
2013-02-02 19:15:42 C 07 13 31.61 -07 46 35.6 u C40
2013-02-02 19:17:13 C 07 13 31.41 -07 46 32.9 u C40
2013-02-02 19:18:45 C 07 13 31.20 -07 46 29.8 u C40
2013-02-02 21:47:48 C 07 13 10.75 -07 41 42.5 u C40
2013-02-02 21:49:20 C 07 13 10.55 -07 41 39.9 u C40
2013-02-02 21:50:51 C 07 13 10.37 -07 41 36.9 u C40
2013-02-02 21:52:22 C 07 13 10.13 -07 41 33.9 u C40
2013-02-02 21:53:42 C 07 13 12.24 -07 41 36.7 q J84
2013-02-02 21:55:25 C 07 13 09.73 -07 41 28.1 u C40
2013-02-02 22:02:32 C 07 13 11.06 -07 41 20.0 q J84
2013-02-02 22:11:21 C 07 13 09.86 -07 41 03.2 q J84
2013-02-02 22:15:15 C 07 13 07.10 -07 40 49.5 u C40
2013-02-02 22:20:10 C 07 13 08.68 -07 40 46.0 q J84
2013-02-03 03:29:01 C 07 12 32.26 -07 30 41.6 q H45
2013-02-03 03:33:36 C 07 12 31.70 -07 30 33.9 q H45
2013-02-03 03:34:50 C 07 12 31.45 -07 30 30.5 q H45
2013-02-03 03:36:12 C 07 12 31.27 -07 30 27.8 q H45
2013-02-03 03:37:31 C 07 12 31.09 -07 30 25.3 q H45
2013-02-03 03:38:39 C 07 12 30.94 -07 30 23.2 q H45
2013-02-03 03:39:57 C 07 12 30.77 -07 30 20.6 q H45
2013-02-03 03:40:40 C 07 12 30.68 -07 30 19.7 q H45
2013-02-03 12:58:39 C 07 11 25.10 -07 11 17.0 u D20
2013-02-03 12:59:05 C 07 11 25.05 -07 11 16.2 u D20
2013-02-03 12:59:32 C 07 11 24.99 -07 11 15.4 u D20
2013-02-03 14:00:00 C 07 11 16.85 -07 09 21.0 u D20
2013-02-03 14:00:28 C 07 11 16.79 -07 09 20.1 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)