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
2013-01-04 17:59:13 C 09 38 04.51 -26 14 05.9 o 300
2013-01-04 18:00:06 C 09 38 04.27 -26 14 05.1 o 300
2013-01-04 18:00:57 C 09 38 04.05 -26 14 04.7 o 300
2013-01-05 00:52:37 C 09 36 28.26 -26 09 46.7 v 470
2013-01-05 00:53:41 C 09 36 28.00 -26 09 46.1 v 470
2013-01-05 00:54:44 C 09 36 27.72 -26 09 45.5 v 470
2013-01-08 01:14:51 C 09 19 04.70 -25 13 59.9 u J38
2013-01-08 01:15:30 C 09 19 04.53 -25 13 59.4 u J38
2013-01-08 01:16:50 C 09 19 04.17 -25 13 58.2 u J38
2013-01-08 01:21:25 C 09 19 02.97 -25 13 54.3 u J38
2013-01-08 01:23:22 C 09 19 02.44 -25 13 52.8 u J38
2013-01-08 01:24:01 C 09 19 02.28 -25 13 52.1 u J38
2013-01-08 01:25:20 C 09 19 01.93 -25 13 51.0 u J38
2013-01-08 01:30:33 C 09 19 00.55 -25 13 46.3 u J38
2013-01-08 01:34:35 C 09 18 59.49 -25 13 42.9 u J38
2013-01-08 01:36:32 C 09 18 58.98 -25 13 41.4 u J38
2013-01-08 01:38:32 C 09 18 58.43 -25 13 39.3 u J38
2013-01-08 01:39:11 C 09 18 58.27 -25 13 38.7 u J38
2013-01-08 01:42:28 C 09 18 57.40 -25 13 36.0 u J38
2013-01-08 10:44:04 C 09 16 46.97 -25 04 57.3 t F65
2013-01-08 10:45:24 C 09 16 46.64 -25 04 56.1 t F65
2013-01-08 10:46:46 C 09 16 46.25 -25 04 54.8 t F65
2013-01-08 10:48:06 C 09 16 45.91 -25 04 53.7 t F65
2013-01-08 10:50:16 C 09 16 45.32 -25 04 51.9 t F65
2013-01-08 10:51:28 C 09 16 45.00 -25 04 50.9 t F65
2013-01-08 10:52:49 C 09 16 44.62 -25 04 49.6 t F65
2013-01-08 10:54:38 C 09 16 44.14 -25 04 48.2 t F65
2013-01-08 11:32:11 C 09 16 34.01 -25 04 15.1 o F65
2013-01-08 11:33:32 C 09 16 33.65 -25 04 13.9 o F65
2013-01-08 11:37:44 C 09 16 32.51 -25 04 10.1 o F65
2013-01-08 11:40:33 C 09 16 31.74 -25 04 07.5 o F65
2013-01-08 11:43:27 C 09 16 30.96 -25 04 04.9 o F65
2013-01-08 11:44:50 C 09 16 30.59 -25 04 03.7 o F65
2013-01-08 11:45:49 C 09 16 34.34 -25 02 29.4 o E10
2013-01-08 11:47:36 C 09 16 29.83 -25 04 01.2 o F65
2013-01-08 11:48:45 C 09 16 33.61 -25 02 27.2 o E10
2013-01-08 11:50:06 C 09 16 33.26 -25 02 26.1 o E10
2013-01-08 11:50:24 C 09 16 29.06 -25 03 58.6 o F65
2013-01-08 11:51:48 C 09 16 28.68 -25 03 57.3 o F65
2013-01-08 11:53:13 C 09 16 28.30 -25 03 56.0 o F65
2013-01-08 11:54:40 C 09 16 27.91 -25 03 54.7 o F65
2013-01-08 11:56:04 C 09 16 27.53 -25 03 53.5 o F65
2013-01-08 11:56:40 C 09 16 31.58 -25 02 20.7 o E10
2013-01-08 23:49:41 C 09 13 32.67 -24 52 47.6 o 071
2013-01-09 00:01:04 C 09 13 29.75 -24 52 37.4 o 071
2013-01-09 00:04:07 C 09 13 28.92 -24 52 33.9 o 071
2013-01-09 00:07:47 C 09 13 27.90 -24 52 30.6 o 071
2013-01-09 00:09:38 C 09 13 27.42 -24 52 28.3 o 071
2013-01-09 00:11:27 C 09 13 26.91 -24 52 26.7 o 071
2013-01-09 00:12:23 C 09 13 26.69 -24 52 25.7 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)