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
2013-03-05 03:28:26 C 06 46 33.36 +09 15 56.1 q H45
2013-03-05 06:02:54 C 06 46 38.113 +09 18 27.93 t F65
2013-03-05 06:05:29 C 06 46 38.149 +09 18 30.28 t F65
2013-03-05 10:54:14 C 06 46 45.11 +09 22 43.2 o 300
2013-03-05 10:56:42 C 06 46 45.14 +09 22 45.5 o 300
2013-03-05 10:59:02 C 06 46 45.18 +09 22 47.8 o 300
2013-03-05 11:01:22 C 06 46 45.21 +09 22 49.4 o 300
2013-03-05 11:21:24 C 06 46 45.48 +09 23 07.7 o 300
2013-03-05 11:23:45 C 06 46 45.52 +09 23 09.5 o 300
2013-03-05 11:26:05 C 06 46 45.56 +09 23 11.9 o 300
2013-03-05 11:28:25 C 06 46 45.60 +09 23 14.1 o 300
2013-03-05 11:30:46 C 06 46 45.63 +09 23 16.2 o 300
2013-03-05 11:33:06 C 06 46 45.67 +09 23 18.5 o 300
2013-03-05 11:35:27 C 06 46 45.69 +09 23 20.5 o 300
2013-03-05 11:37:47 C 06 46 45.74 +09 23 22.7 o 300
2013-03-05 11:40:08 C 06 46 45.76 +09 23 24.9 o 300
2013-03-05 11:42:28 C 06 46 45.81 +09 23 27.2 o 300
2013-03-05 20:41:39 C 06 46 59.08 +09 31 22.7 u C01
2013-03-05 20:47:03 C 06 46 59.19 +09 31 27.4 u C01
2013-03-05 20:52:25 C 06 46 59.28 +09 31 31.9 u C01
2013-03-05 20:57:49 C 06 46 59.39 +09 31 36.8 u C01
2013-03-05 21:03:13 C 06 46 59.47 +09 31 41.7 u C01
2013-03-05 21:29:13 C 06 46 59.62 +09 32 04.6 u 585
2013-03-05 21:31:14 C 06 46 59.64 +09 32 05.8 u 585
2013-03-05 21:37:41 C 06 46 59.78 +09 32 11.8 u 585
2013-03-05 21:39:43 C 06 46 59.82 +09 32 13.3 u 585
2013-03-05 21:41:44 C 06 46 59.86 +09 32 15.4 u 585
2013-03-05 21:43:45 C 06 46 59.91 +09 32 17.1 u 585
2013-03-05 21:45:46 C 06 46 59.94 +09 32 19.2 u 585
2013-03-05 21:51:51 C 06 47 00.07 +09 32 24.3 u 585
2013-03-05 21:53:52 C 06 47 00.11 +09 32 26.1 u 585
2013-03-05 21:55:53 C 06 47 00.17 +09 32 27.5 u 585
2013-03-05 21:59:55 C 06 47 00.28 +09 32 31.8 u 585
2013-03-05 22:01:56 C 06 47 00.33 +09 32 33.3 u 585
2013-03-05 22:03:57 C 06 47 00.38 +09 32 34.9 u 585
2013-03-06 17:52:40 C 06 47 34.08 +09 50 10.4 u 585
2013-03-06 17:54:41 C 06 47 34.08 +09 50 12.1 u 585
2013-03-06 17:56:42 C 06 47 34.14 +09 50 13.8 u 585
2013-03-06 18:00:44 C 06 47 34.22 +09 50 17.3 u 585
2013-03-06 18:02:45 C 06 47 34.25 +09 50 19.3 u 585
2013-03-06 18:04:46 C 06 47 34.29 +09 50 20.9 u 585
2013-03-06 18:08:48 C 06 47 34.37 +09 50 24.7 u 585
2013-03-06 18:10:50 C 06 47 34.41 +09 50 26.4 u 585
2013-03-06 18:19:22 C 06 47 34.58 +09 50 33.7 u 585
2013-03-06 18:21:23 C 06 47 34.63 +09 50 35.3 u 585
2013-03-06 18:23:24 C 06 47 34.68 +09 50 37.4 u 585
2013-03-07 05:33:35 C 06 47 54.641 +10 00 39.30 t F65
2013-03-07 05:36:08 C 06 47 54.688 +10 00 41.50 t F65
2013-03-08 03:29:06 C 06 48 33.26 +10 19 10.6 q H45
2013-03-08 03:31:32 C 06 48 33.33 +10 19 12.7 q H45
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)