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
2013-02-05 15:59:25 C 07 05 45.668 -05 36 54.42 q O44
2013-02-05 16:05:26 C 07 05 44.948 -05 36 43.39 q O44
2013-02-05 16:07:23 C 07 05 44.711 -05 36 39.76 q O44
2013-02-05 16:11:35 C 07 05 44.205 -05 36 32.02 q O44
2013-02-05 16:12:34 C 07 05 44.088 -05 36 30.25 q O44
2013-02-05 16:13:22 C 07 05 43.988 -05 36 28.70 q O44
2013-02-05 16:14:08 C 07 05 43.900 -05 36 27.35 q O44
2013-02-05 16:20:24 C 07 05 43.146 -05 36 15.78 q O44
2013-02-05 16:21:54 C 07 05 42.962 -05 36 12.93 q O44
2013-02-05 16:22:48 C 07 05 42.856 -05 36 11.34 q O44
2013-02-05 16:23:38 C 07 05 42.753 -05 36 09.78 q O44
2013-02-05 16:24:25 C 07 05 42.660 -05 36 08.33 q O44
2013-02-05 16:30:19 C 07 05 41.954 -05 35 57.46 q O44
2013-02-05 16:32:16 C 07 05 41.717 -05 35 53.82 q O44
2013-02-05 16:39:25 C 07 05 44.67 -05 35 55.9 q B17
2013-02-05 16:41:58 C 07 05 40.554 -05 35 35.90 q O44
2013-02-05 16:43:36 C 07 05 40.359 -05 35 32.87 q O44
2013-02-05 16:44:29 C 07 05 40.255 -05 35 31.24 q O44
2013-02-05 16:46:10 C 07 05 40.052 -05 35 28.13 q O44
2013-02-05 16:47:00 C 07 05 39.951 -05 35 26.57 q O44
2013-02-05 16:47:47 C 07 05 39.860 -05 35 25.17 q O44
2013-02-05 16:59:25 C 07 05 37.64 -05 33 55.9 u D20
2013-02-05 16:59:51 C 07 05 37.59 -05 33 55.2 u D20
2013-02-05 17:00:17 C 07 05 37.53 -05 33 54.3 u D20
2013-02-05 17:01:50 C 07 05 42.14 -05 35 15.0 q B17
2013-02-05 17:30:21 C 07 05 38.89 -05 34 22.8 q B17
2013-02-05 17:42:29 C 07 05 37.21 -05 34 00.8 u C40
2013-02-05 17:44:00 C 07 05 37.04 -05 33 58.0 u C40
2013-02-05 17:45:32 C 07 05 36.86 -05 33 55.2 u C40
2013-02-05 17:47:03 C 07 05 36.68 -05 33 52.4 u C40
2013-02-05 17:47:56 C 07 05 36.88 -05 33 52.0 q 089
2013-02-05 17:50:01 C 07 05 36.63 -05 33 48.2 q 089
2013-02-05 17:56:12 C 07 05 35.93 -05 33 36.8 q 089
2013-02-05 17:58:17 C 07 05 35.69 -05 33 33.2 q 089
2013-02-05 17:59:19 C 07 05 30.80 -05 32 04.6 u D20
2013-02-05 17:59:46 C 07 05 30.74 -05 32 03.9 u D20
2013-02-05 18:00:12 C 07 05 30.70 -05 32 03.1 u D20
2013-02-05 18:02:18 C 07 05 34.91 -05 33 24.3 u C40
2013-02-05 18:02:25 C 07 05 35.22 -05 33 25.7 q 089
2013-02-05 18:03:48 C 07 05 34.74 -05 33 21.8 u C40
2013-02-05 18:04:28 C 07 05 34.99 -05 33 21.6 q 089
2013-02-05 18:05:20 C 07 05 34.57 -05 33 18.9 u C40
2013-02-05 18:06:33 C 07 05 34.75 -05 33 18.0 q 089
2013-02-05 18:06:52 C 07 05 34.39 -05 33 15.9 u C40
2013-02-05 18:08:22 C 07 05 34.23 -05 33 13.4 u C40
2013-02-05 18:08:36 C 07 05 34.52 -05 33 14.3 q 089
2013-02-05 18:09:54 C 07 05 34.03 -05 33 10.3 u C40
2013-02-05 18:10:41 C 07 05 34.27 -05 33 10.4 q 089
2013-02-05 18:11:26 C 07 05 33.86 -05 33 07.9 u C40
2013-02-05 18:12:44 C 07 05 34.05 -05 33 06.9 q 089
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)