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
2013-02-04 15:50:52 C 07 08 19.849 -06 21 44.17 q O44
2013-02-04 15:51:27 C 07 08 19.777 -06 21 43.14 q O44
2013-02-04 15:52:01 C 07 08 19.703 -06 21 42.05 q O44
2013-02-04 15:52:36 C 07 08 19.628 -06 21 40.92 q O44
2013-02-04 15:53:16 C 07 08 19.544 -06 21 39.72 q O44
2013-02-04 15:53:51 C 07 08 19.469 -06 21 38.59 q O44
2013-02-04 15:54:25 C 07 08 19.394 -06 21 37.53 q O44
2013-02-04 15:55:00 C 07 08 19.321 -06 21 36.45 q O44
2013-02-04 15:55:35 C 07 08 19.246 -06 21 35.38 q O44
2013-02-04 15:56:16 C 07 08 19.159 -06 21 34.11 q O44
2013-02-04 15:56:50 C 07 08 19.082 -06 21 32.98 q O44
2013-02-04 15:57:25 C 07 08 19.011 -06 21 31.92 q O44
2013-02-04 15:58:00 C 07 08 18.936 -06 21 30.83 q O44
2013-02-04 16:00:03 C 07 08 18.671 -06 21 26.96 q O44
2013-02-04 16:01:14 C 07 08 18.521 -06 21 24.77 q O44
2013-02-04 16:03:16 C 07 08 18.258 -06 21 20.93 q O44
2013-02-04 16:03:56 C 07 08 18.175 -06 21 19.72 q O44
2013-02-04 16:04:35 C 07 08 18.091 -06 21 18.47 q O44
2013-02-04 16:05:15 C 07 08 18.005 -06 21 17.22 q O44
2013-02-04 16:05:55 C 07 08 17.921 -06 21 16.01 q O44
2013-02-04 16:06:40 C 07 08 17.826 -06 21 14.59 q O44
2013-02-04 16:07:20 C 07 08 17.740 -06 21 13.35 q O44
2013-02-04 16:07:59 C 07 08 17.655 -06 21 12.10 q O44
2013-02-04 16:08:39 C 07 08 17.571 -06 21 10.86 q O44
2013-02-04 16:09:18 C 07 08 17.486 -06 21 09.66 q O44
2013-02-04 16:10:03 C 07 08 17.390 -06 21 08.21 q O44
2013-02-04 16:10:43 C 07 08 17.308 -06 21 06.99 q O44
2013-02-04 16:11:23 C 07 08 17.221 -06 21 05.68 q O44
2013-02-04 16:12:03 C 07 08 17.139 -06 21 04.53 q O44
2013-02-04 16:12:42 C 07 08 17.052 -06 21 03.25 q O44
2013-02-04 16:15:22 C 07 08 16.711 -06 20 58.22 q O44
2013-02-04 16:16:02 C 07 08 16.628 -06 20 56.99 q O44
2013-02-04 16:16:49 C 07 08 16.527 -06 20 55.53 q O44
2013-02-04 16:17:29 C 07 08 16.443 -06 20 54.25 q O44
2013-02-04 16:18:09 C 07 08 16.357 -06 20 53.02 q O44
2013-02-04 16:18:48 C 07 08 16.272 -06 20 51.78 q O44
2013-02-04 16:19:28 C 07 08 16.187 -06 20 50.53 q O44
2013-02-04 16:20:10 C 07 08 16.100 -06 20 49.25 q O44
2013-02-04 16:20:50 C 07 08 16.014 -06 20 47.99 q O44
2013-02-04 16:21:29 C 07 08 15.931 -06 20 46.77 q O44
2013-02-04 16:22:09 C 07 08 15.846 -06 20 45.51 q O44
2013-02-04 16:23:31 C 07 08 15.672 -06 20 42.95 q O44
2013-02-04 16:24:10 C 07 08 15.588 -06 20 41.73 q O44
2013-02-04 16:24:50 C 07 08 15.504 -06 20 40.50 q O44
2013-02-04 16:25:29 C 07 08 15.421 -06 20 39.24 q O44
2013-02-04 16:26:09 C 07 08 15.337 -06 20 38.00 q O44
2013-02-04 16:26:50 C 07 08 15.247 -06 20 36.71 q O44
2013-02-04 16:27:30 C 07 08 15.161 -06 20 35.48 q O44
2013-02-04 16:28:10 C 07 08 15.078 -06 20 34.24 q O44
2013-02-04 16:29:29 C 07 08 14.909 -06 20 31.73 q O44
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)