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
2007-01-25 14:02:56 C 15 49 24.619 -21 26 15.27 L 568
2007-01-25 14:07:45 C 15 49 25.448 -21 26 17.35 L 568
2007-01-25 14:11:08 C 15 49 26.056 -21 26 18.94 L 568
2007-01-25 14:14:31 C 15 49 26.638 -21 26 20.34 L 568
2007-01-25 14:17:55 C 15 49 27.232 -21 26 21.81 L 568
2007-01-25 14:21:19 C 15 49 27.836 -21 26 23.28 L 568
2007-01-25 14:24:42 C 15 49 28.426 -21 26 24.78 L 568
2007-01-25 14:28:17 C 15 49 29.040 -21 26 26.32 L 568
2007-01-25 14:31:41 C 15 49 29.635 -21 26 27.79 L 568
2007-01-25 14:35:04 C 15 49 30.217 -21 26 29.23 L 568
2007-01-25 14:39:02 C 15 49 30.921 -21 26 30.98 L 568
2007-01-25 14:42:26 C 15 49 31.515 -21 26 32.50 L 568
2007-01-25 14:45:48 C 15 49 32.099 -21 26 33.92 L 568
2007-01-25 14:49:23 C 15 49 32.743 -21 26 35.57 L 568
2007-01-25 14:52:51 C 15 49 33.333 -21 26 37.04 L 568
2007-01-25 14:56:14 C 15 49 33.920 -21 26 38.54 L 568
2007-01-25 14:59:48 C 15 49 34.551 -21 26 40.09 L 568
2007-01-25 15:03:11 C 15 49 35.141 -21 26 41.54 L 568
2007-01-25 15:06:33 C 15 49 35.721 -21 26 42.96 L 568
2007-01-25 15:10:20 C 15 49 36.378 -21 26 44.65 L 568
2007-01-25 15:13:43 C 15 49 36.980 -21 26 46.10 L 568
2007-01-25 15:17:05 C 15 49 37.574 -21 26 47.55 L 568
2007-01-25 15:20:40 C 15 49 38.186 -21 26 49.11 L 568
2007-01-25 15:24:04 C 15 49 38.758 -21 26 50.54 L 568
2007-01-25 15:27:39 C 15 49 39.407 -21 26 52.14 L 568
2007-01-25 15:31:02 C 15 49 39.998 -21 26 53.60 L 568
2007-01-25 15:34:40 C 15 49 40.623 -21 26 54.91 L 568
2007-03-09 15:42:00 C 19 16 36.695 -21 11 06.90 L 568
2007-03-09 15:45:13 C 19 16 37.371 -21 11 04.96 L 568
2007-12-13 15:51:25 C 14 26 35.206 -15 26 51.52 L 568
2008-01-06 15:20:05 C 16 03 51.245 -20 51 51.34 L 568
2008-01-06 15:30:17 C 16 03 53.080 -20 51 55.60 L 568
2008-01-06 15:35:15 C 16 03 53.986 -20 51 57.69 L 568
2008-01-06 15:40:12 C 16 03 54.887 -20 51 59.83 L 568
2008-01-06 15:45:25 C 16 03 55.801 -20 52 01.94 L 568
2008-01-06 15:50:24 C 16 03 56.765 -20 52 04.16 L 568
2008-01-06 15:55:25 C 16 03 57.618 -20 52 06.04 L 568
2008-01-07 15:24:10 C 16 08 14.721 -21 01 32.09 L 568
2008-01-07 15:29:04 C 16 08 15.608 -21 01 33.99 L 568
2008-01-07 15:40:06 C 16 08 17.617 -21 01 38.46 L 568
2008-01-07 15:45:39 C 16 08 18.608 -21 01 40.57 L 568
2008-01-08 15:41:51 C 16 12 42.234 -21 10 54.03 L 568
2008-01-08 15:45:57 C 16 12 42.968 -21 10 55.80 L 568
2008-01-08 15:49:17 C 16 12 43.584 -21 10 56.95 L 568
2008-01-08 15:55:54 C 16 12 44.803 -21 10 59.64 L 568
2008-01-08 15:58:41 C 16 12 45.323 -21 11 00.64 L 568
2008-01-09 15:34:53 C 16 17 06.855 -21 19 43.21 L 568
2008-01-09 15:37:40 C 16 17 07.315 -21 19 44.16 L 568
2008-01-09 15:40:31 C 16 17 07.868 -21 19 45.05 L 568
2008-01-09 15:43:19 C 16 17 08.370 -21 19 46.22 L 568
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)