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
2005-07-11 04:04:24 C 10 35 36.698 +16 24 46.68 L 695
2005-07-11 04:09:29 C 10 35 36.755 +16 24 48.09 o 695
2005-07-11 04:13:36 C 10 35 36.829 +16 24 49.21 o 695
2005-09-04 15:14:40 C 08 25 00.085 +22 18 13.02 L 568
2005-09-04 15:16:13 C 08 25 00.075 +22 18 12.36 L 568
2005-10-07 11:48:54 C 09 11 11.86 +14 07 46.5 r G96
2005-10-07 11:51:38 C 09 11 12.12 +14 07 44.9 r G96
2005-10-07 11:54:23 C 09 11 12.37 +14 07 42.9 r G96
2005-10-07 11:57:08 C 09 11 12.66 +14 07 41.0 r G96
2005-10-18 14:53:15 C 09 37 56.05 +10 57 57.5 c F65
2005-10-18 14:54:46 C 09 37 56.24 +10 57 56.1 c F65
2005-10-18 14:56:16 C 09 37 56.36 +10 57 55.2 c F65
2005-10-29 12:11:42 C 10 05 17.85 +07 43 14.1 r G96
2005-10-29 12:15:29 C 10 05 18.23 +07 43 11.2 r G96
2005-10-29 12:19:16 C 10 05 18.64 +07 43 08.1 r G96
2005-12-07 09:41:49 C 11 44 04.92 -04 24 35.0 r 932
2005-12-07 10:10:44 C 11 44 07.88 -04 24 59.1 r 932
2005-12-07 10:40:19 C 11 44 10.95 -04 25 22.1 r 932
2005-12-31 12:23:01 C 12 46 07.75 -11 47 14.9 c 711
2005-12-31 12:32:51 C 12 46 08.78 -11 47 23.0 c 711
2005-12-31 12:42:40 C 12 46 09.78 -11 47 30.4 c 711
2005-12-31 15:30:12 C 12 46 28.407 -11 49 33.02 L 568
2005-12-31 15:31:52 C 12 46 28.583 -11 49 34.23 L 568
2005-12-31 15:33:07 C 12 46 28.708 -11 49 35.16 L 568
2006-01-25 10:51:04 C 13 55 17.86 -18 48 31.2 r 734
2006-01-25 10:58:47 C 13 55 18.78 -18 48 36.3 r 734
2006-01-25 11:05:08 C 13 55 19.50 -18 48 40.4 r 734
2006-01-27 12:01:58 C 14 01 26.50 -19 20 34.2 r G96
2006-01-27 12:09:12 C 14 01 27.40 -19 20 38.8 r G96
2006-01-27 12:16:29 C 14 01 28.27 -19 20 43.8 r G96
2006-03-05 13:06:46 C 16 20 49.786 -26 34 29.32 L 568
2006-03-05 14:39:09 C 16 21 07.957 -26 34 51.45 L 568
2006-03-05 15:39:50 C 16 21 19.828 -26 35 04.75 L 568
2006-03-06 12:28:35 C 16 25 39.350 -26 39 07.23 L 568
2006-03-06 12:31:01 C 16 25 39.838 -26 39 07.85 L 568
2006-03-06 12:33:23 C 16 25 40.319 -26 39 08.38 L 568
2006-03-06 12:35:45 C 16 25 40.802 -26 39 08.75 L 568
2006-03-06 12:38:09 C 16 25 41.288 -26 39 09.42 L 568
2006-03-06 12:45:24 C 16 25 42.744 -26 39 11.09 L 568
2006-03-06 12:47:46 C 16 25 43.230 -26 39 11.64 L 568
2006-03-06 12:54:30 C 16 25 44.576 -26 39 13.17 L 568
2006-03-06 12:56:53 C 16 25 45.058 -26 39 13.71 L 568
2006-03-06 12:59:14 C 16 25 45.528 -26 39 14.25 L 568
2006-03-06 13:01:37 C 16 25 46.018 -26 39 14.75 L 568
2006-03-06 13:04:13 C 16 25 46.542 -26 39 15.35 L 568
2006-03-06 13:06:34 C 16 25 47.020 -26 39 15.82 L 568
2006-03-06 13:08:57 C 16 25 47.487 -26 39 16.37 L 568
2006-03-06 13:11:28 C 16 25 48.001 -26 39 16.97 L 568
2006-03-06 13:13:51 C 16 25 48.473 -26 39 17.49 L 568
2006-03-06 13:16:14 C 16 25 48.954 -26 39 18.02 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)