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
2006-03-08 13:16:42 C 16 36 00.314 -26 46 51.64 L 568
2006-03-08 13:19:06 C 16 36 00.797 -26 46 52.06 L 568
2006-03-08 13:21:27 C 16 36 01.305 -26 46 52.45 L 568
2006-03-08 13:23:48 C 16 36 01.809 -26 46 52.76 L 568
2006-03-08 13:26:23 C 16 36 02.337 -26 46 53.31 L 568
2006-03-08 13:28:46 C 16 36 02.824 -26 46 53.65 L 568
2006-03-08 13:31:10 C 16 36 03.321 -26 46 54.00 L 568
2006-03-08 13:34:01 C 16 36 03.925 -26 46 54.53 L 568
2006-03-08 13:36:33 C 16 36 04.447 -26 46 54.94 L 568
2006-03-08 13:38:55 C 16 36 04.934 -26 46 55.29 L 568
2006-03-08 13:41:17 C 16 36 05.423 -26 46 55.67 L 568
2006-03-08 13:43:49 C 16 36 05.964 -26 46 56.10 L 568
2006-03-08 13:46:11 C 16 36 06.447 -26 46 56.43 L 568
2006-03-08 13:53:26 C 16 36 07.950 -26 46 57.62 L 568
2006-03-08 13:55:49 C 16 36 08.453 -26 46 57.97 L 568
2006-03-08 14:16:53 C 16 36 12.824 -26 47 01.24 L 568
2006-03-08 14:19:23 C 16 36 13.342 -26 47 01.59 L 568
2006-03-08 14:21:44 C 16 36 13.834 -26 47 01.97 L 568
2006-03-08 14:24:06 C 16 36 14.327 -26 47 02.20 L 568
2006-03-08 14:26:32 C 16 36 14.819 -26 47 02.62 L 568
2006-03-08 14:28:55 C 16 36 15.335 -26 47 03.00 L 568
2006-03-08 14:31:17 C 16 36 15.804 -26 47 03.30 L 568
2006-03-08 14:33:41 C 16 36 16.308 -26 47 03.66 L 568
2006-03-08 14:36:05 C 16 36 16.812 -26 47 04.07 L 568
2006-03-08 14:38:40 C 16 36 17.347 -26 47 04.43 L 568
2006-03-08 14:40:59 C 16 36 17.821 -26 47 04.73 L 568
2006-03-08 14:43:31 C 16 36 18.338 -26 47 05.15 L 568
2006-03-08 14:45:55 C 16 36 18.848 -26 47 05.46 L 568
2006-03-08 14:48:30 C 16 36 19.384 -26 47 05.80 L 568
2006-03-08 14:51:05 C 16 36 19.911 -26 47 06.18 L 568
2006-03-08 14:53:26 C 16 36 20.397 -26 47 06.50 L 568
2006-03-08 14:55:49 C 16 36 20.893 -26 47 06.83 L 568
2006-03-08 14:58:10 C 16 36 21.391 -26 47 07.18 L 568
2006-03-08 15:00:44 C 16 36 21.915 -26 47 07.56 L 568
2006-03-08 15:03:07 C 16 36 22.403 -26 47 07.90 L 568
2006-03-08 15:05:58 C 16 36 23.003 -26 47 08.29 L 568
2006-03-08 15:08:24 C 16 36 23.503 -26 47 08.58 L 568
2006-03-08 15:10:46 C 16 36 23.992 -26 47 08.94 L 568
2006-03-08 15:13:06 C 16 36 24.477 -26 47 09.24 L 568
2006-03-08 15:15:40 C 16 36 24.997 -26 47 09.59 L 568
2006-03-08 15:18:02 C 16 36 25.500 -26 47 09.91 L 568
2006-03-08 15:20:24 C 16 36 25.991 -26 47 10.23 L 568
2006-03-08 15:22:47 C 16 36 26.480 -26 47 10.54 L 568
2006-03-08 15:25:23 C 16 36 27.008 -26 47 10.89 L 568
2006-03-08 15:27:47 C 16 36 27.506 -26 47 11.22 L 568
2006-03-08 15:30:04 C 16 36 27.988 -26 47 11.49 L 568
2006-03-08 15:32:25 C 16 36 28.476 -26 47 11.82 L 568
2006-03-08 15:34:59 C 16 36 29.008 -26 47 12.13 L 568
2006-03-08 15:37:22 C 16 36 29.492 -26 47 12.45 L 568
2006-03-08 15:51:53 C 16 36 32.496 -26 47 14.31 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)