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
2006-12-26 15:54:38 C 13 55 00.066 -14 18 08.04 L 568
2006-12-27 14:43:50 C 13 58 18.687 -14 34 30.21 L 568
2006-12-27 14:47:13 C 13 58 19.180 -14 34 32.59 L 568
2006-12-27 14:50:35 C 13 58 19.669 -14 34 35.08 L 568
2006-12-27 14:54:07 C 13 58 20.171 -14 34 37.59 L 568
2006-12-27 14:57:44 C 13 58 20.692 -14 34 40.16 L 568
2006-12-27 15:04:30 C 13 58 21.676 -14 34 45.11 L 568
2006-12-27 15:07:53 C 13 58 22.157 -14 34 47.55 L 568
2006-12-27 15:11:16 C 13 58 22.638 -14 34 49.94 L 568
2006-12-27 15:14:55 C 13 58 23.164 -14 34 52.56 L 568
2006-12-27 15:18:19 C 13 58 23.654 -14 34 55.02 L 568
2006-12-27 15:21:51 C 13 58 24.160 -14 34 57.58 L 568
2006-12-27 15:25:13 C 13 58 24.633 -14 34 59.93 L 568
2006-12-27 15:28:36 C 13 58 25.128 -14 35 02.41 L 568
2006-12-27 15:32:10 C 13 58 25.643 -14 35 05.02 L 568
2006-12-27 15:35:32 C 13 58 26.118 -14 35 07.34 L 568
2006-12-27 15:39:09 C 13 58 26.645 -14 35 10.02 L 568
2006-12-27 15:42:32 C 13 58 27.136 -14 35 12.46 L 568
2006-12-27 15:45:59 C 13 58 27.617 -14 35 14.94 L 568
2006-12-27 15:49:17 C 13 58 28.080 -14 35 17.27 L 568
2006-12-27 15:52:43 C 13 58 28.593 -14 35 19.73 L 568
2006-12-28 14:22:27 C 14 01 45.532 -14 51 20.18 L 568
2006-12-28 14:25:49 C 14 01 45.990 -14 51 22.22 L 568
2006-12-28 14:29:12 C 14 01 46.474 -14 51 24.86 L 568
2006-12-28 14:32:34 C 14 01 46.965 -14 51 27.09 L 568
2006-12-28 14:36:01 C 14 01 47.466 -14 51 29.59 L 568
2006-12-28 14:39:22 C 14 01 47.954 -14 51 31.93 L 568
2006-12-28 14:42:55 C 14 01 48.465 -14 51 34.53 L 568
2006-12-28 14:46:17 C 14 01 48.954 -14 51 36.90 L 568
2006-12-28 14:49:39 C 14 01 49.441 -14 51 39.29 L 568
2006-12-28 14:53:29 C 14 01 49.989 -14 51 42.06 L 568
2006-12-28 14:56:53 C 14 01 50.480 -14 51 44.43 L 568
2006-12-28 15:00:18 C 14 01 50.990 -14 51 46.97 L 568
2006-12-28 15:03:41 C 14 01 51.480 -14 51 49.37 L 568
2006-12-28 15:07:03 C 14 01 51.941 -14 51 51.72 L 568
2006-12-28 15:10:25 C 14 01 52.447 -14 51 54.12 L 568
2006-12-28 15:13:59 C 14 01 52.958 -14 51 56.69 L 568
2006-12-28 15:17:25 C 14 01 53.453 -14 51 59.27 L 568
2006-12-28 15:20:59 C 14 01 53.965 -14 52 01.62 L 568
2006-12-28 15:24:47 C 14 01 54.514 -14 52 04.38 L 568
2006-12-28 15:28:22 C 14 01 55.039 -14 52 06.96 L 568
2006-12-28 15:31:45 C 14 01 55.531 -14 52 09.35 L 568
2006-12-28 15:35:07 C 14 01 55.996 -14 52 11.67 L 568
2006-12-28 15:38:31 C 14 01 56.494 -14 52 14.11 L 568
2006-12-28 15:41:54 C 14 01 57.003 -14 52 16.60 L 568
2006-12-28 15:45:17 C 14 01 57.472 -14 52 18.98 L 568
2006-12-28 15:48:40 C 14 01 57.960 -14 52 21.42 L 568
2007-01-21 13:58:44 C 15 32 42.616 -20 42 32.51 L 568
2007-01-21 14:02:04 C 15 32 43.182 -20 42 34.17 L 568
2007-01-21 14:05:26 C 15 32 43.754 -20 42 35.81 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)