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
2007-01-22 15:22:58 C 15 37 04.663 -20 54 38.24 L 568
2007-01-22 15:26:20 C 15 37 05.241 -20 54 39.79 L 568
2007-01-22 15:29:42 C 15 37 05.805 -20 54 41.42 L 568
2007-01-22 15:33:04 C 15 37 06.399 -20 54 43.05 L 568
2007-01-22 15:36:26 C 15 37 06.975 -20 54 44.58 L 568
2007-01-22 15:43:29 C 15 37 08.177 -20 54 48.01 L 568
2007-01-22 15:47:02 C 15 37 08.765 -20 54 49.68 L 568
2007-01-22 15:50:24 C 15 37 09.346 -20 54 51.23 L 568
2007-01-22 15:53:46 C 15 37 09.914 -20 54 52.83 L 568
2007-01-24 13:55:05 C 15 45 10.267 -21 15 47.20 L 568
2007-01-24 13:58:37 C 15 45 10.845 -21 15 48.76 L 568
2007-01-24 14:02:01 C 15 45 11.459 -21 15 50.79 L 568
2007-01-24 14:05:23 C 15 45 12.051 -21 15 52.00 L 568
2007-01-24 14:08:46 C 15 45 12.639 -21 15 53.62 L 568
2007-01-24 14:12:11 C 15 45 13.201 -21 15 55.01 L 568
2007-01-24 14:15:34 C 15 45 13.810 -21 15 56.62 L 568
2007-01-24 14:18:57 C 15 45 14.398 -21 15 58.15 L 568
2007-01-24 14:22:20 C 15 45 14.981 -21 15 59.67 L 568
2007-01-24 14:25:53 C 15 45 15.601 -21 16 01.20 L 568
2007-01-24 14:29:43 C 15 45 16.258 -21 16 02.96 L 568
2007-01-24 14:33:05 C 15 45 16.864 -21 16 04.53 L 568
2007-01-24 14:36:28 C 15 45 17.437 -21 16 06.03 L 568
2007-01-24 14:39:51 C 15 45 18.015 -21 16 07.64 L 568
2007-01-24 14:43:15 C 15 45 18.617 -21 16 09.04 L 568
2007-01-24 14:46:38 C 15 45 19.205 -21 16 10.60 L 568
2007-01-24 14:50:00 C 15 45 19.787 -21 16 12.11 L 568
2007-01-24 14:53:33 C 15 45 20.394 -21 16 13.80 L 568
2007-01-24 14:56:56 C 15 45 20.996 -21 16 15.28 L 568
2007-01-24 15:00:31 C 15 45 21.610 -21 16 16.86 L 568
2007-01-24 15:03:54 C 15 45 22.184 -21 16 18.37 L 568
2007-01-24 15:07:16 C 15 45 22.784 -21 16 19.89 L 568
2007-01-24 15:10:50 C 15 45 23.400 -21 16 21.47 L 568
2007-01-24 15:14:13 C 15 45 23.956 -21 16 22.98 L 568
2007-01-24 15:17:36 C 15 45 24.576 -21 16 24.46 L 568
2007-01-24 15:21:08 C 15 45 25.180 -21 16 26.08 L 568
2007-01-24 15:24:33 C 15 45 25.765 -21 16 27.61 L 568
2007-01-24 15:28:07 C 15 45 26.385 -21 16 29.24 L 568
2007-01-24 15:32:23 C 15 45 27.120 -21 16 31.13 L 568
2007-01-24 15:35:46 C 15 45 27.716 -21 16 32.67 L 568
2007-01-24 15:39:09 C 15 45 28.295 -21 16 34.14 L 568
2007-01-24 15:42:31 C 15 45 28.875 -21 16 35.68 L 568
2007-01-24 15:46:04 C 15 45 29.476 -21 16 37.24 L 568
2007-01-24 15:49:26 C 15 45 30.069 -21 16 38.76 L 568
2007-01-24 15:53:05 C 15 45 30.702 -21 16 40.35 L 568
2007-01-24 15:56:28 C 15 45 31.282 -21 16 41.89 L 568
2007-01-24 16:00:06 C 15 45 31.913 -21 16 43.52 L 568
2007-01-24 16:03:35 C 15 45 32.521 -21 16 45.04 L 568
2007-01-25 13:52:35 C 15 49 22.787 -21 26 10.76 L 568
2007-01-25 13:55:59 C 15 49 23.382 -21 26 12.24 L 568
2007-01-25 13:59:21 C 15 49 24.005 -21 26 13.93 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)