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
2005-01-15 18:47:17 C 03 14 25.75 -07 06 09.7 c A62
2005-01-15 18:51:46 C 03 14 26.56 -07 06 00.7 o 198
2005-01-15 18:56:59 C 03 14 27.46 -07 05 49.9 o 198
2005-01-15 19:02:13 C 03 14 28.34 -07 05 39.1 o 198
2005-01-15 19:47:49 C 03 14 36.20 -07 04 04.3 r 201
2005-01-15 19:54:45 C 03 14 37.39 -07 03 50.4 r 201
2005-01-15 20:01:31 C 03 14 38.54 -07 03 36.4 r 201
2005-01-15 21:08:02 C 03 14 49.89 -07 01 19.9 r 204
2005-01-15 21:11:26 C 03 14 50.50 -07 01 12.7 o 204
2005-01-15 21:15:10 C 03 14 51.13 -07 01 05.1 o 204
2005-01-15 21:18:24 C 03 14 51.69 -07 00 58.5 r 204
2005-01-16 03:58:46 C 03 16 02.94 -06 46 07.4 c 844
2005-01-16 04:02:28 C 03 16 03.58 -06 46 00.1 c 844
2005-01-16 04:04:26 C 03 16 03.88 -06 45 56.4 c 844
2005-01-16 04:06:46 C 03 16 04.35 -06 45 51.7 c 844
2005-01-16 05:52:17 C 03 16 24.08 -06 43 26.4 r G95
2005-01-18 02:31:19 C 03 24 14.90 -05 16 17.1 r H36
2005-01-18 02:34:02 C 03 24 15.37 -05 16 10.9 r H36
2005-01-18 02:36:08 C 03 24 16.49 -05 16 02.2 o 696
2005-01-18 02:46:41 C 03 24 18.16 -05 15 42.0 o 696
2005-01-19 20:50:19 C 03 31 14.65 -03 58 23.6 c A53
2005-01-19 20:56:40 C 03 31 15.41 -03 58 09.5 c A53
2005-01-20 00:32:15 C 03 31 52.59 -03 51 41.9 r H36
2005-01-20 00:36:45 C 03 31 53.22 -03 51 34.7 r H36
2005-01-21 02:25:20 C 03 35 55.33 -03 05 17.6 c 844
2005-01-21 02:27:47 C 03 35 55.61 -03 05 14.4 c 844
2005-01-21 02:39:38 C 03 35 57.46 -03 04 54.7 c 844
2005-01-21 02:47:36 C 03 35 58.65 -03 04 41.3 c 844
2005-01-21 21:05:43 C 03 38 49.00 -02 34 42.7 c A48
2005-01-21 21:11:01 C 03 38 49.82 -02 34 34.1 c A48
2005-01-21 21:16:20 C 03 38 50.76 -02 34 27.0 c A48
2005-01-22 19:20:55 C 03 42 11.78 -01 57 56.4 c A30
2005-01-22 19:21:49 C 03 42 11.90 -01 57 55.1 c A30
2005-01-22 19:23:09 C 03 42 12.07 -01 57 52.9 c A30
2005-01-22 19:25:09 C 03 42 12.36 -01 57 49.8 c A30
2005-01-22 20:21:21 C 03 42 20.61 -01 56 14.3 r 941
2005-01-22 20:22:41 C 03 42 20.79 -01 56 12.0 r 941
2005-01-22 20:24:39 C 03 42 21.06 -01 56 08.8 r 941
2005-01-22 20:27:17 C 03 42 21.42 -01 56 04.4 r 941
2005-01-22 21:04:41 C 03 42 26.25 -01 55 07.5 c A53
2005-01-22 21:14:43 C 03 42 27.57 -01 54 49.1 c A53
2005-01-22 21:30:29 C 03 42 29.92 -01 54 26.0 c A53
2005-01-23 17:53:46 C 03 45 32.44 -01 21 45.5 o 198
2005-01-23 17:58:02 C 03 45 33.02 -01 21 38.9 o 198
2005-01-23 18:02:46 C 03 45 33.66 -01 21 31.4 o 198
2005-01-23 18:13:46 C 03 45 35.15 -01 21 14.2 o 198
2005-01-23 18:17:27 C 03 45 35.65 -01 21 08.6 o 198
2005-01-24 01:04:11 C 03 46 33.24 -01 09 20.8 c 844
2005-01-24 01:14:55 C 03 46 34.68 -01 09 04.0 c 844
2005-01-24 01:26:44 C 03 46 36.29 -01 08 44.7 c 844
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)