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
2021-03-14 18:04:24 C 08 52 13.94 -00 37 14.8 V C40
2021-03-14 18:05:56 C 08 52 13.70 -00 37 11.9 V C40
2021-03-14 18:07:04 C 08 52 12.37 -00 37 19.6 q 168
2021-03-14 18:08:59 C 08 52 13.02 -00 37 04.5 V B18
2021-03-14 18:09:01 C 08 52 13.21 -00 37 05.8 V C40
2021-03-14 18:12:06 C 08 52 12.73 -00 36 59.6 V C40
2021-03-14 18:13:39 C 08 52 12.48 -00 36 56.7 V C40
2021-03-14 18:14:36 C 08 52 12.10 -00 36 53.3 V B18
2021-03-14 18:15:12 C 08 52 12.24 -00 36 53.6 V C40
2021-03-14 18:19:08 C 08 52 11.62 -00 36 45.9 V C40
2021-03-14 18:20:24 C 08 52 11.21 -00 36 41.9 V B18
2021-03-14 18:22:03 C 08 52 10.08 -00 36 50.0 q 168
2021-03-14 18:22:13 C 08 52 11.13 -00 36 39.7 V C40
2021-03-14 18:23:45 C 08 52 10.89 -00 36 36.6 V C40
2021-03-14 18:26:51 C 08 52 10.40 -00 36 30.5 V C40
2021-03-14 18:28:03 C 08 52 09.15 -00 36 38.0 q 168
2021-03-14 18:31:27 C 08 52 09.68 -00 36 21.4 V C40
2021-03-14 18:33:01 C 08 52 09.43 -00 36 18.3 V C40
2021-03-14 18:34:09 C 08 52 09.03 -00 36 14.5 V B18
2021-03-14 18:34:32 C 08 52 09.19 -00 36 15.3 V C40
2021-03-14 18:39:46 C 08 52 08.16 -00 36 03.6 V B18
2021-03-14 18:42:15 C 08 52 07.97 -00 36 00.0 V C40
2021-03-14 18:45:16 C 08 52 07.29 -00 35 52.7 V B18
2021-03-14 18:45:20 C 08 52 07.49 -00 35 53.9 V C40
2021-03-14 18:47:02 C 08 52 08.89 -00 35 49.3 t L89
2021-03-14 18:49:03 C 08 52 05.94 -00 35 56.0 q 168
2021-03-14 18:56:08 C 08 52 06.67 -00 35 31.7 V 073
2021-03-14 18:56:24 C 08 52 07.46 -00 35 30.6 t L89
2021-03-14 18:58:40 C 08 52 05.16 -00 35 26.0 V B18
2021-03-14 19:04:28 C 08 52 04.25 -00 35 14.6 V B18
2021-03-14 19:05:43 C 08 52 06.00 -00 35 12.1 t L89
2021-03-14 19:10:05 C 08 52 03.35 -00 35 03.3 V B18
2021-03-14 19:15:47 C 08 52 02.46 -00 34 52.1 V B18
2021-03-14 19:21:31 C 08 52 01.56 -00 34 41.0 V B18
2021-03-14 19:28:04 C 08 52 00.53 -00 34 27.9 V B18
2021-03-14 19:33:48 C 08 51 59.62 -00 34 16.5 V B18
2021-03-14 19:39:27 C 08 51 58.73 -00 34 05.1 V B18
2021-03-14 19:47:08 C 08 51 58.66 -00 33 51.1 V 073
2021-03-14 19:50:45 C 08 51 56.97 -00 33 42.9 V B18
2021-03-14 20:13:51 C 08 51 53.35 -00 32 57.1 V B18
2021-03-14 20:19:50 C 08 51 52.42 -00 32 45.4 V B18
2021-03-14 20:21:42 C 08 51 54.04 -00 32 42.6 a 233
2021-03-14 20:26:43 C 08 51 51.37 -00 32 31.9 V B18
2021-03-14 20:27:17 C 08 51 53.23 -00 32 32.6 a 233
2021-03-14 20:27:44 C 08 51 55.194 -00 32 13.75 V J04
2021-03-14 20:28:35 C 08 51 55.054 -00 32 12.04 V J04
2021-03-14 20:29:26 C 08 51 54.923 -00 32 10.38 V J04
2021-03-14 20:32:53 C 08 51 52.30 -00 32 20.7 a 233
2021-03-14 20:38:26 C 08 51 51.42 -00 32 09.6 a 233
2021-03-14 20:42:46 C 08 51 49.81 -00 32 01.6 V 073
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)