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
2013-02-12 19:50:29 C 06 52 06.53 -00 41 56.6 q 089
2013-02-12 19:52:33 C 06 52 06.39 -00 41 53.3 q 089
2013-02-12 19:54:38 C 06 52 06.24 -00 41 50.2 q 089
2013-02-12 19:54:47 C 06 52 06.20 -00 41 48.7 q B17
2013-02-12 19:56:41 C 06 52 06.10 -00 41 46.8 q 089
2013-02-12 19:58:46 C 06 52 05.96 -00 41 43.6 q 089
2013-02-12 20:00:49 C 06 52 05.81 -00 41 40.2 q 089
2013-02-12 20:02:54 C 06 52 05.67 -00 41 37.0 q 089
2013-02-12 20:04:57 C 06 52 05.53 -00 41 33.8 q 089
2013-02-12 20:07:02 C 06 52 05.38 -00 41 30.5 q 089
2013-02-12 20:09:05 C 06 52 05.24 -00 41 27.2 q 089
2013-02-12 20:11:10 C 06 52 05.11 -00 41 23.9 q 089
2013-02-12 20:14:45 C 06 52 04.78 -00 41 17.1 q B17
2013-02-12 20:50:38 C 06 52 02.31 -00 40 20.2 q B17
2013-02-12 21:08:29 C 06 52 01.09 -00 39 51.7 q B17
2013-02-12 21:15:08 C 06 52 02.09 -00 39 38.6 w B70
2013-02-12 21:21:22 C 06 52 01.65 -00 39 28.9 w B70
2013-02-12 21:27:38 C 06 52 01.20 -00 39 19.1 w B70
2013-02-12 21:54:29 C 06 51 57.99 -00 38 38.8 q B17
2013-02-12 22:12:38 C 06 51 56.80 -00 38 10.2 q B17
2013-02-12 22:30:25 C 06 51 55.64 -00 37 42.0 q B17
2013-02-12 22:50:38 C 06 51 54.34 -00 37 10.2 q B17
2013-02-13 06:19:46 C 06 51 28.01 -00 24 48.7 o 303
2013-02-13 06:36:39 C 06 51 26.92 -00 24 23.1 o 303
2013-02-13 18:17:28 C 06 50 53.84 -00 06 44.9 q 089
2013-02-13 18:19:33 C 06 50 53.71 -00 06 41.7 q 089
2013-02-13 18:21:36 C 06 50 53.58 -00 06 38.7 q 089
2013-02-13 18:31:57 C 06 50 52.92 -00 06 22.6 q 089
2013-02-13 18:34:00 C 06 50 52.79 -00 06 19.2 q 089
2013-02-13 18:36:05 C 06 50 52.65 -00 06 16.0 q 089
2013-02-13 18:38:08 C 06 50 52.52 -00 06 12.9 q 089
2013-02-13 18:40:13 C 06 50 52.39 -00 06 09.6 q 089
2013-02-13 18:42:16 C 06 50 52.26 -00 06 06.4 q 089
2013-02-13 18:44:21 C 06 50 52.12 -00 06 03.3 q 089
2013-02-13 18:46:24 C 06 50 51.99 -00 05 59.9 q 089
2013-02-13 18:52:37 C 06 50 51.60 -00 05 50.5 q 089
2013-02-13 18:54:40 C 06 50 51.46 -00 05 47.3 q 089
2013-02-13 19:00:52 C 06 50 51.07 -00 05 37.4 q 089
2013-02-13 19:02:56 C 06 50 50.94 -00 05 34.5 q 089
2013-02-13 19:05:00 C 06 50 50.79 -00 05 31.1 q 089
2013-02-13 19:07:04 C 06 50 50.68 -00 05 28.0 q 089
2013-02-13 19:09:08 C 06 50 50.54 -00 05 24.8 q 089
2013-02-13 19:11:23 C 06 50 51.84 -00 05 17.6 w B70
2013-02-13 19:15:21 C 06 50 50.14 -00 05 15.3 q 089
2013-02-13 19:17:24 C 06 50 50.00 -00 05 11.9 q 089
2013-02-13 19:49:04 C 06 50 49.50 -00 04 19.2 w B70
2013-02-13 20:05:39 C 06 50 46.95 -00 03 57.3 q 089
2013-02-13 20:07:42 C 06 50 46.81 -00 03 54.3 q 089
2013-02-13 20:11:50 C 06 50 46.55 -00 03 47.8 q 089
2013-02-13 20:15:58 C 06 50 46.29 -00 03 41.4 q 089
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)