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 14:41:21 C 08 52 40.31 -00 43 47.0 t P66
2021-03-14 15:09:56 C 08 52 35.70 -00 42 49.2 t P66
2021-03-14 15:10:26 C 08 52 35.70 -00 42 49.2 t P66
2021-03-14 16:14:45 C 08 52 31.06 -00 40 51.9 V C40
2021-03-14 16:25:33 C 08 52 29.40 -00 40 30.7 V C40
2021-03-14 16:28:37 C 08 52 28.92 -00 40 24.6 V C40
2021-03-14 16:33:15 C 08 52 28.21 -00 40 15.5 V C40
2021-03-14 16:34:47 C 08 52 27.97 -00 40 12.3 V C40
2021-03-14 16:39:31 C 08 52 27.23 -00 40 02.9 V C40
2021-03-14 16:42:36 C 08 52 26.76 -00 39 56.8 V C40
2021-03-14 16:44:09 C 08 52 26.51 -00 39 53.8 V C40
2021-03-14 16:45:41 C 08 52 26.28 -00 39 50.8 V C40
2021-03-14 16:50:19 C 08 52 25.56 -00 39 41.5 V C40
2021-03-14 16:51:52 C 08 52 25.31 -00 39 38.6 V C40
2021-03-14 16:53:23 C 08 52 25.08 -00 39 35.4 V C40
2021-03-14 16:56:28 C 08 52 24.60 -00 39 29.4 V C40
2021-03-14 16:59:33 C 08 52 24.11 -00 39 23.3 V C40
2021-03-14 17:01:07 C 08 52 23.88 -00 39 20.1 V C40
2021-03-14 17:05:19 C 08 52 23.22 -00 39 11.9 V C40
2021-03-14 17:06:51 C 08 52 22.98 -00 39 08.9 V C40
2021-03-14 17:07:20 C 08 52 22.73 -00 39 06.4 V B18
2021-03-14 17:11:29 C 08 52 22.25 -00 38 59.7 V C40
2021-03-14 17:12:53 C 08 52 21.86 -00 38 55.4 V B18
2021-03-14 17:13:01 C 08 52 22.01 -00 38 56.7 V C40
2021-03-14 17:14:34 C 08 52 21.77 -00 38 53.6 V C40
2021-03-14 17:17:38 C 08 52 21.29 -00 38 47.5 V C40
2021-03-14 17:18:42 C 08 52 20.95 -00 38 44.0 V B18
2021-03-14 17:20:43 C 08 52 20.81 -00 38 41.4 V C40
2021-03-14 17:23:48 C 08 52 20.32 -00 38 35.3 V C40
2021-03-14 17:28:26 C 08 52 19.59 -00 38 26.1 V C40
2021-03-14 17:31:31 C 08 52 19.11 -00 38 20.0 V C40
2021-03-14 17:33:10 C 08 52 18.68 -00 38 15.2 V B18
2021-03-14 17:38:19 C 08 52 18.04 -00 38 06.5 V C40
2021-03-14 17:39:08 C 08 52 17.73 -00 38 03.7 V B18
2021-03-14 17:39:52 C 08 52 17.80 -00 38 03.5 V C40
2021-03-14 17:42:57 C 08 52 17.31 -00 37 57.4 V C40
2021-03-14 17:44:30 C 08 52 17.07 -00 37 54.4 V C40
2021-03-14 17:45:43 C 08 52 16.68 -00 37 50.6 V B18
2021-03-14 17:46:02 C 08 52 16.83 -00 37 51.2 V C40
2021-03-14 17:47:35 C 08 52 16.59 -00 37 48.3 V C40
2021-03-14 17:49:07 C 08 52 16.34 -00 37 45.1 V C40
2021-03-14 17:50:40 C 08 52 16.10 -00 37 42.1 V C40
2021-03-14 17:51:46 C 08 52 15.74 -00 37 38.5 V B18
2021-03-14 17:52:12 C 08 52 15.86 -00 37 39.1 V C40
2021-03-14 17:55:18 C 08 52 15.37 -00 37 33.0 V C40
2021-03-14 17:57:56 C 08 52 15.80 -00 37 27.0 V 073
2021-03-14 17:59:55 C 08 52 14.65 -00 37 23.9 V C40
2021-03-14 18:01:28 C 08 52 14.40 -00 37 20.8 V C40
2021-03-14 18:03:00 C 08 52 14.16 -00 37 17.6 V C40
2021-03-14 18:03:21 C 08 52 13.88 -00 37 15.5 V B18
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)