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
2013-02-05 18:14:49 C 07 05 33.80 -05 33 02.9 q 089
2013-02-05 18:15:04 C 07 05 33.75 -05 33 00.9 q B17
2013-02-05 18:25:05 C 07 05 32.26 -05 32 42.6 u C40
2013-02-05 18:25:08 C 07 05 32.62 -05 32 44.3 q 089
2013-02-05 18:26:37 C 07 05 32.10 -05 32 39.7 u C40
2013-02-05 18:27:12 C 07 05 32.37 -05 32 40.2 q 089
2013-02-05 18:35:46 C 07 05 31.04 -05 32 23.2 u C40
2013-02-05 18:37:16 C 07 05 30.87 -05 32 20.4 u C40
2013-02-05 18:38:48 C 07 05 30.69 -05 32 17.6 u C40
2013-02-05 18:39:08 C 07 05 30.97 -05 32 17.0 q B17
2013-02-05 18:39:36 C 07 05 30.94 -05 32 17.5 q 089
2013-02-05 18:40:20 C 07 05 30.53 -05 32 14.8 u C40
2013-02-05 18:41:41 C 07 05 30.70 -05 32 13.6 q 089
2013-02-05 18:41:51 C 07 05 30.32 -05 32 11.7 u C40
2013-02-05 18:43:23 C 07 05 30.15 -05 32 09.3 u C40
2013-02-05 18:43:44 C 07 05 30.48 -05 32 10.0 q 089
2013-02-05 18:44:54 C 07 05 29.96 -05 32 06.4 u C40
2013-02-05 18:45:49 C 07 05 30.24 -05 32 06.2 q 089
2013-02-05 18:46:25 C 07 05 29.80 -05 32 03.7 u C40
2013-02-05 18:48:27 C 07 05 29.57 -05 31 59.9 u C40
2013-02-05 18:49:58 C 07 05 29.37 -05 31 57.1 u C40
2013-02-05 18:51:30 C 07 05 29.20 -05 31 54.1 u C40
2013-02-05 18:52:00 C 07 05 29.52 -05 31 54.7 q 089
2013-02-05 18:53:02 C 07 05 29.04 -05 31 51.4 u C40
2013-02-05 18:54:05 C 07 05 29.26 -05 31 50.9 q 089
2013-02-05 18:54:33 C 07 05 28.85 -05 31 48.8 u C40
2013-02-05 18:56:05 C 07 05 28.68 -05 31 46.0 u C40
2013-02-05 18:57:36 C 07 05 28.51 -05 31 43.1 u C40
2013-02-05 18:58:13 C 07 05 28.78 -05 31 43.4 q 089
2013-02-05 18:59:07 C 07 05 28.34 -05 31 40.8 u C40
2013-02-05 19:00:16 C 07 05 28.57 -05 31 39.8 q 089
2013-02-05 19:02:10 C 07 05 27.96 -05 31 34.8 u C40
2013-02-05 19:02:21 C 07 05 28.32 -05 31 36.1 q 089
2013-02-05 19:03:42 C 07 05 27.78 -05 31 32.1 u C40
2013-02-05 19:04:24 C 07 05 28.09 -05 31 32.3 q 089
2013-02-05 19:05:13 C 07 05 27.59 -05 31 29.3 u C40
2013-02-05 19:06:29 C 07 05 27.84 -05 31 28.1 q 089
2013-02-05 19:06:44 C 07 05 27.42 -05 31 26.8 u C40
2013-02-05 19:08:16 C 07 05 27.26 -05 31 23.9 u C40
2013-02-05 19:09:47 C 07 05 27.09 -05 31 20.9 u C40
2013-02-05 19:11:19 C 07 05 26.90 -05 31 18.0 u C40
2013-02-05 19:12:50 C 07 05 26.74 -05 31 15.3 u C40
2013-02-05 19:14:21 C 07 05 26.57 -05 31 12.5 u C40
2013-02-05 19:15:53 C 07 05 26.37 -05 31 09.6 u C40
2013-02-05 19:17:24 C 07 05 26.22 -05 31 07.2 u C40
2013-02-05 19:18:21 C 07 05 26.47 -05 31 06.4 q 089
2013-02-05 19:20:24 C 07 05 26.23 -05 31 03.0 q 089
2013-02-05 19:25:08 C 07 05 25.69 -05 30 53.7 q 089
2013-02-05 19:27:13 C 07 05 25.45 -05 30 50.3 q 089
2013-02-05 19:29:16 C 07 05 25.21 -05 30 46.4 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)