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
2013-01-16 01:32:27 C 08 32 15.88 -21 12 37.5 u I47
2013-01-16 01:33:00 C 08 32 15.75 -21 12 36.8 u I47
2013-01-16 01:33:34 C 08 32 15.61 -21 12 35.9 u I47
2013-01-16 01:34:07 C 08 32 15.47 -21 12 35.1 u I47
2013-01-16 01:34:40 C 08 32 15.33 -21 12 34.3 u I47
2013-01-16 01:35:14 C 08 32 15.20 -21 12 33.4 u I47
2013-01-16 01:35:47 C 08 32 15.05 -21 12 32.7 u I47
2013-01-16 01:36:21 C 08 32 14.91 -21 12 31.8 u I47
2013-01-16 17:46:16 C 08 28 20.96 -20 47 00.6 u D20
2013-01-16 17:46:43 C 08 28 20.85 -20 46 59.9 u D20
2013-01-16 17:47:09 C 08 28 20.74 -20 46 59.1 u D20
2013-01-16 20:38:01 C 08 27 43.56 -20 43 57.6 u C40
2013-01-16 20:39:25 C 08 27 43.22 -20 43 54.3 u C40
2013-01-16 20:40:56 C 08 27 42.86 -20 43 52.4 u C40
2013-01-17 16:06:41 C 08 23 11.61 -20 10 05.8 u D20
2013-01-17 16:07:07 C 08 23 11.50 -20 10 05.1 u D20
2013-01-17 16:07:33 C 08 23 11.39 -20 10 04.4 u D20
2013-01-17 16:10:39 C 08 23 10.61 -20 09 59.2 u D20
2013-01-17 16:11:07 C 08 23 10.49 -20 09 58.5 u D20
2013-01-17 16:11:33 C 08 23 10.38 -20 09 57.8 u D20
2013-01-17 16:42:14 C 08 23 02.59 -20 09 06.5 u D20
2013-01-17 16:42:40 C 08 23 02.48 -20 09 05.8 u D20
2013-01-17 16:43:07 C 08 23 02.37 -20 09 05.0 u D20
2013-01-17 16:59:33 C 08 22 58.19 -20 08 37.4 u D20
2013-01-17 16:59:59 C 08 22 58.07 -20 08 36.6 u D20
2013-01-17 17:06:07 C 08 22 56.52 -20 08 26.2 u D20
2013-01-17 17:06:35 C 08 22 56.41 -20 08 25.4 u D20
2013-01-17 17:07:01 C 08 22 56.30 -20 08 24.7 u D20
2013-01-17 17:27:14 C 08 22 51.17 -20 07 50.4 u D20
2013-01-17 17:27:40 C 08 22 51.06 -20 07 49.7 u D20
2013-01-17 17:28:07 C 08 22 50.94 -20 07 48.9 u D20
2013-01-17 17:34:48 C 08 22 49.25 -20 07 37.4 u D20
2013-01-17 17:35:14 C 08 22 49.14 -20 07 36.7 u D20
2013-01-17 17:35:40 C 08 22 49.01 -20 07 35.9 u D20
2013-01-18 16:01:31 C 08 17 44.19 -19 29 07.3 u D20
2013-01-18 16:01:56 C 08 17 44.09 -19 29 06.5 u D20
2013-01-18 16:02:23 C 08 17 43.98 -19 29 05.7 u D20
2013-01-18 16:03:58 C 08 17 43.59 -19 29 03.2 u D20
2013-01-18 16:04:26 C 08 17 43.48 -19 29 02.3 u D20
2013-01-18 16:04:52 C 08 17 43.37 -19 29 01.5 u D20
2013-01-18 16:06:48 C 08 17 42.89 -19 28 58.2 u D20
2013-01-18 16:07:15 C 08 17 42.78 -19 28 57.4 u D20
2013-01-18 16:07:41 C 08 17 42.67 -19 28 56.6 u D20
2013-01-18 16:39:05 C 08 17 34.85 -19 28 02.3 u D20
2013-01-18 16:39:31 C 08 17 34.74 -19 28 01.5 u D20
2013-01-18 16:39:58 C 08 17 34.67 -19 28 00.5 u D20
2013-01-18 16:50:26 C 08 17 32.03 -19 27 42.4 u D20
2013-01-18 16:50:51 C 08 17 31.92 -19 27 41.6 u D20
2013-01-18 16:51:18 C 08 17 31.81 -19 27 40.9 u D20
2013-01-18 16:57:19 C 08 17 30.31 -19 27 30.4 u D20
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)