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
2013-01-21 21:13:22 C 08 01 00.99 -17 09 45.0 q C27
2013-01-21 21:57:03 C 08 00 51.22 -17 08 24.0 q C27
2013-01-21 22:13:37 C 08 00 47.49 -17 07 53.0 q C27
2013-01-22 05:50:16 C 07 59 09.60 -16 52 48.8 o 303
2013-01-22 06:54:13 C 07 58 54.95 -16 50 43.8 o 303
2013-01-22 12:58:16 C 07 57 47.73 -16 38 06.9 u D20
2013-01-22 12:58:44 C 07 57 47.62 -16 38 05.9 u D20
2013-01-22 12:59:07 C 07 57 47.53 -16 38 05.3 u D20
2013-01-22 13:58:34 C 07 57 34.45 -16 36 14.7 u D20
2013-01-22 13:59:00 C 07 57 34.35 -16 36 13.9 u D20
2013-01-22 13:59:26 C 07 57 34.24 -16 36 13.1 u D20
2013-01-22 14:59:40 C 07 57 20.81 -16 34 19.8 u D20
2013-01-22 15:00:06 C 07 57 20.71 -16 34 18.9 u D20
2013-01-22 15:00:31 C 07 57 20.62 -16 34 18.3 u D20
2013-01-22 15:59:36 C 07 57 07.35 -16 32 25.6 u D20
2013-01-22 16:00:02 C 07 57 07.25 -16 32 24.7 u D20
2013-01-22 16:00:28 C 07 57 07.14 -16 32 23.9 u D20
2013-01-22 16:59:21 C 07 56 53.93 -16 30 30.1 u D20
2013-01-22 16:59:49 C 07 56 53.84 -16 30 29.3 u D20
2013-01-22 17:00:16 C 07 56 53.74 -16 30 28.4 u D20
2013-01-22 17:59:40 C 07 56 40.49 -16 28 32.1 u D20
2013-01-22 18:00:06 C 07 56 40.40 -16 28 31.3 u D20
2013-01-22 18:00:31 C 07 56 40.30 -16 28 30.5 u D20
2013-01-22 18:55:18 C 07 56 34.35 -16 28 19.5 u B17
2013-01-22 18:59:38 C 07 56 27.32 -16 26 33.5 u D20
2013-01-22 19:00:06 C 07 56 27.22 -16 26 32.6 u D20
2013-01-22 19:00:32 C 07 56 27.11 -16 26 31.1 u D20
2013-01-22 19:27:09 C 07 56 27.48 -16 27 19.6 u B17
2013-01-22 19:30:10 C 07 56 26.82 -16 27 13.9 u B17
2013-01-22 19:33:10 C 07 56 26.17 -16 27 08.3 u B17
2013-01-22 19:36:09 C 07 56 25.53 -16 27 02.7 u B17
2013-01-22 19:39:10 C 07 56 24.87 -16 26 57.0 u B17
2013-01-22 19:58:29 C 07 56 14.64 -16 24 36.0 u D20
2013-01-22 19:58:55 C 07 56 14.55 -16 24 35.2 u D20
2013-01-22 19:59:17 C 07 56 14.48 -16 24 34.5 u D20
2013-01-22 20:00:02 C 07 56 20.33 -16 26 17.6 u B17
2013-01-22 20:03:02 C 07 56 19.67 -16 26 11.8 u B17
2013-01-22 20:06:01 C 07 56 19.02 -16 26 06.2 u B17
2013-01-22 20:09:02 C 07 56 18.36 -16 26 00.3 u B17
2013-01-22 20:33:11 C 07 56 13.08 -16 25 14.4 u B17
2013-01-22 20:36:10 C 07 56 12.43 -16 25 08.7 u B17
2013-01-22 20:39:10 C 07 56 11.76 -16 25 03.0 u B17
2013-01-22 20:42:11 C 07 56 11.10 -16 24 57.3 u B17
2013-01-22 20:45:10 C 07 56 10.44 -16 24 51.4 u B17
2013-01-22 20:46:05 C 07 56 11.76 -16 24 46.3 u 104
2013-01-22 20:48:44 C 07 56 11.19 -16 24 41.2 u 104
2013-01-22 20:54:03 C 07 56 10.04 -16 24 31.3 u 104
2013-01-22 21:00:13 C 07 56 07.15 -16 24 22.7 u B17
2013-01-22 21:03:14 C 07 56 06.49 -16 24 16.9 u B17
2013-01-22 21:09:13 C 07 56 05.17 -16 24 05.4 u B17
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)