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
2012-12-29 01:50:17 C 10 14 01.35 -27 16 32.3 v 470
2012-12-29 13:37:58 C 10 11 30.158 -27 13 58.32 L F51
2012-12-29 13:39:43 C 10 11 29.742 -27 13 58.00 L F51
2012-12-29 13:53:57 C 10 11 26.311 -27 13 55.18 L F51
2012-12-29 13:55:41 C 10 11 25.896 -27 13 54.83 L F51
2012-12-29 18:52:48 C 10 10 23.53 -27 11 37.7 t D20
2012-12-29 18:53:29 C 10 10 23.36 -27 11 37.6 t D20
2012-12-29 18:54:12 C 10 10 23.19 -27 11 37.5 t D20
2012-12-29 18:56:08 C 10 10 22.73 -27 11 37.1 t D20
2012-12-29 18:56:51 C 10 10 22.56 -27 11 37.0 t D20
2012-12-29 18:57:33 C 10 10 22.39 -27 11 36.8 t D20
2012-12-29 18:59:24 C 10 10 21.95 -27 11 36.5 t D20
2012-12-29 19:00:06 C 10 10 21.78 -27 11 36.4 t D20
2012-12-29 19:00:47 C 10 10 21.62 -27 11 36.2 t D20
2012-12-29 19:25:58 C 10 10 15.60 -27 11 31.3 t D20
2012-12-29 19:26:40 C 10 10 15.43 -27 11 31.2 t D20
2012-12-29 19:27:21 C 10 10 15.26 -27 11 31.1 t D20
2012-12-30 20:07:21 C 10 04 51.81 -27 06 38.7 o 300
2012-12-30 20:08:09 C 10 04 51.62 -27 06 38.4 o 300
2012-12-30 20:08:57 C 10 04 51.49 -27 06 37.8 o 300
2012-12-30 20:09:46 C 10 04 51.24 -27 06 37.5 o 300
2012-12-31 00:31:01 C 10 03 57.80 -27 05 28.1 o 071
2012-12-31 00:34:58 C 10 03 57.13 -27 05 27.3 o 071
2012-12-31 00:40:12 C 10 03 55.83 -27 05 25.9 o 071
2012-12-31 00:44:33 C 10 03 54.54 -27 05 24.4 o 071
2012-12-31 00:52:33 C 10 03 52.58 -27 05 22.5 o 071
2012-12-31 00:56:15 C 10 03 51.71 -27 05 21.5 o 071
2012-12-31 01:00:09 C 10 03 50.90 -27 05 20.5 o 071
2012-12-31 01:07:14 C 10 03 49.20 -27 05 18.7 o 071
2012-12-31 01:09:34 C 10 03 48.61 -27 05 17.9 o 071
2012-12-31 01:12:43 C 10 03 47.82 -27 05 17.1 o 071
2012-12-31 01:15:04 C 10 03 47.32 -27 05 16.4 o 071
2012-12-31 01:17:24 C 10 03 46.67 -27 05 15.8 o 071
2012-12-31 01:19:47 C 10 03 46.16 -27 05 15.1 o 071
2012-12-31 01:22:09 C 10 03 45.52 -27 05 14.5 o 071
2012-12-31 01:29:54 C 10 03 43.71 -27 05 12.2 o 071
2012-12-31 01:32:17 C 10 03 43.13 -27 05 11.5 o 071
2012-12-31 01:34:38 C 10 03 42.57 -27 05 10.9 o 071
2012-12-31 01:36:59 C 10 03 41.99 -27 05 10.2 o 071
2012-12-31 01:39:21 C 10 03 41.44 -27 05 09.6 o 071
2012-12-31 01:42:04 C 10 03 40.78 -27 05 08.7 o 071
2012-12-31 01:47:17 C 10 03 39.57 -27 05 07.1 o 071
2012-12-31 01:50:38 C 10 03 38.68 -27 05 06.5 o 071
2012-12-31 01:54:00 C 10 03 37.85 -27 05 05.2 o 071
2012-12-31 01:57:21 C 10 03 37.12 -27 05 04.2 o 071
2012-12-31 02:00:48 C 10 03 36.26 -27 05 03.1 o 071
2012-12-31 02:03:09 C 10 03 35.67 -27 05 02.4 o 071
2012-12-31 02:05:30 C 10 03 35.11 -27 05 01.7 o 071
2012-12-31 02:07:52 C 10 03 34.53 -27 05 00.9 o 071
2012-12-31 02:10:14 C 10 03 33.97 -27 05 00.2 o 071
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)