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
2013-01-19 19:59:37 C 08 11 25.32 -18 39 19.3 u D20
2013-01-19 20:00:03 C 08 11 25.22 -18 39 18.4 u D20
2013-01-19 20:00:29 C 08 11 25.11 -18 39 17.5 u D20
2013-01-19 20:00:48 C 08 11 32.11 -18 40 56.3 o 071
2013-01-19 20:01:53 C 08 11 31.83 -18 40 54.2 o 071
2013-01-19 20:03:09 C 08 11 31.53 -18 40 52.1 o 071
2013-01-19 20:04:14 C 08 11 31.30 -18 40 50.6 o 071
2013-01-19 20:05:30 C 08 11 30.99 -18 40 48.0 o 071
2013-01-19 20:06:35 C 08 11 30.72 -18 40 46.1 o 071
2013-01-19 20:07:52 C 08 11 30.43 -18 40 44.0 o 071
2013-01-19 20:08:56 C 08 11 30.17 -18 40 41.8 o 071
2013-01-19 20:10:13 C 08 11 29.87 -18 40 39.9 o 071
2013-01-19 20:11:17 C 08 11 29.62 -18 40 37.4 o 071
2013-01-19 20:12:33 C 08 11 29.32 -18 40 35.7 o 071
2013-01-19 20:13:57 C 08 11 29.00 -18 40 33.5 o 071
2013-01-19 20:15:13 C 08 11 28.72 -18 40 31.2 o 071
2013-01-19 20:16:18 C 08 11 28.43 -18 40 29.5 o 071
2013-01-19 20:17:34 C 08 11 28.12 -18 40 26.8 o 071
2013-01-19 20:18:39 C 08 11 27.87 -18 40 25.0 o 071
2013-01-19 20:19:56 C 08 11 27.57 -18 40 22.6 o 071
2013-01-19 20:21:00 C 08 11 27.28 -18 40 20.6 o 071
2013-01-19 20:22:17 C 08 11 27.02 -18 40 18.5 o 071
2013-01-19 20:23:21 C 08 11 26.76 -18 40 17.1 o 071
2013-01-19 20:24:38 C 08 11 26.47 -18 40 14.6 o 071
2013-01-19 20:25:42 C 08 11 26.19 -18 40 13.0 o 071
2013-01-19 20:26:58 C 08 11 25.90 -18 40 10.3 o 071
2013-01-19 20:28:04 C 08 11 25.66 -18 40 08.5 o 071
2013-01-19 20:29:19 C 08 11 25.36 -18 40 06.2 o 071
2013-01-19 20:30:25 C 08 11 25.04 -18 40 04.9 o 071
2013-01-19 20:31:43 C 08 11 24.77 -18 40 01.9 o 071
2013-01-19 20:32:48 C 08 11 24.53 -18 39 59.9 o 071
2013-01-19 20:37:33 C 08 11 23.38 -18 39 51.7 o 071
2013-01-19 20:38:49 C 08 11 23.10 -18 39 49.3 o 071
2013-01-19 20:39:54 C 08 11 22.85 -18 39 47.6 o 071
2013-01-19 20:41:10 C 08 11 22.53 -18 39 45.4 o 071
2013-01-19 20:42:15 C 08 11 22.27 -18 39 43.2 o 071
2013-01-19 20:43:31 C 08 11 21.98 -18 39 41.2 o 071
2013-01-19 20:44:36 C 08 11 21.76 -18 39 39.6 o 071
2013-01-19 20:45:53 C 08 11 21.41 -18 39 37.0 o 071
2013-01-19 20:46:57 C 08 11 21.17 -18 39 35.1 o 071
2013-01-19 20:51:39 C 08 11 20.05 -18 39 27.0 o 071
2013-01-19 20:52:55 C 08 11 19.76 -18 39 24.6 o 071
2013-01-19 20:54:00 C 08 11 19.48 -18 39 23.1 o 071
2013-01-19 20:55:16 C 08 11 19.20 -18 39 20.5 o 071
2013-01-19 20:56:22 C 08 11 18.92 -18 39 18.5 o 071
2013-01-19 20:57:39 C 08 11 18.65 -18 39 16.4 o 071
2013-01-19 20:58:43 C 08 11 18.37 -18 39 14.3 o 071
2013-01-19 21:00:00 C 08 11 18.07 -18 39 12.0 o 071
2013-01-19 21:01:06 C 08 11 17.81 -18 39 10.0 o 071
2013-01-19 21:02:23 C 08 11 17.51 -18 39 08.0 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)