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
2013-01-09 00:13:18 C 09 13 26.45 -24 52 25.0 o 071
2013-01-09 00:14:13 C 09 13 26.25 -24 52 24.1 o 071
2013-01-09 00:15:55 C 09 13 25.74 -24 52 22.2 o 071
2013-01-09 00:17:36 C 09 13 25.30 -24 52 20.7 o 071
2013-01-09 00:19:00 C 09 13 24.91 -24 52 19.2 o 071
2013-01-09 00:20:17 C 09 13 24.55 -24 52 18.1 o 071
2013-01-09 00:21:34 C 09 13 24.22 -24 52 16.7 o 071
2013-01-09 00:22:52 C 09 13 23.88 -24 52 15.3 o 071
2013-01-09 00:24:09 C 09 13 23.52 -24 52 14.2 o 071
2013-01-09 00:25:26 C 09 13 23.19 -24 52 12.8 o 071
2013-01-09 00:26:43 C 09 13 22.85 -24 52 11.6 o 071
2013-01-09 00:28:00 C 09 13 22.51 -24 52 10.4 o 071
2013-01-09 00:34:26 C 09 13 20.78 -24 52 03.8 o 071
2013-01-09 00:36:58 C 09 13 20.11 -24 52 01.6 o 071
2013-01-09 00:39:16 C 09 13 19.52 -24 51 59.3 o 071
2013-01-09 00:41:34 C 09 13 18.88 -24 51 56.9 o 071
2013-01-09 00:43:53 C 09 13 18.28 -24 51 54.8 o 071
2013-01-09 00:46:11 C 09 13 17.65 -24 51 52.2 o 071
2013-01-09 00:48:30 C 09 13 17.04 -24 51 49.4 o 071
2013-01-09 00:50:48 C 09 13 16.42 -24 51 48.0 o 071
2013-01-09 00:53:06 C 09 13 15.79 -24 51 45.4 o 071
2013-01-09 00:55:25 C 09 13 15.18 -24 51 42.9 o 071
2013-01-09 00:58:28 C 09 13 14.38 -24 51 40.0 o 071
2013-01-09 00:59:24 C 09 13 14.13 -24 51 39.0 o 071
2013-01-09 01:00:20 C 09 13 13.88 -24 51 38.1 o 071
2013-01-09 01:01:16 C 09 13 13.67 -24 51 37.0 o 071
2013-01-09 01:02:10 C 09 13 13.38 -24 51 36.2 o 071
2013-01-09 01:03:06 C 09 13 13.16 -24 51 35.6 o 071
2013-01-09 01:04:01 C 09 13 12.90 -24 51 34.6 o 071
2013-01-09 01:04:56 C 09 13 12.66 -24 51 33.6 o 071
2013-01-09 01:05:51 C 09 13 12.42 -24 51 32.6 o 071
2013-01-09 01:06:47 C 09 13 12.17 -24 51 31.6 o 071
2013-01-09 01:08:37 C 09 13 11.68 -24 51 29.8 o 071
2013-01-09 01:09:54 C 09 13 11.34 -24 51 28.5 o 071
2013-01-09 01:11:12 C 09 13 10.98 -24 51 27.1 o 071
2013-01-09 01:12:29 C 09 13 10.64 -24 51 25.9 o 071
2013-01-09 01:13:46 C 09 13 10.30 -24 51 24.6 o 071
2013-01-09 01:15:03 C 09 13 09.96 -24 51 23.3 o 071
2013-01-09 01:16:20 C 09 13 09.63 -24 51 22.0 o 071
2013-01-09 01:17:37 C 09 13 09.28 -24 51 20.6 o 071
2013-01-09 01:18:55 C 09 13 08.94 -24 51 19.4 o 071
2013-01-09 01:20:12 C 09 13 08.59 -24 51 18.1 o 071
2013-01-09 01:22:30 C 09 13 07.98 -24 51 15.3 o 071
2013-01-09 01:24:49 C 09 13 07.39 -24 51 13.7 o 071
2013-01-09 01:26:22 C 09 13 08.48 -24 51 14.4 u B04
2013-01-09 01:27:07 C 09 13 06.76 -24 51 10.9 o 071
2013-01-09 01:29:25 C 09 13 06.08 -24 51 08.2 o 071
2013-01-09 01:31:44 C 09 13 05.52 -24 51 06.1 o 071
2013-01-09 01:34:02 C 09 13 04.93 -24 51 04.5 o 071
2013-01-09 01:35:42 C 09 13 05.93 -24 51 05.4 u B04
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)