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
2013-01-10 01:03:34 C 09 07 18.042 -24 26 50.37 15.71 q C20
2013-01-10 01:05:39 C 09 07 17.503 -24 26 48.33 15.8 q C20
2013-01-10 01:10:48 C 09 07 16.136 -24 26 42.54 15.71 q C20
2013-01-10 01:23:38 C 09 07 12.757 -24 26 27.64 15.66 q C20
2013-01-10 01:50:14 C 09 07 13.56 -24 24 10.5 u 844
2013-01-10 01:52:54 C 09 07 12.87 -24 24 07.8 u 844
2013-01-10 01:55:36 C 09 07 12.17 -24 24 05.3 u 844
2013-01-10 01:58:16 C 09 07 11.47 -24 24 02.6 u 844
2013-01-10 02:00:56 C 09 07 10.80 -24 24 00.1 u 844
2013-01-10 02:03:36 C 09 07 10.10 -24 23 57.5 u 844
2013-01-10 02:06:18 C 09 07 09.40 -24 23 54.9 u 844
2013-01-10 02:08:57 C 09 07 08.70 -24 23 52.4 u 844
2013-01-10 02:11:38 C 09 07 07.99 -24 23 49.7 u 844
2013-01-10 02:14:19 C 09 07 07.28 -24 23 47.1 u 844
2013-01-10 04:35:55 C 09 06 30.84 -24 21 20.4 u I47
2013-01-10 04:36:27 C 09 06 30.69 -24 21 19.7 u I47
2013-01-10 04:37:01 C 09 06 30.54 -24 21 19.2 u I47
2013-01-10 04:38:08 C 09 06 30.24 -24 21 18.0 u I47
2013-01-10 04:38:41 C 09 06 30.09 -24 21 17.5 u I47
2013-01-10 04:40:22 C 09 06 29.66 -24 21 15.8 u I47
2013-01-10 04:40:29 C 09 06 29.62 -24 21 15.5 u I47
2013-01-10 04:44:14 C 09 06 28.62 -24 21 11.8 u I47
2013-01-10 04:44:48 C 09 06 28.47 -24 21 11.2 u I47
2013-01-10 21:45:54 C 09 02 16.345 -24 03 52.57 15.85 q C20
2013-01-10 21:51:13 C 09 02 14.938 -24 03 46.66 16.03 q C20
2013-01-10 21:55:00 C 09 02 13.924 -24 03 42.29 15.83 q C20
2013-01-10 22:12:12 C 09 02 09.350 -24 03 23.15 15.79 q C20
2013-01-10 22:15:53 C 09 02 08.361 -24 03 18.89 16.03 q C20
2013-01-10 22:17:03 C 09 02 08.043 -24 03 17.46 15.84 q C20
2013-01-10 22:18:19 C 09 02 07.706 -24 03 16.05 15.9 q C20
2013-01-10 22:20:58 C 09 02 07.010 -24 03 13.17 15.91 q C20
2013-01-10 22:22:06 C 09 02 06.692 -24 03 11.76 15.86 q C20
2013-01-10 22:23:14 C 09 02 06.398 -24 03 10.50 15.84 q C20
2013-01-10 22:24:45 C 09 02 05.986 -24 03 08.80 15.84 q C20
2013-01-10 22:25:53 C 09 02 05.693 -24 03 07.52 15.9 q C20
2013-01-10 22:32:51 C 09 02 03.806 -24 02 59.61 15.82 q C20
2013-01-10 22:35:19 C 09 02 03.166 -24 02 56.78 15.91 q C20
2013-01-10 22:36:27 C 09 02 02.856 -24 02 55.27 15.99 q C20
2013-01-10 22:43:58 C 09 02 00.875 -24 02 46.60 16.16 q C20
2013-01-10 22:45:06 C 09 02 00.550 -24 02 45.44 15.8 q C20
2013-01-10 22:47:28 C 09 01 59.912 -24 02 42.47 15.86 q C20
2013-01-10 22:48:36 C 09 01 59.644 -24 02 41.61 15.8 q C20
2013-01-10 22:49:44 C 09 01 59.309 -24 02 40.10 15.86 q C20
2013-01-10 22:49:47 C 09 02 00.43 -24 02 34.9 r A84
2013-01-10 22:51:07 C 09 01 58.968 -24 02 38.70 15.92 q C20
2013-01-10 22:52:16 C 09 01 58.645 -24 02 37.37 15.97 q C20
2013-01-10 22:52:28 C 09 01 59.72 -24 02 31.8 r A84
2013-01-10 22:53:28 C 09 01 58.304 -24 02 35.84 16.02 q C20
2013-01-10 22:53:48 C 09 01 59.32 -24 02 30.1 r A84
2013-01-10 22:54:36 C 09 01 58.024 -24 02 34.44 15.82 q C20
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)