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
2013-02-05 20:00:29 C 07 05 21.54 -05 29 47.8 q B17
2013-02-05 20:27:47 C 07 05 18.40 -05 28 57.9 q B17
2013-02-06 05:09:20 C 07 04 25.65 -05 12 54.5 q H45
2013-02-06 05:10:34 C 07 04 25.50 -05 12 52.2 q H45
2013-02-06 05:12:29 C 07 04 25.28 -05 12 48.8 q H45
2013-02-06 05:13:47 C 07 04 25.13 -05 12 46.3 q H45
2013-02-06 05:15:16 C 07 04 24.96 -05 12 43.6 q H45
2013-02-06 05:16:21 C 07 04 24.84 -05 12 41.8 q H45
2013-02-06 05:17:56 C 07 04 24.65 -05 12 38.8 q H45
2013-02-06 05:30:30 C 07 04 23.21 -05 12 15.8 q H45
2013-02-06 14:53:53 C 07 03 29.910 -04 55 03.95 q O44
2013-02-06 14:54:57 C 07 03 29.789 -04 55 02.02 q O44
2013-02-06 14:57:18 C 07 03 29.517 -04 54 57.80 q O44
2013-02-06 14:58:18 C 07 03 29.407 -04 54 55.95 q O44
2013-02-06 15:05:53 C 07 03 28.538 -04 54 42.23 q O44
2013-02-06 15:07:17 C 07 03 28.381 -04 54 39.72 q O44
2013-02-06 15:08:18 C 07 03 28.263 -04 54 37.85 q O44
2013-02-06 15:09:12 C 07 03 28.162 -04 54 36.27 q O44
2013-02-06 15:10:15 C 07 03 28.042 -04 54 34.37 q O44
2013-02-06 15:16:01 C 07 03 27.382 -04 54 23.90 q O44
2013-02-06 15:17:10 C 07 03 27.251 -04 54 21.83 q O44
2013-02-06 15:17:59 C 07 03 27.158 -04 54 20.33 q O44
2013-02-06 15:18:47 C 07 03 27.068 -04 54 18.88 q O44
2013-02-06 15:19:33 C 07 03 26.980 -04 54 17.49 q O44
2013-02-06 15:25:37 C 07 03 26.286 -04 54 06.51 q O44
2013-02-06 15:26:38 C 07 03 26.171 -04 54 04.63 q O44
2013-02-06 15:27:31 C 07 03 26.070 -04 54 03.06 q O44
2013-02-06 15:28:25 C 07 03 25.968 -04 54 01.49 q O44
2013-02-06 15:29:14 C 07 03 25.878 -04 54 00.04 q O44
2013-02-06 15:30:08 C 07 03 25.770 -04 53 58.30 q O44
2013-02-06 15:35:58 C 07 03 25.105 -04 53 47.77 q O44
2013-02-06 15:39:37 C 07 03 24.692 -04 53 41.19 q O44
2013-02-06 15:40:49 C 07 03 24.552 -04 53 38.97 q O44
2013-02-06 15:42:00 C 07 03 24.417 -04 53 36.81 q O44
2013-02-06 15:42:58 C 07 03 24.309 -04 53 35.05 q O44
2013-02-06 15:49:43 C 07 03 23.537 -04 53 22.81 q O44
2013-02-06 15:50:54 C 07 03 23.402 -04 53 20.67 q O44
2013-02-06 15:51:42 C 07 03 23.311 -04 53 19.21 q O44
2013-02-06 15:52:39 C 07 03 23.206 -04 53 17.57 q O44
2013-02-06 15:53:26 C 07 03 23.118 -04 53 16.17 q O44
2013-02-06 15:54:15 C 07 03 23.025 -04 53 14.63 q O44
2013-02-06 15:55:02 C 07 03 22.937 -04 53 13.23 q O44
2013-02-06 15:59:48 C 07 03 22.390 -04 53 04.51 q O44
2013-02-06 16:00:47 C 07 03 22.282 -04 53 02.75 q O44
2013-02-06 16:01:45 C 07 03 22.172 -04 53 01.04 q O44
2013-02-06 16:02:34 C 07 03 22.085 -04 52 59.55 q O44
2013-02-06 16:09:32 C 07 03 21.291 -04 52 46.88 q O44
2013-02-06 16:10:32 C 07 03 21.178 -04 52 45.07 q O44
2013-02-06 16:11:29 C 07 03 21.068 -04 52 43.41 q O44
2013-02-06 16:12:17 C 07 03 20.973 -04 52 41.87 q O44
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)