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
2013-02-04 16:59:33 C 07 08 10.20 -06 18 26.2 u D20
2013-02-04 17:00:00 C 07 08 10.15 -06 18 25.5 u D20
2013-02-04 17:00:27 C 07 08 10.10 -06 18 24.6 u D20
2013-02-04 17:59:20 C 07 08 02.95 -06 16 33.2 u D20
2013-02-04 17:59:47 C 07 08 02.89 -06 16 32.5 u D20
2013-02-04 18:00:12 C 07 08 02.84 -06 16 31.7 u D20
2013-02-05 12:58:33 C 07 06 06.41 -05 41 20.4 u D20
2013-02-05 12:59:02 C 07 06 06.35 -05 41 19.6 u D20
2013-02-05 12:59:28 C 07 06 06.30 -05 41 18.8 u D20
2013-02-05 13:59:36 C 07 05 59.06 -05 39 28.3 u D20
2013-02-05 14:00:03 C 07 05 59.00 -05 39 27.5 u D20
2013-02-05 14:00:29 C 07 05 58.95 -05 39 26.6 u D20
2013-02-05 14:28:59 C 07 05 56.627 -05 39 41.01 q O44
2013-02-05 14:34:06 C 07 05 56.011 -05 39 31.65 q O44
2013-02-05 14:34:54 C 07 05 55.912 -05 39 30.13 q O44
2013-02-05 14:35:40 C 07 05 55.820 -05 39 28.70 q O44
2013-02-05 14:42:04 C 07 05 55.045 -05 39 16.93 q O44
2013-02-05 14:43:49 C 07 05 54.834 -05 39 13.77 q O44
2013-02-05 14:44:35 C 07 05 54.738 -05 39 12.32 q O44
2013-02-05 14:45:20 C 07 05 54.649 -05 39 11.00 q O44
2013-02-05 14:46:09 C 07 05 54.550 -05 39 09.42 q O44
2013-02-05 14:46:55 C 07 05 54.455 -05 39 08.02 q O44
2013-02-05 14:51:39 C 07 05 53.888 -05 38 59.42 q O44
2013-02-05 14:53:34 C 07 05 53.649 -05 38 55.78 q O44
2013-02-05 14:54:21 C 07 05 53.552 -05 38 54.35 q O44
2013-02-05 14:55:08 C 07 05 53.463 -05 38 52.96 q O44
2013-02-05 15:04:02 C 07 05 52.380 -05 38 36.57 q O44
2013-02-05 15:04:48 C 07 05 52.288 -05 38 35.15 q O44
2013-02-05 15:05:37 C 07 05 52.187 -05 38 33.64 q O44
2013-02-05 15:06:24 C 07 05 52.092 -05 38 32.17 q O44
2013-02-05 15:07:10 C 07 05 52.005 -05 38 30.83 q O44
2013-02-05 15:12:04 C 07 05 51.408 -05 38 21.76 q O44
2013-02-05 15:17:55 C 07 05 50.696 -05 38 11.02 q O44
2013-02-05 15:19:41 C 07 05 50.483 -05 38 07.71 q O44
2013-02-05 15:21:25 C 07 05 50.273 -05 38 04.57 q O44
2013-02-05 15:23:09 C 07 05 50.062 -05 38 01.37 q O44
2013-02-05 15:32:27 C 07 05 48.933 -05 37 44.19 q O44
2013-02-05 15:33:55 C 07 05 48.759 -05 37 41.51 q O44
2013-02-05 15:34:47 C 07 05 48.653 -05 37 39.92 q O44
2013-02-05 15:35:39 C 07 05 48.548 -05 37 38.29 q O44
2013-02-05 15:36:39 C 07 05 48.427 -05 37 36.46 q O44
2013-02-05 15:37:27 C 07 05 48.333 -05 37 35.06 q O44
2013-02-05 15:43:02 C 07 05 47.655 -05 37 24.72 q O44
2013-02-05 15:44:32 C 07 05 47.473 -05 37 21.94 q O44
2013-02-05 15:45:28 C 07 05 47.363 -05 37 20.26 q O44
2013-02-05 15:46:14 C 07 05 47.267 -05 37 18.80 q O44
2013-02-05 15:54:03 C 07 05 46.320 -05 37 04.37 q O44
2013-02-05 15:56:33 C 07 05 46.015 -05 36 59.75 q O44
2013-02-05 15:57:32 C 07 05 45.901 -05 36 58.00 q O44
2013-02-05 15:58:32 C 07 05 45.779 -05 36 56.11 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)