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
2005-01-11 22:07:28 C 02 56 12.55 -10 28 05.3 r A13
2005-01-11 23:28:01 C 02 56 30.60 -10 23 55.9 r I77
2005-01-11 23:29:49 C 02 56 30.95 -10 23 52.0 r I77
2005-01-11 23:31:37 C 02 56 31.30 -10 23 47.8 r I77
2005-01-12 10:31:20 C 02 58 48.82 -09 58 16.7 r 423
2005-01-12 10:41:19 C 02 58 50.80 -09 57 54.1 r 423
2005-01-12 10:49:20 C 02 58 52.30 -09 57 35.8 r 423
2005-01-12 11:00:19 C 02 58 54.41 -09 57 10.7 r 423
2005-01-12 19:14:44 C 03 00 37.46 -09 39 53.1 c 951
2005-01-12 19:48:46 C 03 00 44.01 -09 38 37.1 c 951
2005-01-12 20:23:41 C 03 00 50.68 -09 37 18.0 c 951
2005-01-13 18:52:10 C 03 05 19.77 -08 47 22.4 17.5 i 071
2005-01-13 18:59:55 C 03 05 21.18 -08 47 05.7 17.3 i 071
2005-01-13 19:08:43 C 03 05 22.76 -08 46 45.0 17.4 i 071
2005-01-13 19:49:03 C 03 05 31.64 -08 45 24.8 r J95
2005-01-13 19:59:38 C 03 05 33.62 -08 45 02.4 r J95
2005-01-13 20:10:02 C 03 05 35.53 -08 44 39.6 r J95
2005-01-14 01:54:08 C 03 06 43.04 -08 31 56.8 r 735
2005-01-14 03:30:47 C 03 07 00.21 -08 28 32.1 r H41
2005-01-14 03:34:37 C 03 07 00.90 -08 28 23.7 r H41
2005-01-14 03:36:38 C 03 07 01.32 -08 28 19.2 r H41
2005-01-14 03:37:12 C 03 07 01.46 -08 28 13.3 r 735
2005-01-14 03:38:23 C 03 07 01.61 -08 28 15.6 r H41
2005-01-14 03:40:45 C 03 07 02.03 -08 28 10.6 r H41
2005-01-14 04:31:30 C 03 07 11.25 -08 26 15.0 r 735
2005-01-14 05:44:38 C 03 07 24.63 -08 23 35.9 r 735
2005-01-14 18:13:01 C 03 09 51.43 -07 57 16.4 c A62
2005-01-14 18:14:03 C 03 09 51.62 -07 57 14.6 c A62
2005-01-14 18:15:05 C 03 09 51.81 -07 57 12.2 c A62
2005-01-14 18:16:07 C 03 09 51.99 -07 57 10.0 c A62
2005-01-14 18:17:09 C 03 09 52.18 -07 57 07.8 c A62
2005-01-14 18:18:11 C 03 09 52.37 -07 57 05.5 c A62
2005-01-14 18:19:13 C 03 09 52.55 -07 57 03.5 c A62
2005-01-14 18:20:15 C 03 09 52.74 -07 57 01.3 c A62
2005-01-14 18:21:17 C 03 09 52.93 -07 56 59.1 c A62
2005-01-14 18:22:19 C 03 09 53.12 -07 56 56.8 c A62
2005-01-14 18:23:21 C 03 09 53.30 -07 56 54.5 c A62
2005-01-14 18:24:23 C 03 09 53.49 -07 56 52.5 c A62
2005-01-14 18:25:25 C 03 09 53.68 -07 56 50.5 c A62
2005-01-14 18:26:27 C 03 09 53.87 -07 56 48.2 c A62
2005-01-14 18:27:29 C 03 09 54.04 -07 56 46.1 c A62
2005-01-14 18:28:30 C 03 09 54.21 -07 56 44.1 c A62
2005-01-14 18:28:58 C 03 09 54.29 -07 56 43.0 c A62
2005-01-14 18:29:27 C 03 09 54.37 -07 56 42.2 c A62
2005-01-14 18:29:57 C 03 09 54.47 -07 56 41.1 c A62
2005-01-14 19:55:09 C 03 10 09.58 -07 53 40.9 o 198
2005-01-14 19:58:16 C 03 10 10.15 -07 53 34.2 o 198
2005-01-14 20:01:25 C 03 10 10.72 -07 53 27.6 o 198
2005-01-14 20:05:35 C 03 10 11.47 -07 53 18.8 o 198
2005-01-14 20:06:06 C 03 10 11.56 -07 53 17.7 o 198
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)