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
2005-02-04 02:35:13 C 04 21 16.30 +04 44 20.6 r 448
2005-02-04 02:40:08 C 04 21 16.85 +04 44 26.2 r 448
2005-02-04 02:45:48 C 04 21 17.07 +04 44 28.2 r 734
2005-02-04 02:48:46 C 04 21 17.41 +04 44 32.1 r 734
2005-02-04 02:51:44 C 04 21 17.73 +04 44 35.8 r 734
2005-02-04 02:54:42 C 04 21 18.07 +04 44 38.6 r 734
2005-02-04 18:56:52 C 04 23 13.69 +05 02 39.1 r 201
2005-02-04 19:06:28 C 04 23 14.74 +05 02 50.0 r 201
2005-02-04 19:13:26 C 04 23 15.56 +05 02 57.5 r 201
2005-02-04 23:44:00 C 04 23 48.18 +05 08 01.4 r 932
2005-02-05 00:08:00 C 04 23 50.81 +05 08 28.0 r 932
2005-02-05 00:18:00 C 04 23 51.90 +05 08 39.1 r 932
2005-02-05 01:16:48 C 04 23 59.17 +05 09 45.9 r 734
2005-02-05 01:21:14 C 04 23 59.67 +05 09 50.6 r 734
2005-02-05 01:25:05 C 04 24 00.08 +05 09 55.0 r 734
2005-02-05 02:32:09 C 04 24 07.46 +05 11 09.2 r 734
2005-02-05 18:30:23 C 04 26 01.34 +05 28 36.1 o 198
2005-02-05 18:37:00 C 04 26 02.07 +05 28 43.2 o 198
2005-02-05 18:41:16 C 04 26 02.54 +05 28 47.9 o 198
2005-02-05 18:42:53 C 04 26 02.26 +05 28 44.5 o 084
2005-02-05 18:44:28 C 04 26 02.78 +05 28 50.8 c 113
2005-02-05 18:46:25 C 04 26 03.11 +05 28 53.5 o 198
2005-02-05 18:47:32 C 04 26 02.79 +05 28 49.4 o 084
2005-02-05 18:49:14 C 04 26 03.31 +05 28 55.5 c 113
2005-02-05 18:52:05 C 04 26 03.73 +05 28 59.6 o 198
2005-02-05 18:55:35 C 04 26 04.03 +05 29 02.3 c 113
2005-02-05 18:59:12 C 04 26 04.50 +05 29 07.4 o 198
2005-02-05 19:27:33 C 04 26 07.55 +05 29 39.1 r A30
2005-02-05 19:29:04 C 04 26 07.72 +05 29 40.9 r A30
2005-02-05 19:29:26 C 04 26 07.76 +05 29 41.2 r A30
2005-02-05 19:30:15 C 04 26 07.84 +05 29 42.2 r A30
2005-02-05 19:38:11 C 04 26 08.70 +05 29 50.6 r A30
2005-02-06 19:41:32 C 04 28 58.04 +05 55 35.7 c 639
2005-02-06 19:46:06 C 04 28 58.51 +05 55 40.9 c 639
2005-02-06 19:56:51 C 04 28 59.63 +05 55 52.9 c 246
2005-02-06 19:57:46 C 04 28 59.71 +05 55 53.8 c 246
2005-02-06 19:57:59 C 04 28 59.76 +05 55 53.5 c 639
2005-02-06 19:58:41 C 04 28 59.82 +05 55 55.2 c 246
2005-02-06 20:01:59 C 04 29 00.28 +05 55 57.7 c 639
2005-02-06 20:04:37 C 04 29 00.54 +05 56 00.6 c 639
2005-02-06 20:14:14 C 04 29 01.57 +05 56 10.2 c 639
2005-02-06 20:19:05 C 04 29 02.09 +05 56 14.9 c 639
2005-02-07 01:46:25 C 04 29 41.34 +06 02 12.3 c 711
2005-02-07 01:54:42 C 04 29 42.28 +06 02 20.9 c 711
2005-02-07 02:02:58 C 04 29 43.18 +06 02 29.5 c 711
2005-02-07 18:20:41 C 04 31 36.58 +06 19 19.3 c A41
2005-02-07 18:25:27 C 04 31 37.26 +06 19 22.8 o 198
2005-02-07 18:29:07 C 04 31 37.65 +06 19 26.6 o 198
2005-02-07 18:33:18 C 04 31 38.10 +06 19 30.9 o 198
2005-02-07 18:38:00 C 04 31 38.61 +06 19 35.8 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)