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
2021-02-04 22:11:22 C 11 21 16.92 -19 33 51.9 V 186
2021-02-04 22:16:33 C 11 21 16.38 -19 33 51.2 V 186
2021-02-04 22:21:11 C 11 21 15.86 -19 33 51.5 V 186
2021-02-05 00:34:05 C 11 21 03.66 -19 33 49.3 V L54
2021-02-05 00:58:59 C 11 21 00.95 -19 33 48.4 V L54
2021-02-05 01:24:30 C 11 20 58.18 -19 33 47.3 V L54
2021-02-05 09:43:04 C 11 20 10.03 -19 33 15.1 o 691
2021-02-05 11:38:23 C 11 19 56.95 -19 33 06.1 o 691
2021-02-05 13:00:26 C 11 19 47.85 -19 32 57.1 o 691
2021-02-05 21:32:03 C 11 19 00.63 -19 32 30.2 V C40
2021-02-05 21:42:51 C 11 18 59.41 -19 32 29.5 V C40
2021-02-05 21:50:32 C 11 18 58.50 -19 32 28.7 V C40
2021-02-06 09:11:17 C 11 17 47.44 -19 31 18.4 o 290
2021-02-06 09:12:16 C 11 17 47.32 -19 31 18.6 o 290
2021-02-06 09:13:14 C 11 17 47.22 -19 31 18.4 o 290
2021-02-06 09:44:16 C 11 17 43.49 -19 31 15.4 o 290
2021-02-06 09:45:14 C 11 17 43.37 -19 31 15.1 o 290
2021-02-06 09:46:14 C 11 17 43.27 -19 31 15.2 o 290
2021-02-06 09:47:12 C 11 17 43.15 -19 31 15.0 o 290
2021-02-06 09:48:10 C 11 17 43.03 -19 31 14.6 o 290
2021-02-06 09:49:07 C 11 17 42.91 -19 31 14.7 o 290
2021-02-06 11:51:45 C 11 17 31.02 -19 30 51.3 V T08
2021-02-06 11:56:24 C 11 17 30.46 -19 30 50.7 V T08
2021-02-06 12:01:03 C 11 17 29.89 -19 30 50.3 V T08
2021-02-06 12:16:33 C 11 17 28.00 -19 30 48.7 V T08
2021-02-06 22:01:52 C 11 16 28.18 -19 28 49.2 V 221
2021-02-06 22:03:38 C 11 16 27.98 -19 28 49.1 V 221
2021-02-06 22:05:23 C 11 16 27.76 -19 28 48.9 V 221
2021-02-06 22:07:07 C 11 16 27.55 -19 28 48.8 V 221
2021-02-06 22:08:51 C 11 16 27.34 -19 28 48.7 V 221
2021-02-06 22:10:37 C 11 16 27.13 -19 28 48.5 V 221
2021-02-06 22:17:51 C 11 16 26.27 -19 28 48.0 V 221
2021-02-06 22:19:37 C 11 16 26.05 -19 28 47.8 V 221
2021-02-06 22:21:31 C 11 16 25.81 -19 28 47.6 V 221
2021-02-06 22:23:18 C 11 16 25.61 -19 28 47.4 V 221
2021-02-06 22:25:02 C 11 16 25.40 -19 28 47.2 V 221
2021-02-06 22:26:48 C 11 16 25.18 -19 28 47.1 V 221
2021-02-06 22:28:32 C 11 16 24.97 -19 28 47.0 V 221
2021-02-06 22:30:19 C 11 16 24.76 -19 28 46.9 V 221
2021-02-06 22:32:04 C 11 16 24.55 -19 28 46.6 V 221
2021-02-06 22:33:49 C 11 16 24.32 -19 28 46.4 V 221
2021-02-06 22:35:36 C 11 16 24.13 -19 28 46.4 V 221
2021-02-06 22:37:26 C 11 16 23.90 -19 28 46.2 V 221
2021-02-06 22:39:12 C 11 16 23.68 -19 28 45.9 V 221
2021-02-06 22:40:56 C 11 16 23.47 -19 28 45.9 V 221
2021-02-06 22:42:48 C 11 16 23.25 -19 28 45.7 V 221
2021-02-06 22:44:32 C 11 16 23.04 -19 28 45.6 V 221
2021-02-06 22:46:23 C 11 16 22.81 -19 28 45.3 V 221
2021-02-06 22:48:06 C 11 16 22.59 -19 28 45.2 V 221
2021-02-06 22:49:52 C 11 16 22.38 -19 28 45.1 V 221
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)