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
2021-03-15 20:04:40 C 08 48 35.69 +00 13 55.7 c 095
2021-03-15 20:05:06 C 08 48 35.62 +00 13 56.6 c 095
2021-03-15 20:05:32 C 08 48 35.55 +00 13 57.5 c 095
2021-03-15 20:05:58 C 08 48 35.49 +00 13 58.3 c 095
2021-03-15 20:06:24 C 08 48 35.42 +00 13 59.2 c 095
2021-03-15 20:06:49 C 08 48 35.36 +00 14 00.0 c 095
2021-03-15 20:07:15 C 08 48 35.29 +00 14 00.9 c 095
2021-03-15 20:07:41 C 08 48 35.24 +00 14 01.7 c 095
2021-03-15 20:08:07 C 08 48 35.17 +00 14 02.3 c 095
2021-03-15 20:08:32 C 08 48 35.11 +00 14 03.2 c 095
2021-03-15 20:09:24 C 08 48 34.97 +00 14 05.1 c 095
2021-03-15 20:09:50 C 08 48 34.90 +00 14 05.7 c 095
2021-03-15 20:10:16 C 08 48 34.85 +00 14 06.7 c 095
2021-03-15 20:11:07 C 08 48 34.71 +00 14 08.4 c 095
2021-03-15 20:11:33 C 08 48 34.65 +00 14 09.2 c 095
2021-03-15 20:11:59 C 08 48 34.59 +00 14 10.0 c 095
2021-03-15 20:12:25 C 08 48 34.52 +00 14 10.7 c 095
2021-03-15 20:12:51 C 08 48 34.45 +00 14 11.6 c 095
2021-03-15 20:23:02 C 08 48 34.18 +00 14 33.8 q L47
2021-03-15 21:25:02 C 08 48 25.88 +00 16 36.5 V J27
2021-03-15 21:40:17 C 08 48 23.56 +00 17 06.3 V J27
2021-03-15 21:52:55 C 08 48 21.65 +00 17 30.9 V J27
2021-03-16 11:13:35 C 08 46 36.57 +00 43 33.8 t P66
2021-03-16 11:23:04 C 08 46 35.15 +00 43 52.3 t P66
2021-03-16 11:33:38 C 08 46 33.57 +00 44 13.3 t P66
2021-03-16 11:44:18 C 08 46 32.00 +00 44 33.4 t P66
2021-03-16 11:54:50 C 08 46 30.42 +00 44 53.9 t P66
2021-03-16 12:05:23 C 08 46 28.86 +00 45 13.8 t P66
2021-03-16 12:15:55 C 08 46 27.27 +00 45 34.8 t P66
2021-03-16 12:26:28 C 08 46 25.68 +00 45 54.6 t P66
2021-03-16 12:37:11 C 08 46 24.10 +00 46 15.9 t P66
2021-03-16 12:47:45 C 08 46 22.49 +00 46 36.2 t P66
2021-03-16 12:58:19 C 08 46 20.94 +00 46 56.5 t P66
2021-03-16 13:08:54 C 08 46 19.35 +00 47 17.2 t P66
2021-03-16 13:19:31 C 08 46 17.76 +00 47 38.0 t P66
2021-03-16 13:30:05 C 08 46 16.19 +00 47 58.3 t P66
2021-03-16 13:40:40 C 08 46 14.62 +00 48 18.6 t P66
2021-03-16 13:51:14 C 08 46 13.05 +00 48 39.4 t P66
2021-03-16 14:01:48 C 08 46 11.49 +00 48 59.8 t P66
2021-03-16 14:12:27 C 08 46 09.90 +00 49 20.2 t P66
2021-03-16 14:23:01 C 08 46 08.34 +00 49 40.6 t P66
2021-03-16 14:33:32 C 08 46 06.80 +00 50 00.7 t P66
2021-03-16 14:44:07 C 08 46 05.25 +00 50 21.1 t P66
2021-03-16 14:54:48 C 08 46 03.70 +00 50 42.1 t P66
2021-03-16 15:05:26 C 08 46 02.14 +00 51 02.4 t P66
2021-03-16 15:16:06 C 08 46 00.59 +00 51 23.0 t P66
2021-03-16 15:27:24 C 08 45 58.98 +00 51 44.5 t P66
2021-03-16 15:37:58 C 08 45 57.40 +00 52 05.0 t P66
2021-03-16 15:43:13 C 08 45 56.68 +00 52 15.3 t P66
2021-03-16 16:12:30 C 08 45 55.16 +00 52 57.0 V N82
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)