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
2021-03-05 17:39:31 C 09 28 03.81 -07 52 10.8 V A84
2021-03-05 17:41:20 C 09 28 03.44 -07 52 07.4 V A84
2021-03-05 17:43:10 C 09 28 03.07 -07 52 03.7 V A84
2021-03-05 17:45:00 C 09 28 02.71 -07 52 00.3 V A84
2021-03-05 17:46:50 C 09 28 02.35 -07 51 56.7 V A84
2021-03-05 17:48:39 C 09 28 02.00 -07 51 53.2 V A84
2021-03-05 17:50:28 C 09 28 01.63 -07 51 49.6 V A84
2021-03-05 17:52:19 C 09 28 01.27 -07 51 46.2 V A84
2021-03-05 17:54:05 S 09 27 15.802 -08 03 22.97 V C57
2021-03-05 17:54:05 s 1 -183183.01 3 +78409.512 6940.0 C57
2021-03-05 17:54:09 C 09 28 00.91 -07 51 42.6 V A84
2021-03-05 17:55:58 C 09 28 00.54 -07 51 39.0 V A84
2021-03-05 17:56:23 C 09 27 59.70 -07 51 46.5 V C40
2021-03-05 17:57:48 C 09 28 00.18 -07 51 35.6 V A84
2021-03-05 17:59:28 C 09 27 59.08 -07 51 40.5 V C40
2021-03-05 17:59:38 C 09 27 59.81 -07 51 32.0 V A84
2021-03-05 18:01:27 C 09 27 59.45 -07 51 28.4 V A84
2021-03-05 18:03:16 C 09 27 59.09 -07 51 25.0 V A84
2021-03-05 18:05:07 C 09 27 58.72 -07 51 21.3 V A84
2021-03-05 18:06:57 C 09 27 58.34 -07 51 17.9 V A84
2021-03-05 18:07:11 C 09 27 57.55 -07 51 25.4 V C40
2021-03-05 18:08:42 C 09 27 57.24 -07 51 22.3 V C40
2021-03-05 18:08:46 C 09 27 57.99 -07 51 14.2 V A84
2021-03-05 18:10:16 C 09 27 56.93 -07 51 19.4 V C40
2021-03-05 18:10:35 C 09 27 57.63 -07 51 10.8 V A84
2021-03-05 18:11:47 C 09 27 56.63 -07 51 16.6 V C40
2021-03-05 18:12:26 C 09 27 57.26 -07 51 07.2 V A84
2021-03-05 18:14:15 C 09 27 56.90 -07 51 03.7 V A84
2021-03-05 18:16:05 C 09 27 56.53 -07 51 00.1 V A84
2021-03-05 18:16:25 C 09 27 55.71 -07 51 07.4 V C40
2021-03-05 18:17:54 C 09 27 56.15 -07 50 56.6 V A84
2021-03-05 18:19:45 C 09 27 55.80 -07 50 53.0 V A84
2021-03-05 18:21:34 C 09 27 55.43 -07 50 49.5 V A84
2021-03-05 18:23:24 C 09 27 55.07 -07 50 46.0 V A84
2021-03-05 18:25:14 C 09 27 54.71 -07 50 42.5 V A84
2021-03-05 18:27:04 C 09 27 54.34 -07 50 38.9 V A84
2021-03-05 18:27:55 C 09 27 54.64 -07 50 47.5 t G12
2021-03-05 18:28:53 C 09 27 53.98 -07 50 35.3 V A84
2021-03-05 18:30:42 C 09 27 53.60 -07 50 31.8 V A84
2021-03-05 18:31:58 C 09 27 52.60 -07 50 37.2 V C40
2021-03-05 18:32:33 C 09 27 53.24 -07 50 28.3 V A84
2021-03-05 18:34:22 C 09 27 52.87 -07 50 24.7 V A84
2021-03-05 18:35:02 C 09 27 51.99 -07 50 31.2 V C40
2021-03-05 18:36:12 C 09 27 52.50 -07 50 21.2 V A84
2021-03-05 18:37:35 C 09 27 52.77 -07 50 29.1 t G12
2021-03-05 18:38:01 C 09 27 52.14 -07 50 17.7 V A84
2021-03-05 18:38:07 C 09 27 51.37 -07 50 25.2 V C40
2021-03-05 18:39:41 C 09 27 51.06 -07 50 22.3 V C40
2021-03-05 18:39:52 C 09 27 51.77 -07 50 14.1 V A84
2021-03-05 18:41:41 C 09 27 51.40 -07 50 10.5 V A84
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)