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
2013-02-07 18:36:02 C 07 00 56.28 -04 05 41.5 u C40
2013-02-07 18:37:34 C 07 00 56.13 -04 05 38.9 u C40
2013-02-07 18:39:05 C 07 00 55.96 -04 05 36.2 u C40
2013-02-07 18:50:55 C 07 00 54.78 -04 05 15.2 u C40
2013-02-07 18:52:26 C 07 00 54.62 -04 05 12.7 u C40
2013-02-07 18:53:57 C 07 00 54.46 -04 05 09.9 u C40
2013-02-07 18:55:28 C 07 00 54.31 -04 05 07.1 u C40
2013-02-07 18:57:00 C 07 00 54.14 -04 05 04.4 u C40
2013-02-07 18:58:32 C 07 00 54.00 -04 05 02.0 u C40
2013-02-07 19:00:03 C 07 00 53.84 -04 04 59.1 u C40
2013-02-07 19:01:34 C 07 00 53.68 -04 04 56.3 u C40
2013-02-07 19:03:06 C 07 00 53.53 -04 04 53.6 u C40
2013-02-07 19:04:37 C 07 00 53.37 -04 04 50.9 u C40
2013-02-07 19:06:09 C 07 00 53.21 -04 04 48.1 u C40
2013-02-07 19:07:40 C 07 00 53.06 -04 04 45.7 u C40
2013-02-07 19:09:12 C 07 00 52.90 -04 04 42.9 u C40
2013-02-07 19:10:43 C 07 00 52.75 -04 04 40.1 u C40
2013-02-07 19:12:14 C 07 00 52.59 -04 04 37.6 u C40
2013-02-07 19:13:46 C 07 00 52.42 -04 04 34.8 u C40
2013-02-07 19:15:17 C 07 00 52.27 -04 04 32.1 u C40
2013-02-07 19:16:49 C 07 00 52.12 -04 04 29.5 u C40
2013-02-07 19:18:21 C 07 00 51.96 -04 04 26.7 u C40
2013-02-07 19:19:52 C 07 00 51.80 -04 04 24.0 u C40
2013-02-07 19:24:03 C 07 00 52.58 -04 04 19.9 u 557
2013-02-07 19:25:58 C 07 00 51.20 -04 04 13.4 u C40
2013-02-07 19:27:29 C 07 00 51.04 -04 04 10.5 u C40
2013-02-07 19:29:01 C 07 00 50.87 -04 04 07.7 u C40
2013-02-07 19:30:31 C 07 00 50.72 -04 04 05.2 u C40
2013-02-07 20:11:21 C 07 00 48.21 -04 02 51.9 q B88
2013-02-07 20:25:28 C 07 00 45.13 -04 02 27.7 u C40
2013-02-07 20:26:58 C 07 00 44.98 -04 02 24.9 u C40
2013-02-07 20:29:17 C 07 00 46.05 -04 02 25.0 u 557
2013-02-07 20:33:05 C 07 00 44.35 -04 02 14.4 u C40
2013-02-07 20:34:36 C 07 00 44.21 -04 02 11.3 u C40
2013-02-07 20:36:07 C 07 00 44.04 -04 02 08.8 u C40
2013-02-07 20:37:39 C 07 00 43.90 -04 02 05.9 u C40
2013-02-07 20:39:10 C 07 00 43.74 -04 02 03.4 u C40
2013-02-07 20:40:24 C 07 00 45.26 -04 02 00.7 q B88
2013-02-07 20:40:42 C 07 00 43.59 -04 02 00.6 u C40
2013-02-07 20:42:13 C 07 00 43.43 -04 01 57.9 u C40
2013-02-07 20:43:45 C 07 00 43.28 -04 01 55.2 u C40
2013-02-07 20:45:16 C 07 00 43.13 -04 01 52.5 u C40
2013-02-07 20:46:47 C 07 00 42.98 -04 01 49.9 u C40
2013-02-07 20:48:19 C 07 00 42.81 -04 01 46.9 u C40
2013-02-07 20:55:56 C 07 00 42.06 -04 01 33.5 u C40
2013-02-07 20:57:27 C 07 00 41.90 -04 01 30.7 u C40
2013-02-07 21:00:31 C 07 00 41.61 -04 01 25.4 u C40
2013-02-07 21:03:33 C 07 00 41.29 -04 01 20.0 u C40
2013-02-07 21:05:04 C 07 00 41.13 -04 01 17.4 u C40
2013-02-07 21:06:36 C 07 00 40.97 -04 01 14.6 u C40
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)