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 21:08:08 C 07 00 40.84 -04 01 11.9 u C40
2013-02-07 21:09:39 C 07 00 40.68 -04 01 09.2 u C40
2013-02-07 21:14:28 C 07 00 40.19 -04 01 00.4 u C40
2013-02-07 21:15:16 C 07 00 41.71 -04 00 58.9 q B88
2013-02-07 21:15:59 C 07 00 40.04 -04 00 58.0 u C40
2013-02-07 21:17:30 C 07 00 39.90 -04 00 55.2 u C40
2013-02-07 21:19:02 C 07 00 39.74 -04 00 52.6 u C40
2013-02-07 21:20:33 C 07 00 39.58 -04 00 49.7 u C40
2013-02-07 21:22:05 C 07 00 39.46 -04 00 47.1 u C40
2013-02-07 21:23:36 C 07 00 39.28 -04 00 44.3 u C40
2013-02-07 21:24:47 C 07 00 40.75 -04 00 43.4 r 147
2013-02-07 21:25:07 C 07 00 39.13 -04 00 41.8 u C40
2013-02-07 21:26:39 C 07 00 38.99 -04 00 39.1 u C40
2013-02-07 21:28:10 C 07 00 38.83 -04 00 36.5 u C40
2013-02-07 21:29:42 C 07 00 38.68 -04 00 33.8 u C40
2013-02-07 21:31:14 C 07 00 38.53 -04 00 30.9 u C40
2013-02-07 21:32:44 C 07 00 38.38 -04 00 28.3 u C40
2013-02-07 21:34:16 C 07 00 38.24 -04 00 25.6 u C40
2013-02-07 21:35:47 C 07 00 38.09 -04 00 23.0 u C40
2013-02-07 21:38:50 C 07 00 37.76 -04 00 17.3 u C40
2013-02-07 21:40:21 C 07 00 37.62 -04 00 14.7 u C40
2013-02-07 21:41:53 C 07 00 37.47 -04 00 12.2 u C40
2013-02-07 21:43:24 C 07 00 37.32 -04 00 09.2 u C40
2013-02-07 21:44:56 C 07 00 37.19 -04 00 06.5 u C40
2013-02-07 21:46:27 C 07 00 37.03 -04 00 03.9 u C40
2013-02-07 21:47:58 C 07 00 36.87 -04 00 01.2 u C40
2013-02-07 21:49:18 C 07 00 38.26 -04 00 00.1 r 147
2013-02-07 21:49:30 C 07 00 36.71 -03 59 58.5 u C40
2013-02-07 21:51:02 C 07 00 36.57 -03 59 55.7 u C40
2013-02-07 21:52:32 C 07 00 36.42 -03 59 53.1 u C40
2013-02-07 22:02:28 C 07 00 35.46 -03 59 35.7 u C40
2013-02-07 22:02:48 C 07 00 36.90 -03 59 36.3 r 147
2013-02-07 22:04:00 C 07 00 35.29 -03 59 32.5 u C40
2013-02-07 22:05:32 C 07 00 35.14 -03 59 30.0 u C40
2013-02-07 22:07:03 C 07 00 35.00 -03 59 27.3 u C40
2013-02-07 22:08:34 C 07 00 34.85 -03 59 24.6 u C40
2013-02-07 22:10:05 C 07 00 34.70 -03 59 21.6 u C40
2013-02-07 22:11:37 C 07 00 34.55 -03 59 19.0 u C40
2013-02-07 22:20:46 C 07 00 33.67 -03 59 03.0 u C40
2013-02-07 22:22:17 C 07 00 33.53 -03 59 00.2 u C40
2013-02-07 22:25:20 C 07 00 33.23 -03 58 55.2 u C40
2013-02-07 22:26:51 C 07 00 33.06 -03 58 52.0 u C40
2013-02-07 22:28:23 C 07 00 32.94 -03 58 49.4 u C40
2013-02-08 16:06:04 C 06 59 07.43 -03 27 54.4 u C40
2013-02-08 16:07:35 C 06 59 07.28 -03 27 52.1 u C40
2013-02-08 16:18:15 C 06 59 06.27 -03 27 33.2 u C40
2013-02-08 16:21:18 C 06 59 05.99 -03 27 27.6 u C40
2013-02-08 16:22:49 C 06 59 05.86 -03 27 25.4 u C40
2013-02-08 16:24:21 C 06 59 05.72 -03 27 22.5 u C40
2013-02-08 16:26:07 C 06 59 05.54 -03 27 19.6 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)