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
2013-02-08 16:27:38 C 06 59 05.42 -03 27 17.2 u C40
2013-02-08 16:29:09 C 06 59 05.27 -03 27 14.2 u C40
2013-02-08 16:30:41 C 06 59 05.11 -03 27 12.0 u C40
2013-02-08 17:01:18 C 06 59 02.26 -03 26 18.7 u C40
2013-02-08 17:05:20 C 06 59 01.88 -03 26 11.8 u C40
2013-02-08 17:17:28 C 06 59 00.72 -03 25 50.7 u C40
2013-02-08 17:19:30 C 06 59 00.52 -03 25 47.5 u C40
2013-02-08 17:23:33 C 06 59 00.16 -03 25 40.0 u C40
2013-02-08 17:29:37 C 06 58 59.57 -03 25 29.8 u C40
2013-02-08 17:31:38 C 06 58 59.36 -03 25 26.3 u C40
2013-02-08 17:33:40 C 06 58 59.18 -03 25 22.8 u C40
2013-02-08 18:14:36 C 06 58 56.29 -03 24 14.7 u 557
2013-02-08 19:16:41 C 06 58 50.54 -03 22 27.5 u 557
2013-02-08 19:54:19 C 06 58 46.10 -03 21 18.7 q B17
2013-02-08 20:24:46 C 06 58 43.23 -03 20 25.8 q B17
2013-02-08 20:51:53 C 06 58 42.82 -03 19 36.2 u I61
2013-02-08 20:53:19 C 06 58 42.54 -03 19 30.0 w I88
2013-02-08 20:54:30 C 06 58 40.38 -03 19 34.1 q B17
2013-02-08 20:59:15 C 06 58 41.97 -03 19 19.7 w I88
2013-02-08 21:03:29 C 06 58 41.59 -03 19 12.7 w I88
2013-02-08 21:27:39 C 06 58 38.24 -03 18 40.5 u 557
2013-02-08 21:58:26 C 06 58 36.49 -03 17 41.2 u I61
2013-02-08 22:19:45 C 06 58 32.23 -03 17 05.3 u C40
2013-02-08 22:21:46 C 06 58 32.04 -03 17 02.0 u C40
2013-02-08 22:23:47 C 06 58 31.87 -03 16 58.4 u C40
2013-02-08 22:25:49 C 06 58 31.68 -03 16 55.1 u C40
2013-02-08 22:27:50 C 06 58 31.49 -03 16 51.4 u C40
2013-02-08 22:37:56 C 06 58 30.59 -03 16 33.8 u C40
2013-02-08 22:47:02 C 06 58 30.87 -03 16 22.5 u 557
2013-02-09 18:48:29 C 06 57 00.39 -02 41 52.5 c J08
2013-02-09 18:51:08 C 06 57 00.04 -02 41 49.8 q C27
2013-02-09 18:57:04 C 06 56 59.53 -02 41 39.7 q C27
2013-02-09 19:17:01 C 06 56 57.92 -02 41 04.7 c J08
2013-02-09 20:16:48 C 06 56 52.51 -02 39 24.6 q C27
2013-02-09 21:05:03 C 06 56 48.23 -02 38 02.9 q C27
2013-02-09 21:12:02 C 06 56 47.61 -02 37 51.1 q C27
2013-02-09 21:50:11 C 06 56 44.20 -02 36 46.5 q C27
2013-02-09 21:55:39 C 06 56 43.72 -02 36 37.1 q C27
2013-02-09 22:55:28 C 06 56 38.56 -02 34 51.3 u I56
2013-02-09 23:02:21 C 06 56 37.91 -02 34 40.3 u I56
2013-02-09 23:08:42 C 06 56 37.44 -02 34 29.3 u I56
2013-02-10 20:41:54 C 06 55 05.63 -01 58 31.2 o 639
2013-02-10 20:48:04 C 06 55 05.13 -01 58 20.6 o 639
2013-02-10 20:53:00 C 06 55 04.84 -01 58 08.0 C91
2013-02-10 20:55:59 C 06 55 04.59 -01 58 03.3 C91
2013-02-10 20:57:45 C 06 55 04.35 -01 58 04.8 o 639
2013-02-10 21:00:00 C 06 55 04.27 -01 57 56.4 C91
2013-02-10 21:02:59 C 06 55 04.01 -01 57 51.2 C91
2013-02-10 21:04:14 C 06 55 03.83 -01 57 54.0 o 639
2013-02-10 22:34:20 C 06 54 56.55 -01 55 23.7 u 557
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)