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
2011-03-07 19:07:24 C 02 19 18.61 +11 27 51.3 o 586
2011-03-07 19:10:26 C 02 19 19.13 +11 27 54.0 o 586
2011-03-07 19:13:56 C 02 19 19.78 +11 27 57.0 o 586
2011-03-07 19:15:28 C 02 19 20.03 +11 27 58.4 o 586
2011-03-07 19:18:31 C 02 19 20.59 +11 28 00.9 o 586
2011-03-07 19:20:02 C 02 19 20.83 +11 28 02.2 o 586
2011-03-07 19:24:35 C 02 19 21.69 +11 28 06.0 o 586
2011-03-07 19:26:06 C 02 19 21.90 +11 28 07.3 o 586
2011-03-07 19:28:18 C 02 19 22.29 +11 28 09.0 o 586
2011-03-07 19:29:49 C 02 19 22.56 +11 28 10.4 o 586
2011-03-07 19:31:21 C 02 19 22.82 +11 28 11.4 o 586
2011-03-07 19:34:24 C 02 19 23.37 +11 28 14.1 o 586
2011-03-07 19:35:55 C 02 19 23.60 +11 28 15.2 o 586
2011-03-07 19:37:26 C 02 19 23.89 +11 28 16.6 o 586
2011-03-07 19:38:58 C 02 19 24.18 +11 28 17.7 o 586
2011-03-07 19:40:28 C 02 19 24.41 +11 28 18.7 o 586
2011-03-07 19:43:27 C 02 19 24.97 +11 28 21.6 o 586
2011-03-07 19:44:59 C 02 19 25.25 +11 28 23.1 o 586
2011-03-07 19:46:30 C 02 19 25.52 +11 28 24.3 o 586
2011-03-07 19:48:01 C 02 19 25.76 +11 28 25.5 o 586
2011-03-07 19:52:35 C 02 19 26.56 +11 28 29.1 o 586
2011-03-07 19:54:07 C 02 19 26.85 +11 28 30.2 o 586
2011-03-07 19:55:37 C 02 19 27.15 +11 28 31.9 o 586
2011-03-14 02:29:33 C 02 45 56.11 +13 28 17.9 o H01
2011-03-14 02:40:01 C 02 45 57.95 +13 28 25.8 o H01
2011-03-14 02:49:36 C 02 45 59.60 +13 28 32.9 o H01
2011-03-14 03:00:24 C 02 46 01.48 +13 28 40.9 o H01
2011-05-30 05:56:53 C 07 45 50.03 +19 24 04.2 t 568
2011-05-30 05:57:58 C 07 45 50.19 +19 24 03.8 t 568
2011-05-30 05:58:57 C 07 45 50.33 +19 24 03.6 t 568
2011-05-30 06:00:04 C 07 45 50.50 +19 24 03.1 t 568
2011-05-30 06:01:04 C 07 45 50.64 +19 24 03.0 t 568
2011-05-30 06:02:07 C 07 45 50.79 +19 24 02.5 t 568
2011-05-30 06:03:13 C 07 45 50.96 +19 24 02.2 t 568
2011-05-30 06:04:17 C 07 45 51.12 +19 24 02.0 t 568
2011-05-30 06:05:24 C 07 45 51.29 +19 24 01.5 t 568
2011-05-30 06:06:30 C 07 45 51.45 +19 24 01.1 t 568
2011-05-31 06:12:45 C 07 49 24.79 +19 16 21.6 t 568
2011-05-31 06:13:45 C 07 49 24.93 +19 16 21.3 t 568
2011-05-31 06:14:44 C 07 49 25.07 +19 16 21.0 t 568
2011-05-31 06:15:50 C 07 49 25.23 +19 16 20.6 t 568
2011-05-31 06:16:50 C 07 49 25.39 +19 16 20.2 t 568
2011-06-01 06:36:24 C 07 53 00.15 +19 08 20.4 t 568
2011-06-01 06:37:23 C 07 53 00.29 +19 08 20.2 t 568
2011-06-01 06:38:23 C 07 53 00.44 +19 08 19.6 t 568
2011-06-01 06:39:23 C 07 53 00.59 +19 08 19.6 t 568
2011-07-02 06:05:07 C 09 38 36.89 +13 12 18.6 t 568
2011-07-02 06:06:07 C 09 38 37.05 +13 12 18.0 t 568
2011-07-02 06:07:07 C 09 38 37.20 +13 12 17.5 t 568
2011-07-02 06:08:09 C 09 38 37.33 +13 12 16.8 t 568
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)