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
2021-03-11 17:06:35 C 09 03 11.99 -03 03 42.1 Y N42
2021-03-11 17:07:32 C 09 03 11.82 -03 03 40.2 Y N42
2021-03-11 17:08:30 C 09 03 11.66 -03 03 38.3 Y N42
2021-03-11 17:09:27 C 09 03 11.50 -03 03 36.4 Y N42
2021-03-11 17:10:25 C 09 03 11.32 -03 03 34.4 Y N42
2021-03-11 17:11:22 C 09 03 11.15 -03 03 32.4 Y N42
2021-03-11 17:11:22 C 09 03 12.73 -03 03 11.3 q M44
2021-03-11 17:12:20 C 09 03 10.98 -03 03 30.4 Y N42
2021-03-11 17:13:18 C 09 03 10.81 -03 03 28.4 Y N42
2021-03-11 17:14:15 C 09 03 10.65 -03 03 26.6 Y N42
2021-03-11 17:15:12 C 09 03 10.48 -03 03 24.6 Y N42
2021-03-11 17:16:09 C 09 03 10.32 -03 03 22.9 Y N42
2021-03-11 17:17:07 C 09 03 10.15 -03 03 20.8 Y N42
2021-03-11 17:18:04 C 09 03 09.98 -03 03 18.8 Y N42
2021-03-11 17:19:01 C 09 03 09.80 -03 03 16.8 Y N42
2021-03-11 17:19:58 C 09 03 09.65 -03 03 15.0 Y N42
2021-03-11 17:20:55 C 09 03 09.48 -03 03 13.1 Y N42
2021-03-11 17:22:38 C 09 03 09.19 -03 03 09.7 Y N42
2021-03-11 17:23:36 C 09 03 09.01 -03 03 07.7 Y N42
2021-03-11 17:24:12 C 09 03 10.53 -03 02 46.3 q M44
2021-03-11 17:24:33 C 09 03 08.84 -03 03 05.6 Y N42
2021-03-11 17:25:30 C 09 03 08.68 -03 03 03.7 Y N42
2021-03-11 17:26:28 C 09 03 08.51 -03 03 01.8 Y N42
2021-03-11 17:27:25 C 09 03 08.34 -03 02 59.9 Y N42
2021-03-11 17:28:22 C 09 03 08.18 -03 02 57.9 Y N42
2021-03-11 17:29:20 C 09 03 08.00 -03 02 55.9 Y N42
2021-03-11 17:30:17 C 09 03 07.83 -03 02 53.9 Y N42
2021-03-11 17:31:15 C 09 03 07.68 -03 02 52.1 Y N42
2021-03-11 17:32:12 C 09 03 07.51 -03 02 50.1 Y N42
2021-03-11 17:33:09 C 09 03 07.35 -03 02 48.2 Y N42
2021-03-11 17:34:07 C 09 03 07.17 -03 02 46.3 Y N42
2021-03-11 17:35:04 C 09 03 07.00 -03 02 44.3 Y N42
2021-03-11 17:36:01 C 09 03 06.84 -03 02 42.5 Y N42
2021-03-11 17:36:59 C 09 03 06.67 -03 02 40.5 Y N42
2021-03-11 17:37:56 C 09 03 06.52 -03 02 38.6 Y N42
2021-03-11 17:38:53 C 09 03 06.34 -03 02 36.6 Y N42
2021-03-11 17:39:51 C 09 03 06.17 -03 02 34.7 Y N42
2021-03-11 17:40:48 C 09 03 06.00 -03 02 32.8 Y N42
2021-03-11 17:41:45 C 09 03 05.85 -03 02 30.9 Y N42
2021-03-11 17:42:43 C 09 03 05.67 -03 02 28.9 Y N42
2021-03-11 17:43:05 C 09 03 07.25 -03 02 08.9 q M44
2021-03-11 17:43:40 C 09 03 05.51 -03 02 27.1 Y N42
2021-03-11 17:44:38 C 09 03 05.34 -03 02 25.0 Y N42
2021-03-11 17:45:35 C 09 03 05.17 -03 02 23.0 Y N42
2021-03-11 17:46:32 C 09 03 05.01 -03 02 21.1 Y N42
2021-03-11 17:47:30 C 09 03 04.84 -03 02 19.1 Y N42
2021-03-11 17:48:27 C 09 03 04.67 -03 02 17.2 Y N42
2021-03-11 17:55:30 C 09 03 04.60 -03 02 14.3 q 168
2021-03-11 18:29:30 C 09 02 58.78 -03 01 05.3 q 168
2021-03-11 18:39:30 C 09 02 57.08 -03 00 45.0 q 168
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)