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
2012-12-31 02:12:38 C 10 03 33.41 -27 04 59.4 o 071
2012-12-31 02:14:59 C 10 03 32.80 -27 04 58.8 o 071
2012-12-31 02:17:20 C 10 03 32.28 -27 04 57.9 o 071
2012-12-31 02:19:41 C 10 03 31.68 -27 04 57.2 o 071
2012-12-31 02:22:04 C 10 03 31.14 -27 04 56.4 o 071
2012-12-31 02:25:37 C 10 03 30.26 -27 04 55.3 o 071
2012-12-31 02:27:59 C 10 03 29.70 -27 04 54.5 o 071
2012-12-31 02:30:20 C 10 03 29.11 -27 04 53.8 o 071
2012-12-31 02:32:41 C 10 03 28.55 -27 04 53.1 o 071
2012-12-31 02:35:02 C 10 03 27.98 -27 04 52.2 o 071
2013-01-02 01:14:33 C 09 53 04.33 -26 48 01.6 o 071
2013-01-02 01:16:54 C 09 53 03.56 -26 48 00.6 o 071
2013-01-02 01:19:17 C 09 53 03.13 -26 47 59.6 o 071
2013-01-02 01:21:58 C 09 53 02.40 -26 47 58.4 o 071
2013-01-02 01:24:19 C 09 53 01.78 -26 47 57.4 o 071
2013-01-02 01:26:42 C 09 53 01.19 -26 47 56.4 o 071
2013-01-02 01:41:27 C 09 52 57.68 -26 47 50.2 o 071
2013-01-02 01:43:52 C 09 52 57.01 -26 47 48.8 o 071
2013-01-02 01:46:19 C 09 52 56.31 -26 47 47.1 o 071
2013-01-02 01:48:43 C 09 52 55.72 -26 47 46.9 o 071
2013-01-02 01:51:11 C 09 52 55.08 -26 47 45.9 o 071
2013-01-02 01:53:35 C 09 52 54.56 -26 47 44.4 o 071
2013-01-02 01:58:03 C 09 52 53.56 -26 47 42.0 o 071
2013-01-02 02:04:54 C 09 52 51.94 -26 47 39.9 o 071
2013-01-02 02:08:17 C 09 52 50.86 -26 47 37.4 o 071
2013-01-02 02:15:08 C 09 52 49.26 -26 47 36.4 o 071
2013-01-02 02:20:18 C 09 52 48.00 -26 47 32.8 o 071
2013-01-02 02:27:14 C 09 52 46.23 -26 47 29.0 o 071
2013-01-02 02:30:36 C 09 52 45.42 -26 47 28.5 o 071
2013-01-04 00:30:23 C 09 42 11.83 -26 24 35.1 o 071
2013-01-04 00:33:13 C 09 42 11.06 -26 24 33.7 o 071
2013-01-04 00:35:58 C 09 42 10.39 -26 24 32.2 o 071
2013-01-04 00:39:21 C 09 42 09.53 -26 24 30.3 o 071
2013-01-04 00:42:42 C 09 42 08.73 -26 24 28.7 o 071
2013-01-04 00:46:04 C 09 42 07.80 -26 24 26.5 o 071
2013-01-04 00:49:26 C 09 42 07.09 -26 24 25.3 o 071
2013-01-04 00:52:47 C 09 42 06.08 -26 24 22.9 o 071
2013-01-04 00:56:50 C 09 42 05.12 -26 24 20.9 o 071
2013-01-04 01:00:19 C 09 42 04.18 -26 24 18.4 o 071
2013-01-04 01:07:09 C 09 42 02.34 -26 24 14.8 o 071
2013-01-04 01:10:32 C 09 42 01.58 -26 24 13.2 o 071
2013-01-04 01:14:01 C 09 42 00.66 -26 24 10.7 o 071
2013-01-04 01:17:24 C 09 41 59.79 -26 24 08.6 o 071
2013-01-04 01:20:53 C 09 41 58.98 -26 24 06.9 o 071
2013-01-04 01:53:10 C 09 41 51.66 -26 23 48.7 v 470
2013-01-04 01:54:51 C 09 41 51.22 -26 23 47.3 v 470
2013-01-04 01:56:33 C 09 41 50.80 -26 23 46.1 v 470
2013-01-04 17:56:35 C 09 38 05.18 -26 14 07.3 o 300
2013-01-04 17:57:28 C 09 38 04.95 -26 14 06.9 o 300
2013-01-04 17:58:20 C 09 38 04.73 -26 14 06.2 o 300
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)