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
2021-02-24 01:14:05 S 10 15 15.034 -14 20 27.64 V C57
2021-02-24 01:14:05 s 1 +158197.77 2 +141640.40 10.0 C57
2021-02-24 01:54:05 S 10 15 09.866 -14 19 35.40 V C57
2021-02-24 01:54:05 s 1 +158061.10 4 +145031.37 1400.0 C57
2021-02-24 02:16:47 C 10 12 25.43 -14 28 33.9 q Y00
2021-02-24 02:18:11 C 10 12 25.11 -14 28 32.3 q Y00
2021-02-24 02:19:37 C 10 12 24.77 -14 28 31.0 q Y00
2021-02-24 03:21:33 C 10 12 14.41 -14 28 06.3 V W33
2021-02-24 03:29:23 C 10 12 12.78 -14 27 55.5 V W33
2021-02-24 03:37:14 C 10 12 11.16 -14 27 44.7 V W33
2021-02-24 03:45:03 C 10 12 09.54 -14 27 34.0 V W33
2021-02-24 03:52:52 C 10 12 07.91 -14 27 23.2 V W33
2021-02-24 04:01:39 C 10 12 06.08 -14 27 11.1 V W33
2021-02-24 06:24:05 S 10 14 33.710 -14 13 54.84 V C57
2021-02-24 06:24:05 s 1 +156257.34 3 +167072.89 2600.0 C57
2021-02-24 06:54:05 S 10 14 29.777 -14 13 15.85 V C57
2021-02-24 06:54:05 s 1 +155969.79 8 +169432.58 110.0 C57
2021-02-24 07:24:05 S 10 14 25.934 -14 12 36.29 V C57
2021-02-24 07:24:05 s 1 +155666.18 1 +171774.75 5510.0 C57
2021-02-24 07:34:05 S 10 14 24.326 -14 12 25.34 V C57
2021-02-24 07:34:05 s 1 +155561.46 2 +172551.60 290.0 C57
2021-02-24 08:14:05 S 10 14 18.823 -14 11 34.80 V C57
2021-02-24 08:14:05 s 1 +155125.35 0 +175639.71 4910.0 C57
2021-02-24 08:24:05 S 10 14 17.364 -14 11 20.83 V C57
2021-02-24 08:24:05 s 1 +155012.07 3 +176406.93 2560.0 C57
2021-02-24 08:34:05 S 10 14 16.056 -14 11 09.35 V C57
2021-02-24 08:34:05 s 1 +154897.12 0 +177172.24 6850.0 C57
2021-02-24 10:04:05 S 10 14 03.468 -14 09 14.72 V C57
2021-02-24 10:04:05 s 1 +153789.00 4 +183974.46 8160.0 C57
2021-02-24 10:14:05 S 10 14 02.047 -14 09 03.02 V C57
2021-02-24 10:14:05 s 1 +153657.91 3 +184720.82 110.0 C57
2021-02-24 10:24:05 S 10 14 00.571 -14 08 49.70 V C57
2021-02-24 10:24:05 s 1 +153525.26 8 +185465.31 8950.0 C57
2021-02-24 12:34:05 S 10 13 42.053 -14 06 05.18 V C57
2021-02-24 12:34:05 s 1 +151664.17 4 +194974.70 9140.0 C57
2021-02-24 12:44:05 S 10 13 40.560 -14 05 52.08 V C57
2021-02-24 12:44:05 s 1 +151510.84 4 +195693.32 6400.0 C57
2021-02-24 12:54:05 S 10 13 39.192 -14 05 40.42 V C57
2021-02-24 12:54:05 s 1 +151356.10 8 +196410.11 830.0 C57
2021-02-24 13:44:05 S 10 13 31.915 -14 04 37.16 V C57
2021-02-24 13:44:05 s 1 +150561.67 8 +199966.90 1200.0 C57
2021-02-24 13:54:05 S 10 13 30.458 -14 04 24.13 V C57
2021-02-24 13:54:05 s 1 +150398.70 5 +200672.84 9030.0 C57
2021-02-24 14:04:05 S 10 13 29.016 -14 04 10.63 V C57
2021-02-24 14:04:05 s 1 +150234.39 0 +201376.98 4170.0 C57
2021-02-24 14:14:05 S 10 13 27.571 -14 03 58.75 V C57
2021-02-24 14:14:05 s 1 +150068.74 2 +202079.33 6610.0 C57
2021-02-24 14:24:05 S 10 13 26.074 -14 03 46.22 V C57
2021-02-24 14:24:05 s 1 +149901.76 9 +202779.89 6390.0 C57
2021-02-24 14:34:05 S 10 13 24.634 -14 03 33.12 V C57
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)