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
2021-02-21 07:14:05 S 10 24 18.434 -16 08 50.39 V C57
2021-02-21 07:14:05 s 1 -160305.37 8 +14423.242 9200.0 C57
2021-02-21 07:54:05 S 10 24 09.029 -16 07 46.88 V C57
2021-02-21 07:54:05 s 1 -158096.64 2 +10753.703 6150.0 C57
2021-02-21 08:04:05 S 10 24 06.778 -16 07 31.55 V C57
2021-02-21 08:04:05 s 1 -157531.06 3 + 9835.334 4690.0 C57
2021-02-21 08:14:05 S 10 24 04.145 -16 07 13.08 V C57
2021-02-21 08:14:05 s 1 -156960.03 8 + 8916.625 2790.0 C57
2021-02-21 08:24:05 S 10 24 02.078 -16 06 59.62 V C57
2021-02-21 08:24:05 s 1 -156383.52 2 + 7997.604 340.0 C57
2021-02-21 08:34:05 S 10 23 59.707 -16 06 43.45 V C57
2021-02-21 08:34:05 s 1 -155801.46 9 + 7078.300 7260.0 C57
2021-02-21 08:44:05 S 10 23 57.346 -16 06 27.36 V C57
2021-02-21 08:44:05 s 1 -155213.83 4 + 6158.742 3460.0 C57
2021-02-21 08:54:05 S 10 23 55.044 -16 06 11.27 V C57
2021-02-21 08:54:05 s 1 -154620.57 1 + 5238.961 8860.0 C57
2021-02-21 09:04:05 S 10 23 52.714 -16 05 55.50 V C57
2021-02-21 09:04:05 s 1 -154021.63 2 + 4318.988 3350.0 C57
2021-02-21 09:14:05 S 10 23 50.328 -16 05 39.16 V C57
2021-02-21 09:14:05 s 1 -153416.97 1 + 3398.855 6840.0 C57
2021-02-21 09:24:05 S 10 23 48.010 -16 05 23.64 V C57
2021-02-21 09:24:05 s 1 -152806.54 1 + 2478.594 9250.0 C57
2021-02-21 09:34:05 S 10 23 45.694 -16 05 06.65 V C57
2021-02-21 09:34:05 s 1 -152190.29 2 + 1558.239 480.0 C57
2021-02-21 09:44:05 S 10 23 43.361 -16 04 51.42 V C57
2021-02-21 09:44:05 s 1 -151568.17 8 + 637.823 420.0 C57
2021-02-21 09:54:05 S 10 23 41.057 -16 04 35.29 V C57
2021-02-21 09:54:05 s 1 -150940.14 8 - 282.617 8990.0 C57
2021-02-21 10:04:05 S 10 23 38.678 -16 04 19.02 V C57
2021-02-21 10:04:05 s 1 -150306.15 4 - 1203.045 6090.0 C57
2021-02-21 10:14:05 S 10 23 36.413 -16 04 02.64 V C57
2021-02-21 10:14:05 s 1 -149666.14 6 - 2123.426 1620.0 C57
2021-02-21 10:24:05 S 10 23 34.128 -16 03 46.04 V C57
2021-02-21 10:24:05 s 1 -149020.07 3 - 3043.720 5470.0 C57
2021-02-21 10:34:05 S 10 23 31.752 -16 03 29.92 V C57
2021-02-21 10:34:05 s 1 -148367.88 6 - 3963.889 7560.0 C57
2021-02-21 10:44:05 S 10 23 29.436 -16 03 13.28 V C57
2021-02-21 10:44:05 s 1 -147709.53 2 - 4883.893 7770.0 C57
2021-02-21 10:54:05 S 10 23 27.144 -16 02 57.26 V C57
2021-02-21 10:54:05 s 1 -147044.96 1 - 5803.692 6010.0 C57
2021-02-21 11:04:05 S 10 23 24.866 -16 02 40.78 V C57
2021-02-21 11:04:05 s 1 -146374.12 0 - 6723.243 2180.0 C57
2021-02-21 11:14:05 S 10 23 22.692 -16 02 23.93 V C57
2021-02-21 11:14:05 s 1 -145696.95 6 - 7642.503 6160.0 C57
2021-02-21 13:32:07 C 10 23 50.64 -15 47 24.4 V Q62
2021-02-21 13:33:23 C 10 23 50.39 -15 47 22.8 V Q62
2021-02-21 13:41:00 C 10 23 48.84 -15 47 13.8 V Q62
2021-02-21 13:42:15 C 10 23 48.60 -15 47 12.4 V Q62
2021-02-21 13:43:31 C 10 23 48.33 -15 47 10.8 V Q62
2021-02-21 14:41:33 C 10 23 37.20 -15 47 17.4 q Q21
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)