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
2021-03-06 05:34:05 s 1 -156555.20 8 +15310.533 510.0 C57
2021-03-06 05:39:49 C 09 25 49.14 -07 28 36.0 V U72
2021-03-06 05:44:05 S 09 24 36.413 -07 37 13.40 V C57
2021-03-06 05:44:05 s 1 -156012.48 9 +14375.984 470.0 C57
2021-03-06 05:50:22 C 09 25 46.61 -07 28 11.5 o 691
2021-03-06 05:54:05 S 09 24 34.188 -07 36 50.00 V C57
2021-03-06 05:54:05 s 1 -155464.25 9 +13440.929 9780.0 C57
2021-03-06 06:04:05 S 09 24 32.054 -07 36 27.76 V C57
2021-03-06 06:04:05 s 1 -154910.46 9 +12505.398 8320.0 C57
2021-03-06 06:14:05 S 09 24 29.909 -07 36 04.10 V C57
2021-03-06 06:14:05 s 1 -154351.07 4 +11569.417 6010.0 C57
2021-03-06 06:24:05 S 09 24 27.722 -07 35 42.40 V C57
2021-03-06 06:24:05 s 1 -153786.02 5 +10633.015 2750.0 C57
2021-03-06 06:34:05 S 09 24 25.627 -07 35 19.61 V C57
2021-03-06 06:34:05 s 1 -153215.27 4 + 9696.222 8440.0 C57
2021-03-06 06:44:05 S 09 24 23.412 -07 34 56.17 V C57
2021-03-06 06:44:05 s 1 -152638.77 1 + 8759.068 2990.0 C57
2021-03-06 06:47:38 C 09 25 35.62 -07 26 20.5 V U72
2021-03-06 06:54:05 S 09 24 21.307 -07 34 33.78 V C57
2021-03-06 06:54:05 s 1 -152056.46 9 + 7821.584 6300.0 C57
2021-03-06 07:04:05 S 09 24 19.130 -07 34 10.49 V C57
2021-03-06 07:04:05 s 1 -151468.31 6 + 6883.802 8260.0 C57
2021-03-06 07:14:05 S 09 24 16.994 -07 33 48.20 V C57
2021-03-06 07:14:05 s 1 -150874.26 3 + 5945.754 8780.0 C57
2021-03-06 07:24:05 S 09 24 14.914 -07 33 24.19 V C57
2021-03-06 07:24:05 s 1 -150274.25 8 + 5007.476 7760.0 C57
2021-03-06 07:34:05 S 09 24 12.746 -07 33 02.09 V C57
2021-03-06 07:34:05 s 1 -149668.25 1 + 4069.000 5080.0 C57
2021-03-06 07:44:05 S 09 24 10.670 -07 32 38.69 V C57
2021-03-06 07:44:05 s 1 -149056.19 0 + 3130.362 660.0 C57
2021-03-06 07:44:17 C 09 25 23.61 -07 24 26.0 o 691
2021-03-06 07:54:05 S 09 24 08.544 -07 32 16.04 V C57
2021-03-06 07:54:05 s 1 -148438.02 2 + 2191.599 4370.0 C57
2021-03-06 07:57:09 C 09 25 21.62 -07 24 02.3 V U72
2021-03-06 08:04:05 S 09 24 06.338 -07 31 52.50 V C57
2021-03-06 08:04:05 s 1 -147813.69 5 + 1252.748 6120.0 C57
2021-03-06 08:14:05 S 09 24 04.301 -07 31 29.53 V C57
2021-03-06 08:14:05 s 1 -147183.15 6 + 313.846 5800.0 C57
2021-03-06 08:23:34 C 09 25 15.78 -07 23 07.3 o 691
2021-03-06 08:24:05 S 09 24 02.198 -07 31 07.32 V C57
2021-03-06 08:24:05 s 1 -146546.35 0 - 625.066 3300.0 C57
2021-03-06 08:34:05 S 09 24 00.058 -07 30 43.20 V C57
2021-03-06 08:34:05 s 1 -145903.22 3 - 1563.948 8500.0 C57
2021-03-06 08:44:05 S 09 23 57.936 -07 30 20.95 V C57
2021-03-06 08:44:05 s 1 -145253.72 2 - 2502.759 1310.0 C57
2021-03-06 08:54:05 S 09 23 55.834 -07 29 56.98 V C57
2021-03-06 08:54:05 s 1 -144597.78 9 - 3441.457 1610.0 C57
2021-03-06 09:04:05 S 09 23 53.765 -07 29 34.37 V C57
2021-03-06 09:04:05 s 1 -143935.37 0 - 4379.997 9280.0 C57
2021-03-06 09:04:55 C 09 25 07.62 -07 21 44.5 o 691
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)