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
2021-03-05 03:33:43 C 09 30 39.14 -08 19 44.9 V V93
2021-03-05 04:04:05 S 09 30 29.878 -08 32 29.72 V C57
2021-03-05 04:04:05 s 1 -194530.02 5 +144909.54 9050.0 C57
2021-03-05 04:24:05 S 09 30 25.186 -08 31 49.62 V C57
2021-03-05 04:24:05 s 1 -194438.84 5 +143421.82 2590.0 C57
2021-03-05 04:34:05 S 09 30 22.788 -08 31 28.85 V C57
2021-03-05 04:34:05 s 1 -194390.39 3 +142675.85 4020.0 C57
2021-03-05 04:54:05 S 09 30 18.098 -08 30 47.16 V C57
2021-03-05 04:54:05 s 1 -194287.70 9 +141179.68 6100.0 C57
2021-03-05 05:04:05 S 09 30 15.722 -08 30 27.29 V C57
2021-03-05 05:04:05 s 1 -194233.45 7 +140429.49 6700.0 C57
2021-03-05 05:14:05 S 09 30 13.354 -08 30 06.08 V C57
2021-03-05 05:14:05 s 1 -194177.24 8 +139677.88 3650.0 C57
2021-03-05 05:34:05 S 09 30 08.611 -08 29 24.90 V C57
2021-03-05 05:34:05 s 1 -194058.92 1 +138170.43 6500.0 C57
2021-03-05 05:44:05 S 09 30 06.266 -08 29 04.52 V C57
2021-03-05 05:44:05 s 1 -193996.78 0 +137414.59 2370.0 C57
2021-03-05 05:54:05 S 09 30 03.888 -08 28 42.53 V C57
2021-03-05 05:54:05 s 1 -193932.63 8 +136657.33 4490.0 C57
2021-03-05 06:04:05 S 09 30 01.577 -08 28 22.58 V C57
2021-03-05 06:04:05 s 1 -193866.48 4 +135898.66 2850.0 C57
2021-03-05 06:14:05 S 09 29 59.172 -08 28 02.10 V C57
2021-03-05 06:14:05 s 1 -193798.30 8 +135138.57 7430.0 C57
2021-03-05 06:21:55 C 09 30 06.25 -08 14 10.2 o 691
2021-03-05 06:24:05 S 09 29 56.861 -08 27 41.11 V C57
2021-03-05 06:24:05 s 1 -193728.09 6 +134377.07 8200.0 C57
2021-03-05 06:34:05 S 09 29 54.502 -08 27 20.02 V C57
2021-03-05 06:34:05 s 1 -193655.83 7 +133614.15 5130.0 C57
2021-03-05 06:44:05 S 09 29 52.142 -08 27 00.11 V C57
2021-03-05 06:44:05 s 1 -193581.51 9 +132849.82 8220.0 C57
2021-03-05 06:54:05 S 09 29 49.778 -08 26 38.83 V C57
2021-03-05 06:54:05 s 1 -193505.13 1 +132084.07 7430.0 C57
2021-03-05 07:00:35 C 09 29 58.31 -08 12 54.8 o 691
2021-03-05 07:04:05 S 09 29 47.472 -08 26 17.56 V C57
2021-03-05 07:04:05 s 1 -193426.66 0 +131316.89 2740.0 C57
2021-03-05 07:14:05 S 09 29 45.089 -08 25 57.79 V C57
2021-03-05 07:14:05 s 1 -193346.09 4 +130548.31 4130.0 C57
2021-03-05 07:24:05 S 09 29 42.727 -08 25 37.20 V C57
2021-03-05 07:24:05 s 1 -193263.42 1 +129778.30 1570.0 C57
2021-03-05 07:34:05 S 09 29 40.387 -08 25 15.49 V C57
2021-03-05 07:34:05 s 1 -193178.62 9 +129006.87 5040.0 C57
2021-03-05 07:41:27 C 09 29 49.95 -08 11 34.8 o 691
2021-03-05 07:44:05 S 09 29 38.011 -08 24 54.43 V C57
2021-03-05 07:44:05 s 1 -193091.70 4 +128234.02 4510.0 C57
2021-03-05 07:47:54 C 09 29 48.63 -08 11 22.2 o 691
2021-03-05 07:50:04 C 09 29 48.20 -08 11 17.9 o 691
2021-03-05 07:52:13 C 09 29 47.77 -08 11 13.7 o 691
2021-03-05 07:54:05 S 09 29 35.645 -08 24 33.88 V C57
2021-03-05 07:54:05 s 1 -193002.63 5 +127459.75 9970.0 C57
2021-03-05 08:04:05 S 09 29 33.302 -08 24 13.25 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)