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
2021-03-03 16:00:06 C 09 37 19.450 -09 27 36.35 V O85
2021-03-03 16:04:05 S 09 39 02.230 -09 43 07.25 V C57
2021-03-03 16:04:05 s 1 -172238.92 4 +274602.55 7080.0 C57
2021-03-03 16:14:05 S 09 38 59.856 -09 42 47.52 V C57
2021-03-03 16:14:05 s 1 -172448.13 3 +274133.66 9450.0 C57
2021-03-03 16:24:05 S 09 38 57.499 -09 42 28.76 V C57
2021-03-03 16:24:05 s 1 -172656.62 2 +273663.62 540.0 C57
2021-03-03 16:34:05 S 09 38 55.126 -09 42 10.55 V C57
2021-03-03 16:34:05 s 1 -172864.38 9 +273192.45 350.0 C57
2021-03-03 16:44:05 S 09 38 52.778 -09 41 52.62 V C57
2021-03-03 16:44:05 s 1 -173071.43 1 +272720.13 8880.0 C57
2021-03-03 16:54:05 S 09 38 50.448 -09 41 33.32 V C57
2021-03-03 16:54:05 s 1 -173277.74 6 +272246.66 6120.0 C57
2021-03-03 17:04:05 S 09 38 48.091 -09 41 13.81 V C57
2021-03-03 17:04:05 s 1 -173483.33 0 +271772.05 2070.0 C57
2021-03-03 17:05:06 C 09 37 10.31 -09 25 40.6 V C40
2021-03-03 17:06:38 C 09 37 10.01 -09 25 37.7 V C40
2021-03-03 17:09:42 C 09 37 09.39 -09 25 32.0 V C40
2021-03-03 17:11:16 C 09 37 09.07 -09 25 28.9 V C40
2021-03-03 17:12:47 C 09 37 08.77 -09 25 26.3 V C40
2021-03-03 17:14:05 S 09 38 45.744 -09 40 54.84 V C57
2021-03-03 17:14:05 s 1 -173688.18 1 +271296.29 6710.0 C57
2021-03-03 17:18:57 C 09 37 07.52 -09 25 14.6 V C40
2021-03-03 17:20:30 C 09 37 07.20 -09 25 11.8 V C40
2021-03-03 17:22:03 C 09 37 06.90 -09 25 09.0 V C40
2021-03-03 17:23:35 C 09 37 06.59 -09 25 06.1 V C40
2021-03-03 17:24:05 S 09 38 43.351 -09 40 37.02 V C57
2021-03-03 17:24:05 s 1 -173892.29 6 +270819.39 50.0 C57
2021-03-03 17:25:08 C 09 37 06.27 -09 25 03.4 V C40
2021-03-03 17:26:40 C 09 37 05.96 -09 25 00.5 V C40
2021-03-03 17:30:40 C 09 37 05.16 -09 24 53.2 V C40
2021-03-03 17:32:13 C 09 37 04.84 -09 24 50.1 V C40
2021-03-03 17:33:44 C 09 37 04.54 -09 24 47.4 V C40
2021-03-03 17:34:05 S 09 38 40.982 -09 40 18.30 V C57
2021-03-03 17:34:05 s 1 -174095.67 2 +270341.34 2070.0 C57
2021-03-03 17:35:18 C 09 37 04.22 -09 24 44.3 V C40
2021-03-03 17:36:49 C 09 37 03.91 -09 24 41.5 V C40
2021-03-03 17:38:23 C 09 37 03.58 -09 24 38.7 V C40
2021-03-03 17:39:54 C 09 37 03.27 -09 24 35.9 V C40
2021-03-03 17:41:28 C 09 37 02.96 -09 24 32.9 V C40
2021-03-03 17:42:59 C 09 37 02.65 -09 24 30.1 V C40
2021-03-03 17:44:05 S 09 38 38.616 -09 39 58.75 V C57
2021-03-03 17:44:05 s 1 -174298.30 7 +269862.14 2780.0 C57
2021-03-03 17:44:32 C 09 37 02.34 -09 24 27.2 V C40
2021-03-03 17:46:05 C 09 37 02.03 -09 24 24.4 V C40
2021-03-03 17:47:37 C 09 37 01.71 -09 24 21.6 V C40
2021-03-03 17:49:10 C 09 37 01.41 -09 24 18.7 V C40
2021-03-03 17:50:42 C 09 37 01.08 -09 24 15.8 V C40
2021-03-03 17:53:47 C 09 37 00.45 -09 24 10.0 V C40
2021-03-03 17:54:05 S 09 38 36.247 -09 39 40.18 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)