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
2021-03-02 16:34:05 S 09 44 31.553 -10 25 56.86 V C57
2021-03-02 16:34:05 s 1 -136652.91 2 +329702.27 2980.0 C57
2021-03-02 16:44:05 S 09 44 29.282 -10 25 39.04 V C57
2021-03-02 16:44:05 s 1 -136941.23 0 +329386.07 2840.0 C57
2021-03-02 16:54:05 S 09 44 26.940 -10 25 22.12 V C57
2021-03-02 16:54:05 s 1 -137229.11 5 +329068.84 1970.0 C57
2021-03-02 17:04:05 S 09 44 24.595 -10 25 04.22 V C57
2021-03-02 17:04:05 s 1 -137516.56 7 +328750.56 360.0 C57
2021-03-02 17:14:05 S 09 44 22.310 -10 24 45.25 V C57
2021-03-02 17:14:05 s 1 -137803.58 4 +328431.25 8020.0 C57
2021-03-02 17:24:05 S 09 44 20.028 -10 24 27.32 V C57
2021-03-02 17:24:05 s 1 -138090.16 4 +328110.91 4930.0 C57
2021-03-02 17:34:05 S 09 44 17.731 -10 24 10.19 V C57
2021-03-02 17:34:05 s 1 -138376.30 6 +327789.52 1100.0 C57
2021-03-02 17:44:05 S 09 44 15.398 -10 23 53.38 V C57
2021-03-02 17:44:05 s 1 -138662.00 8 +327467.10 6520.0 C57
2021-03-02 17:54:05 S 09 44 13.058 -10 23 35.52 V C57
2021-03-02 17:54:05 s 1 -138947.26 8 +327143.63 1190.0 C57
2021-03-02 18:04:05 S 09 44 10.750 -10 23 16.01 V C57
2021-03-02 18:04:05 s 1 -139232.08 6 +326819.13 5110.0 C57
2021-03-02 18:14:05 S 09 44 08.460 -10 22 58.51 V C57
2021-03-02 18:14:05 s 1 -139516.45 9 +326493.58 8280.0 C57
2021-03-02 18:24:05 S 09 44 06.166 -10 22 41.63 V C57
2021-03-02 18:24:05 s 1 -139800.38 6 +326167.00 680.0 C57
2021-03-02 18:34:05 S 09 44 03.840 -10 22 24.42 V C57
2021-03-02 18:34:05 s 1 -140083.86 6 +325839.37 2330.0 C57
2021-03-02 18:41:31 C 09 41 26.56 -10 07 21.5 V L54
2021-03-02 18:44:05 S 09 44 01.505 -10 22 06.38 V C57
2021-03-02 18:44:05 s 1 -140366.89 6 +325510.70 3210.0 C57
2021-03-02 18:54:05 S 09 43 59.186 -10 21 47.88 V C57
2021-03-02 18:54:05 s 1 -140649.47 5 +325180.99 3320.0 C57
2021-03-02 19:04:05 S 09 43 56.882 -10 21 29.38 V C57
2021-03-02 19:04:05 s 1 -140931.60 2 +324850.23 2660.0 C57
2021-03-02 19:05:16 C 09 41 21.69 -10 06 38.3 V L54
2021-03-02 19:14:05 S 09 43 54.581 -10 21 12.56 V C57
2021-03-02 19:14:05 s 1 -141213.27 4 +324518.43 1230.0 C57
2021-03-02 19:24:05 S 09 43 52.265 -10 20 55.18 V C57
2021-03-02 19:24:05 s 1 -141494.49 1 +324185.59 9020.0 C57
2021-03-02 19:26:39 C 09 41 17.33 -10 05 59.8 V L54
2021-03-02 19:34:05 S 09 43 49.958 -10 20 37.39 V C57
2021-03-02 19:34:05 s 1 -141775.25 1 +323851.70 6030.0 C57
2021-03-02 19:44:05 S 09 43 47.611 -10 20 19.25 V C57
2021-03-02 19:44:05 s 1 -142055.55 1 +323516.77 2260.0 C57
2021-03-02 19:48:00 C 09 41 12.93 -10 05 20.7 V L54
2021-03-02 19:54:05 S 09 43 45.288 -10 20 00.53 V C57
2021-03-02 19:54:05 s 1 -142335.39 1 +323180.79 7700.0 C57
2021-03-02 20:00:23 C 09 41 11.05 -10 04 59.3 q K40
2021-03-02 20:04:05 S 09 43 42.965 -10 19 42.64 V C57
2021-03-02 20:04:05 s 1 -142614.76 9 +322843.76 2350.0 C57
2021-03-02 20:08:31 C 09 41 09.37 -10 04 44.7 q K40
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)