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
2021-03-04 14:44:05 S 09 33 39.708 -08 59 25.62 V C57
2021-03-04 14:44:05 s 1 -192748.97 9 +199908.17 5990.0 C57
2021-03-04 14:54:05 S 09 33 37.325 -08 59 05.53 V C57
2021-03-04 14:54:05 s 1 -192828.22 4 +199273.64 3730.0 C57
2021-03-04 15:04:05 S 09 33 34.918 -08 58 46.13 V C57
2021-03-04 15:04:05 s 1 -192906.20 2 +198637.81 9160.0 C57
2021-03-04 15:14:05 S 09 33 32.570 -08 58 26.58 V C57
2021-03-04 15:14:05 s 1 -192982.90 9 +198000.66 2250.0 C57
2021-03-04 15:24:05 S 09 33 30.233 -08 58 05.95 V C57
2021-03-04 15:24:05 s 1 -193058.33 9 +197362.21 3000.0 C57
2021-03-04 15:34:05 S 09 33 27.823 -08 57 46.37 V C57
2021-03-04 15:34:05 s 1 -193132.48 4 +196722.45 1390.0 C57
2021-03-04 15:44:05 S 09 33 25.462 -08 57 27.29 V C57
2021-03-04 15:44:05 s 1 -193205.33 9 +196081.38 7420.0 C57
2021-03-04 15:54:05 S 09 33 23.047 -08 57 07.16 V C57
2021-03-04 15:54:05 s 1 -193276.89 9 +195438.99 1080.0 C57
2021-03-04 16:04:05 S 09 33 20.690 -08 56 46.75 V C57
2021-03-04 16:04:05 s 1 -193347.15 6 +194795.30 2340.0 C57
2021-03-04 16:14:05 S 09 33 18.276 -08 56 26.56 V C57
2021-03-04 16:14:05 s 1 -193416.10 5 +194150.28 1200.0 C57
2021-03-04 16:24:05 S 09 33 15.902 -08 56 07.22 V C57
2021-03-04 16:24:05 s 1 -193483.74 0 +193503.95 7650.0 C57
2021-03-04 16:34:05 S 09 33 13.529 -08 55 47.68 V C57
2021-03-04 16:34:05 s 1 -193550.05 5 +192856.31 1670.0 C57
2021-03-04 16:44:05 S 09 33 11.162 -08 55 26.54 V C57
2021-03-04 16:44:05 s 1 -193615.04 2 +192207.34 3260.0 C57
2021-03-04 16:54:05 S 09 33 08.794 -08 55 06.89 V C57
2021-03-04 16:54:05 s 1 -193678.69 6 +191557.05 2400.0 C57
2021-03-04 17:04:05 S 09 33 06.434 -08 54 47.56 V C57
2021-03-04 17:04:05 s 1 -193741.01 1 +190905.45 9070.0 C57
2021-03-04 17:14:05 S 09 33 04.025 -08 54 28.12 V C57
2021-03-04 17:14:05 s 1 -193801.97 9 +190252.51 3270.0 C57
2021-03-04 17:24:05 S 09 33 01.668 -08 54 07.13 V C57
2021-03-04 17:24:05 s 1 -193861.59 6 +189598.26 4990.0 C57
2021-03-04 17:34:05 S 09 32 59.302 -08 53 47.22 V C57
2021-03-04 17:34:05 s 1 -193919.85 3 +188942.67 4210.0 C57
2021-03-04 17:44:05 S 09 32 56.897 -08 53 27.67 V C57
2021-03-04 17:44:05 s 1 -193976.74 5 +188285.76 910.0 C57
2021-03-04 17:54:05 S 09 32 54.533 -08 53 08.20 V C57
2021-03-04 17:54:05 s 1 -194032.26 4 +187627.53 5090.0 C57
2021-03-04 18:04:05 S 09 32 52.138 -08 52 47.32 V C57
2021-03-04 18:04:05 s 1 -194086.40 5 +186967.96 6740.0 C57
2021-03-04 18:14:05 S 09 32 49.745 -08 52 26.90 V C57
2021-03-04 18:14:05 s 1 -194139.16 1 +186307.06 5830.0 C57
2021-03-04 18:24:05 S 09 32 47.405 -08 52 07.54 V C57
2021-03-04 18:24:05 s 1 -194190.52 5 +185644.82 2370.0 C57
2021-03-04 18:34:05 S 09 32 45.017 -08 51 47.81 V C57
2021-03-04 18:34:05 s 1 -194240.48 9 +184981.26 6320.0 C57
2021-03-04 18:44:05 S 09 32 42.662 -08 51 26.82 V C57
2021-03-04 18:44:05 s 1 -194289.04 8 +184316.35 7690.0 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)