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
2021-02-21 03:04:05 S 10 25 17.342 -16 15 11.02 V C57
2021-02-21 03:04:05 s 1 -172316.08 0 +37134.135 8710.0 C57
2021-02-21 03:14:05 S 10 25 15.050 -16 14 58.74 V C57
2021-02-21 03:14:05 s 1 -171890.77 4 +36235.194 5680.0 C57
2021-02-21 03:24:05 S 10 25 12.593 -16 14 42.29 V C57
2021-02-21 03:24:05 s 1 -171461.14 7 +35335.342 4410.0 C57
2021-02-21 03:34:05 S 10 25 10.231 -16 14 26.74 V C57
2021-02-21 03:34:05 s 1 -171027.16 6 +34434.592 4820.0 C57
2021-02-21 03:44:05 S 10 25 07.961 -16 14 11.44 V C57
2021-02-21 03:44:05 s 1 -170588.79 5 +33532.958 6850.0 C57
2021-02-21 03:54:05 S 10 25 05.556 -16 13 56.39 V C57
2021-02-21 03:54:05 s 1 -170146.00 1 +32630.455 440.0 C57
2021-02-21 04:04:05 S 10 25 03.218 -16 13 41.70 V C57
2021-02-21 04:04:05 s 1 -169698.75 0 +31727.097 5510.0 C57
2021-02-21 04:14:05 S 10 25 00.794 -16 13 26.08 V C57
2021-02-21 04:14:05 s 1 -169247.00 7 +30822.898 2000.0 C57
2021-02-21 04:24:05 S 10 24 58.481 -16 13 11.17 V C57
2021-02-21 04:24:05 s 1 -168790.73 5 +29917.875 9840.0 C57
2021-02-21 04:34:05 S 10 24 56.074 -16 12 56.20 V C57
2021-02-21 04:34:05 s 1 -168329.90 0 +29012.042 8960.0 C57
2021-02-21 04:44:05 S 10 24 53.731 -16 12 40.82 V C57
2021-02-21 04:44:05 s 1 -167864.46 6 +28105.417 9290.0 C57
2021-02-21 04:54:05 S 10 24 51.386 -16 12 25.88 V C57
2021-02-21 04:54:05 s 1 -167394.39 6 +27198.016 760.0 C57
2021-02-21 05:04:05 S 10 24 49.025 -16 12 10.84 V C57
2021-02-21 05:04:05 s 1 -166919.65 4 +26289.855 3300.0 C57
2021-02-21 05:14:05 S 10 24 46.649 -16 11 55.43 V C57
2021-02-21 05:14:05 s 1 -166440.20 1 +25380.952 6830.0 C57
2021-02-21 05:24:05 S 10 24 44.299 -16 11 39.98 V C57
2021-02-21 05:24:05 s 1 -165956.00 2 +24471.326 1280.0 C57
2021-02-21 05:34:05 S 10 24 41.923 -16 11 24.68 V C57
2021-02-21 05:34:05 s 1 -165467.01 8 +23560.993 6580.0 C57
2021-02-21 05:44:05 S 10 24 39.588 -16 11 09.17 V C57
2021-02-21 05:44:05 s 1 -164973.21 0 +22649.974 2650.0 C57
2021-02-21 05:54:05 S 10 24 37.243 -16 10 53.76 V C57
2021-02-21 05:54:05 s 1 -164474.54 0 +21738.287 9410.0 C57
2021-02-21 06:04:05 S 10 24 34.877 -16 10 38.60 V C57
2021-02-21 06:04:05 s 1 -163970.96 9 +20825.953 6790.0 C57
2021-02-21 06:14:05 S 10 24 32.496 -16 10 22.98 V C57
2021-02-21 06:14:05 s 1 -163462.45 8 +19912.991 4720.0 C57
2021-02-21 06:24:05 S 10 24 30.163 -16 10 08.08 V C57
2021-02-21 06:24:05 s 1 -162948.96 6 +18999.422 3100.0 C57
2021-02-21 06:34:05 S 10 24 27.790 -16 09 52.09 V C57
2021-02-21 06:34:05 s 1 -162430.45 4 +18085.268 1880.0 C57
2021-02-21 06:44:05 S 10 24 25.450 -16 09 36.58 V C57
2021-02-21 06:44:05 s 1 -161906.88 0 +17170.550 950.0 C57
2021-02-21 06:54:05 S 10 24 23.102 -16 09 21.53 V C57
2021-02-21 06:54:05 s 1 -161378.20 4 +16255.291 260.0 C57
2021-02-21 07:04:05 S 10 24 20.767 -16 09 05.33 V C57
2021-02-21 07:04:05 s 1 -160844.38 4 +15339.514 9700.0 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)