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
2021-03-01 10:44:05 s 1 -79400.453 0 +369999.91 9830.0 C57
2021-03-01 10:54:05 S 09 51 14.419 -11 16 43.57 V C57
2021-03-01 10:54:05 s 1 -79745.062 0 +369863.32 1500.0 C57
2021-03-01 11:04:05 S 09 51 12.269 -11 16 26.00 V C57
2021-03-01 11:04:05 s 1 -80089.458 0 +369725.75 2850.0 C57
2021-03-01 11:14:05 S 09 51 10.025 -11 16 09.52 V C57
2021-03-01 11:14:05 s 1 -80433.639 0 +369587.19 3870.0 C57
2021-03-01 11:24:05 S 09 51 07.788 -11 15 53.28 V C57
2021-03-01 11:24:05 s 1 -80777.604 0 +369447.65 4560.0 C57
2021-03-01 11:34:05 S 09 51 05.614 -11 15 37.87 V C57
2021-03-01 11:34:05 s 1 -81121.352 0 +369307.12 4920.0 C57
2021-03-01 11:44:05 S 09 51 03.410 -11 15 21.49 V C57
2021-03-01 11:44:05 s 1 -81464.883 0 +369165.61 4950.0 C57
2021-03-01 11:54:05 S 09 51 01.145 -11 15 03.85 V C57
2021-03-01 11:54:05 s 1 -81808.195 0 +369023.11 4640.0 C57
2021-03-01 12:04:05 S 09 50 58.932 -11 14 46.39 V C57
2021-03-01 12:04:05 s 1 -82151.288 0 +368879.63 4000.0 C57
2021-03-01 12:14:05 S 09 50 56.753 -11 14 30.73 V C57
2021-03-01 12:14:05 s 1 -82494.160 0 +368735.16 3010.0 C57
2021-03-01 12:24:05 S 09 50 54.509 -11 14 14.35 V C57
2021-03-01 12:24:05 s 1 -82836.810 0 +368589.71 1690.0 C57
2021-03-01 12:34:05 S 09 50 52.255 -11 13 58.40 V C57
2021-03-01 12:34:05 s 1 -83179.237 0 +368443.27 20.0 C57
2021-03-01 12:44:05 S 09 50 50.040 -11 13 41.77 V C57
2021-03-01 12:44:05 s 1 -83521.440 0 +368295.85 8010.0 C57
2021-03-01 12:54:05 S 09 50 47.875 -11 13 24.13 V C57
2021-03-01 12:54:05 s 1 -83863.419 0 +368147.44 5660.0 C57
2021-03-01 17:43:03 C 09 46 12.91 -10 52 37.0 N42
2021-03-01 17:44:19 C 09 46 12.62 -10 52 34.7 N42
2021-03-01 17:45:37 C 09 46 12.36 -10 52 32.3 N42
2021-03-01 17:46:54 C 09 46 12.08 -10 52 30.0 N42
2021-03-01 17:48:12 C 09 46 11.79 -10 52 27.7 N42
2021-03-01 17:49:24 C 09 46 11.55 -10 52 25.6 N42
2021-03-01 17:50:36 C 09 46 11.33 -10 52 23.7 N42
2021-03-01 17:51:53 C 09 46 11.05 -10 52 21.3 N42
2021-03-01 17:53:06 C 09 46 10.79 -10 52 19.0 N42
2021-03-01 17:54:17 C 09 46 10.52 -10 52 16.9 N42
2021-03-01 17:55:35 C 09 46 10.27 -10 52 14.7 N42
2021-03-01 17:56:47 C 09 46 10.01 -10 52 12.5 N42
2021-03-01 17:57:59 C 09 46 09.77 -10 52 10.5 N42
2021-03-01 17:59:12 C 09 46 09.55 -10 52 08.5 N42
2021-03-01 18:00:24 C 09 46 09.24 -10 52 05.9 N42
2021-03-01 18:01:36 C 09 46 08.99 -10 52 03.9 N42
2021-03-01 18:02:48 C 09 46 08.76 -10 52 01.8 N42
2021-03-01 18:04:01 C 09 46 08.50 -10 51 59.7 N42
2021-03-01 18:05:13 C 09 46 08.22 -10 51 57.3 N42
2021-03-01 18:06:25 C 09 46 07.98 -10 51 55.2 N42
2021-03-01 18:07:37 C 09 46 07.72 -10 51 53.1 N42
2021-03-01 18:08:50 C 09 46 07.48 -10 51 50.9 N42
2021-03-01 18:10:02 C 09 46 07.25 -10 51 49.1 N42
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)