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
2021-02-14 19:37:48 C 10 51 30.21 -18 18 03.4 N42
2021-02-14 19:40:05 C 10 51 29.81 -18 18 01.7 N42
2021-02-14 19:42:23 C 10 51 29.42 -18 18 00.4 N42
2021-02-14 19:44:40 C 10 51 29.05 -18 17 59.0 N42
2021-02-14 19:46:57 C 10 51 28.68 -18 17 57.5 N42
2021-02-14 19:49:15 C 10 51 28.29 -18 17 56.1 N42
2021-02-14 19:51:32 C 10 51 27.88 -18 17 54.4 N42
2021-02-14 19:53:49 C 10 51 27.52 -18 17 53.2 N42
2021-02-14 19:56:07 C 10 51 27.11 -18 17 51.5 N42
2021-02-14 19:58:21 C 10 51 27.42 -18 17 47.6 V 186
2021-02-14 19:58:24 C 10 51 26.71 -18 17 50.0 N42
2021-02-14 20:00:42 C 10 51 26.31 -18 17 48.4 N42
2021-02-14 20:02:59 C 10 51 26.00 -18 17 47.3 N42
2021-02-14 20:05:16 C 10 51 25.58 -18 17 45.6 N42
2021-02-14 20:07:34 C 10 51 25.26 -18 17 44.5 N42
2021-02-14 20:09:51 C 10 51 24.77 -18 17 42.5 N42
2021-02-14 20:12:09 C 10 51 24.37 -18 17 41.0 N42
2021-02-14 20:14:27 C 10 51 24.02 -18 17 39.6 N42
2021-02-14 20:16:44 C 10 51 23.61 -18 17 38.1 N42
2021-02-14 20:19:01 C 10 51 23.22 -18 17 36.5 N42
2021-02-14 20:21:19 C 10 51 22.88 -18 17 35.3 N42
2021-02-14 20:23:37 C 10 51 22.43 -18 17 33.5 N42
2021-02-14 20:25:54 C 10 51 22.06 -18 17 31.9 N42
2021-02-14 20:28:12 C 10 51 21.65 -18 17 30.5 N42
2021-02-14 20:30:28 C 10 51 21.31 -18 17 29.3 N42
2021-02-14 20:32:47 C 10 51 20.89 -18 17 27.5 N42
2021-02-14 20:35:04 C 10 51 20.51 -18 17 26.0 N42
2021-02-14 20:37:22 C 10 51 20.12 -18 17 24.5 N42
2021-02-14 20:39:40 C 10 51 19.72 -18 17 23.0 N42
2021-02-14 20:41:57 C 10 51 19.34 -18 17 21.5 N42
2021-02-14 20:44:14 C 10 51 18.94 -18 17 19.8 N42
2021-02-14 20:46:32 C 10 51 18.57 -18 17 18.4 N42
2021-02-14 20:48:49 C 10 51 18.18 -18 17 16.9 N42
2021-02-14 20:51:06 C 10 51 17.79 -18 17 15.3 N42
2021-02-14 20:53:26 C 10 51 17.39 -18 17 13.7 N42
2021-02-14 20:55:42 C 10 51 17.02 -18 17 12.2 N42
2021-02-14 20:57:59 C 10 51 16.56 -18 17 10.5 N42
2021-02-14 21:00:18 C 10 51 16.21 -18 17 09.0 N42
2021-02-14 21:02:34 C 10 51 15.87 -18 17 07.7 N42
2021-02-14 21:04:52 C 10 51 15.53 -18 17 06.5 N42
2021-02-14 21:07:09 C 10 51 15.08 -18 17 04.5 N42
2021-02-14 21:09:27 C 10 51 14.69 -18 17 03.1 N42
2021-02-14 21:11:45 C 10 51 14.29 -18 17 01.4 N42
2021-02-14 21:14:02 C 10 51 13.91 -18 17 00.0 N42
2021-02-14 21:16:19 C 10 51 13.55 -18 16 58.4 N42
2021-02-14 21:18:37 C 10 51 13.11 -18 16 56.7 N42
2021-02-14 21:20:54 C 10 51 12.77 -18 16 55.3 N42
2021-02-14 21:23:11 C 10 51 12.42 -18 16 54.0 N42
2021-02-14 21:25:09 C 10 51 12.55 -18 16 50.6 V 186
2021-02-14 21:25:29 C 10 51 12.04 -18 16 52.5 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)