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
2013-01-25 13:59:34 C 07 43 39.94 -14 15 19.7 u D20
2013-01-25 15:00:10 C 07 43 27.67 -14 13 20.7 u D20
2013-01-25 15:00:36 C 07 43 27.58 -14 13 19.9 u D20
2013-01-25 15:00:57 C 07 43 27.51 -14 13 19.2 u D20
2013-01-25 16:59:51 C 07 43 03.39 -14 09 22.3 u D20
2013-01-25 17:59:28 C 07 42 51.46 -14 07 21.7 u D20
2013-01-25 17:59:54 C 07 42 51.37 -14 07 20.8 u D20
2013-01-25 18:00:20 C 07 42 51.27 -14 07 20.0 u D20
2013-01-25 18:59:07 C 07 42 39.71 -14 05 20.2 u D20
2013-01-25 18:59:35 C 07 42 39.62 -14 05 19.4 u D20
2013-01-25 19:00:02 C 07 42 39.52 -14 05 18.7 u D20
2013-01-25 19:51:23 C 07 42 29.65 -14 03 32.9 u D20
2013-01-25 19:51:49 C 07 42 29.57 -14 03 32.5 u D20
2013-01-26 05:14:04 C 07 40 52.93 -13 46 31.9 u H21
2013-01-26 05:17:58 C 07 40 52.16 -13 46 24.1 u H21
2013-01-26 05:21:42 C 07 40 51.43 -13 46 16.6 u H21
2013-01-26 05:25:26 C 07 40 50.69 -13 46 09.2 u H21
2013-01-26 05:29:10 C 07 40 49.96 -13 46 01.7 u H21
2013-01-26 05:33:22 C 07 40 49.13 -13 45 53.3 u H21
2013-01-26 05:38:05 C 07 40 48.20 -13 45 43.9 u H21
2013-01-26 12:58:21 C 07 39 33.86 -13 29 33.1 u D20
2013-01-26 12:58:48 C 07 39 33.78 -13 29 32.2 u D20
2013-01-26 12:59:15 C 07 39 33.67 -13 29 31.1 u D20
2013-01-26 13:58:46 C 07 39 22.17 -13 27 34.8 u D20
2013-01-26 13:59:12 C 07 39 22.10 -13 27 33.9 u D20
2013-01-26 13:59:33 C 07 39 22.03 -13 27 33.3 u D20
2013-01-26 14:59:35 C 07 39 10.30 -13 25 34.6 u D20
2013-01-26 15:00:02 C 07 39 10.21 -13 25 33.8 u D20
2013-01-26 15:00:29 C 07 39 10.12 -13 25 33.0 u D20
2013-01-26 15:59:36 C 07 38 58.55 -13 23 34.9 u D20
2013-01-26 16:00:03 C 07 38 58.46 -13 23 34.1 u D20
2013-01-26 16:00:31 C 07 38 58.38 -13 23 33.1 u D20
2013-01-26 16:58:59 C 07 38 47.00 -13 21 35.5 u D20
2013-01-26 16:59:26 C 07 38 46.90 -13 21 34.5 u D20
2013-01-26 16:59:51 C 07 38 46.82 -13 21 33.6 u D20
2013-01-26 17:59:24 C 07 38 35.36 -13 19 32.8 u D20
2013-01-26 17:59:52 C 07 38 35.27 -13 19 31.9 u D20
2013-01-26 18:00:18 C 07 38 35.18 -13 19 30.8 u D20
2013-01-26 18:59:11 C 07 38 24.07 -13 17 30.6 u D20
2013-01-26 18:59:37 C 07 38 23.98 -13 17 29.6 u D20
2013-01-26 19:00:03 C 07 38 23.90 -13 17 28.8 u D20
2013-01-27 04:50:20 C 07 36 46.15 -12 59 24.6 u H21
2013-01-27 04:55:23 C 07 36 45.19 -12 59 14.6 u H21
2013-01-27 05:00:48 C 07 36 44.17 -12 59 03.7 u H21
2013-01-27 05:06:12 C 07 36 43.14 -12 58 53.0 u H21
2013-01-27 05:11:36 C 07 36 42.12 -12 58 42.1 u H21
2013-01-27 05:17:01 C 07 36 41.09 -12 58 31.2 u H21
2013-01-27 05:22:20 C 07 36 40.08 -12 58 20.6 u H21
2013-01-27 05:25:50 C 07 36 39.42 -12 58 13.6 u H21
2013-01-27 13:58:53 C 07 35 14.66 -12 39 38.2 u D20
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)