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
2013-01-19 23:16:40 C 08 10 45.41 -18 35 05.9 o 071
2013-01-19 23:17:57 C 08 10 45.11 -18 35 03.5 o 071
2013-01-19 23:19:02 C 08 10 44.86 -18 35 01.7 o 071
2013-01-19 23:20:17 C 08 10 44.54 -18 34 59.3 o 071
2013-01-19 23:21:23 C 08 10 44.31 -18 34 57.3 o 071
2013-01-19 23:26:57 C 08 10 42.98 -18 34 47.3 o 071
2013-01-19 23:28:14 C 08 10 42.72 -18 34 45.3 o 071
2013-01-19 23:30:34 C 08 10 42.11 -18 34 40.5 o 071
2013-01-20 08:05:58 C 08 08 50.22 -18 18 53.3 o 926
2013-01-20 08:26:19 C 08 08 45.34 -18 18 15.4 o 926
2013-01-20 08:46:39 C 08 08 40.49 -18 17 37.5 o 926
2013-01-20 12:55:22 C 08 07 52.49 -18 08 27.2 u D20
2013-01-20 12:55:48 C 08 07 52.38 -18 08 26.5 u D20
2013-01-20 12:56:09 C 08 07 52.30 -18 08 25.9 u D20
2013-01-20 13:58:45 C 08 07 37.80 -18 06 35.2 u D20
2013-01-20 13:59:11 C 08 07 37.70 -18 06 34.4 u D20
2013-01-20 13:59:38 C 08 07 37.59 -18 06 33.6 u D20
2013-01-20 14:56:00 C 08 07 24.33 -18 04 52.6 u D20
2013-01-20 14:56:28 C 08 07 24.22 -18 04 51.6 u D20
2013-01-20 14:56:54 C 08 07 24.12 -18 04 50.8 u D20
2013-01-20 15:59:00 C 08 07 09.40 -18 02 57.9 u D20
2013-01-20 15:59:26 C 08 07 09.28 -18 02 56.9 u D20
2013-01-20 16:59:15 C 08 06 55.07 -18 01 06.5 u D20
2013-01-20 16:59:41 C 08 06 54.98 -18 01 05.8 u D20
2013-01-20 17:00:09 C 08 06 54.87 -18 01 04.9 u D20
2013-01-20 17:59:26 C 08 06 40.85 -17 59 13.5 u D20
2013-01-20 17:59:52 C 08 06 40.75 -17 59 12.7 u D20
2013-01-20 18:00:19 C 08 06 40.64 -17 59 11.9 u D20
2013-01-20 18:59:43 C 08 06 26.76 -17 57 18.8 u D20
2013-01-20 19:00:09 C 08 06 26.67 -17 57 18.0 u D20
2013-01-20 19:00:38 C 08 06 26.56 -17 57 17.1 u D20
2013-01-20 20:06:20 C 08 06 11.48 -17 55 10.5 u D20
2013-01-20 20:06:46 C 08 06 11.38 -17 55 09.7 u D20
2013-01-20 20:07:14 C 08 06 11.28 -17 55 08.7 u D20
2013-01-20 23:54:31 C 08 05 24.40 -17 49 49.1 u C40
2013-01-20 23:55:33 C 08 05 24.18 -17 49 47.0 u C40
2013-01-20 23:57:35 C 08 05 23.72 -17 49 43.0 u C40
2013-01-20 23:58:37 C 08 05 23.48 -17 49 41.1 u C40
2013-01-21 00:34:03 C 08 05 15.53 -17 48 34.3 u C40
2013-01-21 00:35:34 C 08 05 15.19 -17 48 31.2 u C40
2013-01-21 00:40:08 C 08 05 14.16 -17 48 22.7 u C40
2013-01-21 00:43:11 C 08 05 13.47 -17 48 16.7 u C40
2013-01-21 00:46:01 C 08 05 12.83 -17 48 11.3 u C40
2013-01-21 00:47:32 C 08 05 12.50 -17 48 08.4 u C40
2013-01-21 10:35:17 C 08 03 15.32 -17 28 08.3 o E23
2013-01-21 10:40:17 C 08 03 14.17 -17 27 59.1 o E23
2013-01-21 10:45:18 C 08 03 13.07 -17 27 50.1 o E23
2013-01-21 11:08:40 C 08 03 07.78 -17 27 07.7 o E23
2013-01-21 11:13:41 C 08 03 06.67 -17 26 58.8 o E23
2013-01-21 11:18:41 C 08 03 05.51 -17 26 49.5 o E23
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)