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
2013-01-22 21:12:14 C 07 56 04.52 -16 23 59.6 u B17
2013-01-22 21:32:52 C 07 56 01.90 -16 23 19.5 u B04
2013-01-22 21:38:01 C 07 55 58.86 -16 23 10.0 u B17
2013-01-22 21:41:02 C 07 55 58.19 -16 23 04.1 u B17
2013-01-22 21:41:30 C 07 56 00.04 -16 23 03.6 u B04
2013-01-22 21:53:16 C 07 55 57.48 -16 22 41.2 u B04
2013-01-22 22:15:49 C 07 55 52.56 -16 21 58.2 u B04
2013-01-22 22:21:49 C 07 55 51.26 -16 21 46.8 u B04
2013-01-23 07:27:25 C 07 53 57.12 -16 03 23.7 o 303
2013-01-23 07:30:25 C 07 53 56.45 -16 03 17.7 o 303
2013-01-23 12:59:40 C 07 52 59.13 -15 51 42.0 u D20
2013-01-23 13:00:07 C 07 52 59.03 -15 51 41.2 u D20
2013-01-23 13:00:33 C 07 52 58.94 -15 51 40.3 u D20
2013-01-23 15:59:55 C 07 52 20.17 -15 45 56.7 u D20
2013-01-23 16:00:21 C 07 52 20.08 -15 45 55.8 u D20
2013-01-23 16:00:48 C 07 52 19.98 -15 45 54.9 u D20
2013-01-23 16:59:38 C 07 52 07.19 -15 43 59.4 u D20
2013-01-23 17:00:05 C 07 52 07.09 -15 43 58.5 u D20
2013-01-23 17:00:31 C 07 52 07.01 -15 43 57.6 u D20
2013-01-23 17:59:24 C 07 51 54.31 -15 42 00.8 u D20
2013-01-23 17:59:52 C 07 51 54.21 -15 42 00.0 u D20
2013-01-23 18:00:17 C 07 51 54.13 -15 41 59.2 u D20
2013-01-23 18:59:36 C 07 51 41.54 -15 40 00.1 u D20
2013-01-23 19:00:02 C 07 51 41.44 -15 39 59.3 u D20
2013-01-23 19:00:29 C 07 51 41.35 -15 39 58.3 u D20
2013-01-23 19:59:38 C 07 51 29.06 -15 37 58.9 u D20
2013-01-23 20:00:04 C 07 51 28.97 -15 37 58.0 u D20
2013-01-23 20:00:29 C 07 51 28.87 -15 37 57.0 u D20
2013-01-24 14:59:34 C 07 47 55.53 -15 00 51.2 u D20
2013-01-24 15:00:00 C 07 47 55.43 -15 00 50.3 u D20
2013-01-24 15:00:27 C 07 47 55.34 -15 00 49.5 u D20
2013-01-24 15:59:35 C 07 47 42.90 -14 58 53.4 u D20
2013-01-24 16:00:02 C 07 47 42.80 -14 58 52.5 u D20
2013-01-24 16:00:27 C 07 47 42.71 -14 58 51.6 u D20
2013-01-24 16:59:36 C 07 47 30.29 -14 56 54.1 u D20
2013-01-24 17:00:02 C 07 47 30.20 -14 56 53.2 u D20
2013-01-24 17:00:29 C 07 47 30.11 -14 56 52.5 u D20
2013-01-24 17:59:22 C 07 47 17.85 -14 54 54.3 u D20
2013-01-24 17:59:49 C 07 47 17.76 -14 54 53.3 u D20
2013-01-24 18:00:16 C 07 47 17.67 -14 54 52.4 u D20
2013-01-24 18:43:10 C 07 47 14.78 -14 55 04.1 u 089
2013-01-24 18:46:00 C 07 47 14.21 -14 54 59.0 u 089
2013-01-24 18:48:51 C 07 47 13.65 -14 54 52.8 u 089
2013-01-24 18:51:42 C 07 47 13.07 -14 54 47.4 u 089
2013-01-24 18:54:33 C 07 47 12.51 -14 54 41.6 u 089
2013-01-24 18:57:24 C 07 47 11.91 -14 54 36.4 u 089
2013-01-24 18:59:31 C 07 47 05.55 -14 52 52.5 u D20
2013-01-24 18:59:57 C 07 47 05.46 -14 52 51.6 u D20
2013-01-24 19:00:15 C 07 47 11.34 -14 54 30.8 u 089
2013-01-24 19:00:23 C 07 47 05.38 -14 52 50.6 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)