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
2013-01-31 07:16:36 C 07 21 22.92 -09 43 15.9 q H45
2013-01-31 07:18:10 C 07 21 22.68 -09 43 12.7 q H45
2013-01-31 07:20:02 C 07 21 22.38 -09 43 09.0 q H45
2013-01-31 07:21:44 C 07 21 22.11 -09 43 05.6 q H45
2013-01-31 07:23:10 C 07 21 21.94 -09 43 02.2 q H45
2013-01-31 07:27:20 C 07 21 21.25 -09 42 54.4 q H45
2013-01-31 17:59:24 C 07 19 52.76 -09 20 49.3 u D20
2013-01-31 17:59:52 C 07 19 52.71 -09 20 48.4 u D20
2013-01-31 18:00:19 C 07 19 52.63 -09 20 47.6 u D20
2013-02-01 07:09:59 C 07 18 06.28 -08 56 22.8 q H45
2013-02-01 07:11:34 C 07 18 06.06 -08 56 19.5 q H45
2013-02-01 07:13:08 C 07 18 05.81 -08 56 17.0 q H45
2013-02-01 07:14:07 C 07 18 05.67 -08 56 14.5 q H45
2013-02-01 07:15:16 C 07 18 05.51 -08 56 12.2 q H45
2013-02-01 07:16:14 C 07 18 05.37 -08 56 10.2 q H45
2013-02-01 07:17:36 C 07 18 05.18 -08 56 07.3 q H45
2013-02-01 07:18:55 C 07 18 04.97 -08 56 05.0 q H45
2013-02-01 12:58:43 C 07 17 24.43 -08 43 43.2 u D20
2013-02-01 12:59:09 C 07 17 24.37 -08 43 42.3 u D20
2013-02-01 12:59:32 C 07 17 24.31 -08 43 41.6 u D20
2013-02-01 14:59:39 C 07 17 06.33 -08 39 48.8 u D20
2013-02-01 15:00:06 C 07 17 06.26 -08 39 48.0 u D20
2013-02-01 15:00:32 C 07 17 06.20 -08 39 47.0 u D20
2013-02-01 15:59:35 C 07 16 57.37 -08 37 51.6 u D20
2013-02-01 16:00:01 C 07 16 57.30 -08 37 50.9 u D20
2013-02-01 16:00:22 C 07 16 57.25 -08 37 50.2 u D20
2013-02-01 16:59:47 C 07 16 48.48 -08 35 53.4 u D20
2013-02-01 17:00:14 C 07 16 48.41 -08 35 52.6 u D20
2013-02-01 17:00:42 C 07 16 48.35 -08 35 51.8 u D20
2013-02-01 17:59:22 C 07 16 39.86 -08 33 55.9 u D20
2013-02-01 17:59:48 C 07 16 39.79 -08 33 55.2 u D20
2013-02-01 18:00:16 C 07 16 39.74 -08 33 54.4 u D20
2013-02-01 21:03:48 C 07 16 20.53 -08 29 22.4 w I57
2013-02-01 22:15:35 C 07 16 07.75 -08 27 07.9 u C40
2013-02-01 22:50:33 C 07 16 02.82 -08 25 59.2 u C40
2013-02-01 22:52:55 C 07 16 04.61 -08 25 51.2 w I57
2013-02-01 23:02:23 C 07 16 01.18 -08 25 35.9 u C40
2013-02-01 23:12:32 C 07 15 59.75 -08 25 15.8 u C40
2013-02-01 23:19:19 C 07 15 58.81 -08 25 02.7 u C40
2013-02-01 23:21:00 C 07 15 58.60 -08 24 59.5 u C40
2013-02-01 23:30:14 C 07 15 57.35 -08 24 41.0 u C40
2013-02-02 00:15:48 C 07 15 52.61 -08 23 09.7 w I57
2013-02-02 12:58:38 C 07 14 19.63 -07 57 13.4 u D20
2013-02-02 12:59:04 C 07 14 19.56 -07 57 12.6 u D20
2013-02-02 12:59:30 C 07 14 19.50 -07 57 11.7 u D20
2013-02-02 13:59:36 C 07 14 10.97 -07 55 16.8 u D20
2013-02-02 14:00:03 C 07 14 10.90 -07 55 15.8 u D20
2013-02-02 14:00:29 C 07 14 10.84 -07 55 15.1 u D20
2013-02-02 14:59:47 C 07 14 02.39 -07 53 21.0 u D20
2013-02-02 15:00:13 C 07 14 02.33 -07 53 20.1 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)