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
2013-01-29 17:00:05 C 07 27 00.08 -10 57 45.7 u D20
2013-01-29 17:00:33 C 07 27 00.01 -10 57 44.8 u D20
2013-01-29 18:59:24 C 07 26 40.21 -10 53 43.8 u D20
2013-01-29 18:59:50 C 07 26 40.15 -10 53 43.1 u D20
2013-01-29 19:00:18 C 07 26 40.07 -10 53 42.0 u D20
2013-01-29 20:22:55 C 07 26 33.14 -10 52 32.5 q B88
2013-01-29 20:38:23 C 07 26 30.54 -10 52 02.4 q B88
2013-01-29 20:53:56 C 07 26 27.98 -10 51 30.9 q B88
2013-01-29 21:22:14 C 07 26 23.70 -10 50 34.6 c A05
2013-01-29 21:25:32 C 07 26 23.15 -10 50 28.0 c A05
2013-01-29 21:33:46 C 07 26 21.78 -10 50 11.9 c A05
2013-01-29 21:35:36 C 07 26 21.48 -10 50 08.1 c A05
2013-01-29 21:38:55 C 07 26 20.93 -10 50 01.7 c A05
2013-01-29 21:42:10 C 07 26 20.38 -10 49 55.2 c A05
2013-01-29 21:45:27 C 07 26 19.83 -10 49 48.8 c A05
2013-01-29 21:48:28 C 07 26 19.33 -10 49 42.8 c A05
2013-01-30 12:58:31 C 07 24 05.38 -10 18 05.0 u D20
2013-01-30 12:58:58 C 07 24 05.30 -10 18 04.2 u D20
2013-01-30 12:59:24 C 07 24 05.23 -10 18 03.3 u D20
2013-01-30 13:58:47 C 07 23 55.48 -10 16 06.9 u D20
2013-01-30 13:59:13 C 07 23 55.42 -10 16 06.1 u D20
2013-01-30 13:59:38 C 07 23 55.34 -10 16 05.2 u D20
2013-01-30 14:59:36 C 07 23 45.43 -10 14 06.9 u D20
2013-01-30 15:00:04 C 07 23 45.37 -10 14 06.0 u D20
2013-01-30 15:00:31 C 07 23 45.29 -10 14 05.2 u D20
2013-01-30 15:59:36 C 07 23 35.54 -10 12 07.7 u D20
2013-01-30 16:00:02 C 07 23 35.47 -10 12 07.0 u D20
2013-01-30 16:00:29 C 07 23 35.40 -10 12 06.0 u D20
2013-01-30 16:59:38 C 07 23 25.74 -10 10 07.8 u D20
2013-01-30 17:00:04 C 07 23 25.67 -10 10 06.8 u D20
2013-01-30 17:00:31 C 07 23 25.60 -10 10 05.9 u D20
2013-01-30 20:36:46 C 07 22 56.45 -10 04 30.1 q B17
2013-01-30 20:40:05 C 07 22 55.92 -10 04 23.2 q B17
2013-01-30 20:43:26 C 07 22 55.38 -10 04 16.8 q B17
2013-01-30 20:46:45 C 07 22 54.84 -10 04 10.1 q B17
2013-01-30 20:50:06 C 07 22 54.32 -10 04 03.6 q B17
2013-01-30 21:27:46 C 07 22 48.31 -10 02 48.8 q B17
2013-01-30 21:31:07 C 07 22 47.79 -10 02 42.2 q B17
2013-01-30 21:34:26 C 07 22 47.24 -10 02 35.4 q B17
2013-01-30 21:37:48 C 07 22 46.68 -10 02 28.8 q B17
2013-01-30 21:41:07 C 07 22 46.18 -10 02 22.2 q B17
2013-01-30 22:16:13 C 07 22 40.62 -10 01 12.3 q B17
2013-01-30 22:22:53 C 07 22 39.54 -10 00 59.1 q B17
2013-01-30 22:29:33 C 07 22 38.52 -10 00 45.2 q B17
2013-01-30 22:59:34 C 07 22 33.79 -09 59 45.4 q B17
2013-01-30 23:06:14 C 07 22 32.78 -09 59 32.2 q B17
2013-01-30 23:09:35 C 07 22 32.24 -09 59 25.8 q B17
2013-01-30 23:12:54 C 07 22 31.74 -09 59 18.9 q B17
2013-01-31 07:13:14 C 07 21 23.42 -09 43 22.7 q H45
2013-01-31 07:15:33 C 07 21 23.07 -09 43 17.9 q H45
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)