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
2013-01-14 00:41:46 C 08 43 52.32 -22 27 30.9 r A84
2013-01-14 00:44:18 C 08 43 51.64 -22 27 27.1 r A84
2013-01-14 00:45:38 C 08 43 51.31 -22 27 25.1 r A84
2013-01-14 00:46:53 C 08 43 50.98 -22 27 23.1 r A84
2013-01-14 00:48:09 C 08 43 50.64 -22 27 21.6 r A84
2013-01-14 00:49:29 C 08 43 50.29 -22 27 19.5 r A84
2013-01-14 00:50:45 C 08 43 49.95 -22 27 17.6 r A84
2013-01-14 00:52:02 C 08 43 49.63 -22 27 15.8 r A84
2013-01-14 00:53:22 C 08 43 49.25 -22 27 13.8 r A84
2013-01-14 00:54:37 C 08 43 48.94 -22 27 11.9 r A84
2013-01-14 00:56:08 C 08 43 48.55 -22 27 09.9 r A84
2013-01-14 00:57:28 C 08 43 48.19 -22 27 07.6 r A84
2013-01-14 00:58:43 C 08 43 47.87 -22 27 06.0 r A84
2013-01-14 01:00:00 C 08 43 47.53 -22 27 04.2 r A84
2013-01-14 01:01:20 C 08 43 47.18 -22 27 01.9 r A84
2013-01-14 01:02:36 C 08 43 46.84 -22 27 00.1 r A84
2013-01-14 01:03:57 C 08 43 46.49 -22 26 58.4 r A84
2013-01-14 01:05:17 C 08 43 46.16 -22 26 56.5 r A84
2013-01-14 01:06:33 C 08 43 45.79 -22 26 54.5 r A84
2013-01-14 01:09:09 C 08 43 45.14 -22 26 50.8 r A84
2013-01-14 01:10:25 C 08 43 44.78 -22 26 48.6 r A84
2013-01-14 16:59:32 C 08 39 58.55 -22 02 30.2 u D20
2013-01-14 16:59:57 C 08 39 58.42 -22 02 29.6 u D20
2013-01-14 17:00:24 C 08 39 58.31 -22 02 29.0 u D20
2013-01-14 17:06:23 C 08 39 56.73 -22 02 20.2 u D20
2013-01-14 17:06:50 C 08 39 56.61 -22 02 19.7 u D20
2013-01-14 17:07:16 C 08 39 56.50 -22 02 18.9 u D20
2013-01-14 17:39:13 C 08 39 48.03 -22 01 31.9 u D20
2013-01-14 17:39:40 C 08 39 47.90 -22 01 31.2 u D20
2013-01-14 17:40:06 C 08 39 47.79 -22 01 30.7 u D20
2013-01-14 17:53:58 C 08 39 44.12 -22 01 10.0 u D20
2013-01-14 17:54:24 C 08 39 44.02 -22 01 09.2 u D20
2013-01-15 17:50:06 C 08 34 00.20 -21 24 58.3 u D20
2013-01-15 17:50:32 C 08 34 00.08 -21 24 57.6 u D20
2013-01-15 17:50:59 C 08 33 59.96 -21 24 56.9 u D20
2013-01-16 01:24:06 C 08 32 17.95 -21 12 49.7 u I47
2013-01-16 01:24:39 C 08 32 17.81 -21 12 49.2 u I47
2013-01-16 01:25:13 C 08 32 17.68 -21 12 48.2 u I47
2013-01-16 01:25:46 C 08 32 17.54 -21 12 47.4 u I47
2013-01-16 01:26:19 C 08 32 17.40 -21 12 46.7 u I47
2013-01-16 01:26:53 C 08 32 17.27 -21 12 45.6 u I47
2013-01-16 01:27:27 C 08 32 17.13 -21 12 44.8 u I47
2013-01-16 01:28:00 C 08 32 17.00 -21 12 44.1 u I47
2013-01-16 01:28:33 C 08 32 16.86 -21 12 43.6 u I47
2013-01-16 01:29:07 C 08 32 16.72 -21 12 42.5 u I47
2013-01-16 01:29:40 C 08 32 16.57 -21 12 41.8 u I47
2013-01-16 01:30:13 C 08 32 16.44 -21 12 40.9 u I47
2013-01-16 01:30:47 C 08 32 16.31 -21 12 40.0 u I47
2013-01-16 01:31:20 C 08 32 16.16 -21 12 39.1 u I47
2013-01-16 01:31:54 C 08 32 16.02 -21 12 38.4 u I47
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)