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
2013-02-07 14:00:31 C 07 01 20.51 -04 12 30.0 u D20
2013-02-07 14:01:00 C 07 01 21.545 -04 13 33.61 q O44
2013-02-07 14:07:25 C 07 01 20.860 -04 13 22.22 q O44
2013-02-07 14:08:44 C 07 01 20.719 -04 13 19.90 q O44
2013-02-07 14:09:41 C 07 01 20.618 -04 13 18.20 q O44
2013-02-07 14:10:28 C 07 01 20.532 -04 13 16.81 q O44
2013-02-07 14:11:18 C 07 01 20.443 -04 13 15.32 q O44
2013-02-07 14:17:15 C 07 01 19.805 -04 13 04.76 q O44
2013-02-07 14:19:01 C 07 01 19.619 -04 13 01.71 q O44
2013-02-07 14:20:02 C 07 01 19.510 -04 12 59.86 q O44
2013-02-07 14:20:52 C 07 01 19.423 -04 12 58.50 q O44
2013-02-07 14:21:38 C 07 01 19.338 -04 12 56.91 q O44
2013-02-07 14:27:11 C 07 01 18.746 -04 12 47.19 q O44
2013-02-07 14:28:17 C 07 01 18.629 -04 12 45.18 q O44
2013-02-07 14:29:21 C 07 01 18.513 -04 12 43.34 q O44
2013-02-07 14:30:15 C 07 01 18.416 -04 12 41.70 q O44
2013-02-07 14:31:05 C 07 01 18.330 -04 12 40.30 q O44
2013-02-07 14:38:20 C 07 01 17.551 -04 12 27.42 q O44
2013-02-07 14:39:20 C 07 01 17.443 -04 12 25.61 q O44
2013-02-07 14:40:17 C 07 01 17.338 -04 12 23.89 q O44
2013-02-07 14:41:07 C 07 01 17.252 -04 12 22.43 q O44
2013-02-07 14:47:47 C 07 01 16.539 -04 12 10.61 q O44
2013-02-07 14:48:49 C 07 01 16.429 -04 12 08.84 q O44
2013-02-07 14:49:41 C 07 01 16.335 -04 12 07.26 q O44
2013-02-07 14:50:31 C 07 01 16.243 -04 12 05.71 q O44
2013-02-07 14:51:18 C 07 01 16.159 -04 12 04.38 q O44
2013-02-07 14:59:38 C 07 01 14.22 -04 10 44.8 u D20
2013-02-07 15:00:04 C 07 01 14.17 -04 10 44.0 u D20
2013-02-07 15:00:31 C 07 01 14.12 -04 10 43.2 u D20
2013-02-07 15:59:18 C 07 01 07.93 -04 08 58.4 u D20
2013-02-07 15:59:45 C 07 01 07.89 -04 08 57.6 u D20
2013-02-07 16:00:13 C 07 01 07.85 -04 08 56.8 u D20
2013-02-07 17:54:38 C 07 00 56.25 -04 05 32.5 u D20
2013-02-07 17:55:05 C 07 00 56.21 -04 05 31.6 u D20
2013-02-07 17:55:32 C 07 00 56.15 -04 05 30.9 u D20
2013-02-07 18:08:36 C 07 00 59.10 -04 06 30.1 u C40
2013-02-07 18:10:08 C 07 00 58.97 -04 06 27.2 u C40
2013-02-07 18:11:38 C 07 00 58.78 -04 06 24.9 u C40
2013-02-07 18:13:10 C 07 00 58.64 -04 06 21.8 u C40
2013-02-07 18:14:42 C 07 00 58.48 -04 06 19.4 u C40
2013-02-07 18:16:13 C 07 00 58.32 -04 06 16.8 u C40
2013-02-07 18:17:45 C 07 00 58.16 -04 06 13.9 u C40
2013-02-07 18:23:50 C 07 00 57.55 -04 06 03.3 u C40
2013-02-07 18:25:22 C 07 00 57.38 -04 06 00.5 u C40
2013-02-07 18:26:53 C 07 00 57.24 -04 05 57.8 u C40
2013-02-07 18:28:24 C 07 00 57.08 -04 05 55.3 u C40
2013-02-07 18:29:56 C 07 00 56.92 -04 05 52.5 u C40
2013-02-07 18:31:27 C 07 00 56.76 -04 05 49.7 u C40
2013-02-07 18:32:59 C 07 00 56.60 -04 05 47.2 u C40
2013-02-07 18:34:31 C 07 00 56.45 -04 05 44.4 u C40
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)