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
2013-01-27 13:59:19 C 07 35 14.57 -12 39 37.4 u D20
2013-01-27 13:59:45 C 07 35 14.49 -12 39 36.6 u D20
2013-01-27 14:59:39 C 07 35 03.24 -12 37 37.7 u D20
2013-01-27 15:00:06 C 07 35 03.16 -12 37 36.8 u D20
2013-01-27 15:00:31 C 07 35 03.08 -12 37 36.0 u D20
2013-01-27 17:59:03 C 07 34 29.77 -12 31 35.9 u D20
2013-01-27 17:59:29 C 07 34 29.70 -12 31 35.0 u D20
2013-01-27 17:59:57 C 07 34 29.62 -12 31 34.1 u D20
2013-01-27 18:59:36 C 07 34 18.83 -12 29 32.0 u D20
2013-01-27 19:00:03 C 07 34 18.75 -12 29 30.9 u D20
2013-01-27 19:00:29 C 07 34 18.67 -12 29 30.3 u D20
2013-01-27 20:04:32 C 07 34 14.30 -12 29 01.4 q J84
2013-01-27 20:11:41 C 07 34 13.06 -12 28 47.8 q J84
2013-01-27 20:31:04 C 07 34 09.60 -12 28 09.6 q J84
2013-01-27 20:39:54 C 07 34 08.03 -12 27 52.2 q J84
2013-01-27 20:48:42 C 07 34 06.45 -12 27 34.6 q J84
2013-01-27 21:19:11 C 07 34 00.80 -12 26 35.0 q J84
2013-01-28 13:58:37 C 07 31 17.73 -11 51 40.6 u D20
2013-01-28 13:59:06 C 07 31 17.66 -11 51 39.7 u D20
2013-01-28 13:59:32 C 07 31 17.57 -11 51 38.8 u D20
2013-01-28 16:59:33 C 07 30 45.17 -11 45 38.3 u D20
2013-01-28 17:00:00 C 07 30 45.11 -11 45 37.5 u D20
2013-01-28 17:00:28 C 07 30 45.03 -11 45 36.6 u D20
2013-01-28 17:59:23 C 07 30 34.61 -11 43 37.2 u D20
2013-01-28 17:59:51 C 07 30 34.54 -11 43 36.4 u D20
2013-01-28 18:00:18 C 07 30 34.45 -11 43 35.4 u D20
2013-01-28 18:59:29 C 07 30 24.23 -11 41 34.6 u D20
2013-01-28 18:59:55 C 07 30 24.15 -11 41 33.9 u D20
2013-01-28 19:00:22 C 07 30 24.08 -11 41 32.6 u D20
2013-01-28 22:07:39 C 07 29 58.88 -11 36 55.0 A05
2013-01-28 22:09:12 C 07 29 58.62 -11 36 51.8 A05
2013-01-28 22:14:12 C 07 29 57.75 -11 36 42.1 A05
2013-01-28 22:15:16 C 07 29 57.55 -11 36 39.9 A05
2013-01-28 22:16:19 C 07 29 57.36 -11 36 37.8 A05
2013-01-28 22:17:22 C 07 29 57.18 -11 36 35.7 A05
2013-01-28 22:18:25 C 07 29 57.00 -11 36 33.6 A05
2013-01-28 22:19:28 C 07 29 56.82 -11 36 31.6 A05
2013-01-28 22:20:30 C 07 29 56.63 -11 36 29.5 A05
2013-01-28 22:21:33 C 07 29 56.45 -11 36 27.5 A05
2013-01-28 22:22:37 C 07 29 56.26 -11 36 25.2 A05
2013-01-29 13:58:41 C 07 27 31.32 -11 03 47.6 u D20
2013-01-29 13:59:08 C 07 27 31.24 -11 03 46.8 u D20
2013-01-29 13:59:36 C 07 27 31.16 -11 03 46.0 u D20
2013-01-29 14:59:10 C 07 27 20.86 -11 01 47.9 u D20
2013-01-29 14:59:38 C 07 27 20.79 -11 01 47.0 u D20
2013-01-29 15:00:04 C 07 27 20.72 -11 01 46.1 u D20
2013-01-29 15:59:49 C 07 27 10.40 -10 59 46.8 u D20
2013-01-29 16:00:14 C 07 27 10.32 -10 59 45.9 u D20
2013-01-29 16:00:42 C 07 27 10.24 -10 59 45.0 u D20
2013-01-29 16:59:38 C 07 27 00.16 -10 57 46.5 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)