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
2005-01-01 19:50:08 C 01 52 08.45 -21 17 44.4 r 941
2005-01-01 19:52:07 C 01 52 09.07 -21 17 38.2 r 941
2005-01-02 03:13:49 C 01 54 34.35 -20 55 32.0 o H06
2005-01-02 03:17:18 C 01 54 35.43 -20 55 21.6 o H06
2005-01-02 03:21:23 C 01 54 36.64 -20 55 09.1 o H06
2005-01-02 10:38:40 C 01 56 59.80 -20 33 29.8 m 300
2005-01-02 10:41:08 C 01 57 00.54 -20 33 22.3 m 300
2005-01-02 10:43:35 C 01 57 01.26 -20 33 15.1 m 300
2005-01-02 10:46:05 C 01 57 02.03 -20 33 07.7 m 300
2005-01-02 10:48:31 C 01 57 02.79 -20 33 00.4 m 300
2005-01-02 10:58:41 C 01 57 05.83 -20 32 29.5 m 300
2005-01-02 18:08:49 C 01 59 25.52 -20 11 18.7 c 952
2005-01-02 18:13:09 C 01 59 26.81 -20 11 06.3 c 952
2005-01-02 18:17:30 C 01 59 28.11 -20 10 53.2 c 952
2005-01-02 18:21:50 C 01 59 29.39 -20 10 40.9 c 952
2005-01-02 18:26:10 C 01 59 30.67 -20 10 28.0 c 952
2005-01-02 18:48:11 C 01 59 36.30 -20 09 25.6 d 589
2005-01-02 19:13:10 C 01 59 43.72 -20 08 11.1 d 589
2005-01-02 19:15:22 C 01 59 45.50 -20 08 10.4 r J95
2005-01-02 19:26:15 C 01 59 48.78 -20 07 38.6 r J95
2005-01-02 19:37:11 C 01 59 52.06 -20 07 06.0 r J95
2005-01-02 19:38:10 C 01 59 51.25 -20 06 56.9 d 589
2005-01-02 20:03:10 C 01 59 58.79 -20 05 42.6 d 589
2005-01-02 20:28:11 C 02 00 06.25 -20 04 28.0 d 589
2005-01-03 17:26:24 C 02 06 39.12 -19 03 11.2 o 185
2005-01-03 17:30:51 C 02 06 40.12 -19 02 56.2 d 589
2005-01-03 17:31:00 C 02 06 40.42 -19 02 58.2 o 185
2005-01-03 17:36:44 C 02 06 42.11 -19 02 42.3 o 185
2005-01-03 17:43:18 C 02 06 43.96 -19 02 23.1 o 185
2005-01-03 18:02:21 C 02 06 49.17 -19 01 25.8 c 104
2005-01-03 18:04:48 C 02 06 49.93 -19 01 18.7 c 104
2005-01-03 18:07:19 C 02 06 50.65 -19 01 11.5 c 104
2005-01-03 18:15:51 C 02 06 52.91 -19 00 46.1 d 589
2005-01-03 18:19:15 C 02 06 54.14 -19 00 37.7 c 587
2005-01-03 18:21:50 C 02 06 54.89 -19 00 31.7 c 587
2005-01-03 18:24:27 C 02 06 55.65 -19 00 23.7 c 587
2005-01-03 18:35:09 C 02 06 58.86 -18 59 52.3 r A13
2005-01-03 18:41:19 C 02 07 00.64 -18 59 34.4 r A13
2005-01-03 18:47:08 C 02 07 02.29 -18 59 17.5 r A13
2005-01-03 18:52:35 C 02 07 03.85 -18 59 01.8 r A13
2005-01-03 19:05:50 C 02 07 07.15 -18 58 20.9 d 589
2005-01-03 19:20:40 C 02 07 11.87 -18 57 40.1 r A13
2005-01-03 19:26:16 C 02 07 13.46 -18 57 24.0 r A13
2005-01-03 19:27:06 C 02 07 13.35 -18 57 21.0 r A30
2005-01-03 19:31:49 C 02 07 15.05 -18 57 07.7 r A13
2005-01-03 19:32:39 C 02 07 14.95 -18 57 04.7 r A30
2005-01-03 19:41:11 C 02 07 17.45 -18 56 39.4 r A30
2005-01-03 19:43:02 C 02 07 17.98 -18 56 33.7 r A30
2005-01-04 17:52:10 C 02 13 51.77 -17 53 04.7 o 151
2005-01-04 17:53:24 C 02 13 52.15 -17 53 01.4 o 151
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)