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
2012-12-14 00:58:51 C 11 21 40.14 -26 42 19.1 188
2012-12-14 01:00:32 C 11 21 39.83 -26 42 19.5 188
2012-12-14 01:23:27 C 11 21 35.44 -26 42 25.8 188
2012-12-14 01:25:08 C 11 21 35.12 -26 42 26.3 188
2012-12-14 01:26:49 C 11 21 34.81 -26 42 26.7 188
2012-12-14 01:28:31 C 11 21 34.49 -26 42 27.1 188
2012-12-14 01:30:12 C 11 21 34.13 -26 42 27.6 188
2012-12-14 01:31:54 C 11 21 33.83 -26 42 28.1 188
2012-12-14 01:33:35 C 11 21 33.50 -26 42 28.5 188
2012-12-14 01:35:16 C 11 21 33.21 -26 42 28.9 188
2012-12-14 01:36:57 C 11 21 32.87 -26 42 29.3 188
2012-12-14 01:38:39 C 11 21 32.55 -26 42 29.8 188
2012-12-14 01:40:40 C 11 21 32.17 -26 42 30.3 188
2012-12-14 01:42:21 C 11 21 31.83 -26 42 30.8 188
2012-12-14 01:44:02 C 11 21 31.50 -26 42 31.3 188
2012-12-14 01:45:44 C 11 21 31.19 -26 42 31.6 188
2012-12-17 12:11:51 C 11 07 17.45 -27 02 31.3 q H06
2012-12-17 12:15:40 C 11 07 16.71 -27 02 32.2 q H06
2012-12-17 12:19:29 C 11 07 15.99 -27 02 33.1 q H06
2012-12-18 15:24:22 C 11 02 33.08 -27 06 32.3 t E10
2012-12-18 15:25:58 C 11 02 32.80 -27 06 32.7 t E10
2012-12-18 15:27:22 C 11 02 32.52 -27 06 33.2 t E10
2012-12-19 05:30:22 C 10 59 56.17 -27 10 50.6 t 204
2012-12-19 05:35:03 C 10 59 55.24 -27 10 50.6 t 204
2012-12-20 19:34:42 C 10 53 03.35 -27 16 53.3 o 300
2012-12-20 19:37:02 C 10 53 02.86 -27 16 53.9 o 300
2012-12-20 19:39:22 C 10 53 02.37 -27 16 54.2 o 300
2012-12-20 19:41:42 C 10 53 01.89 -27 16 54.4 o 300
2012-12-20 19:44:03 C 10 53 01.40 -27 16 54.9 o 300
2012-12-20 19:46:23 C 10 53 00.94 -27 16 55.1 o 300
2012-12-20 19:48:43 C 10 53 00.44 -27 16 55.6 o 300
2012-12-20 19:51:03 C 10 52 59.97 -27 16 56.0 o 300
2012-12-20 19:53:23 C 10 52 59.49 -27 16 56.4 o 300
2012-12-20 19:55:43 C 10 52 59.00 -27 16 56.7 o 300
2012-12-20 19:58:03 C 10 52 58.53 -27 16 56.8 o 300
2012-12-20 20:00:24 C 10 52 58.03 -27 16 57.4 o 300
2012-12-23 20:01:07 C 10 39 26.62 -27 22 33.6 t D20
2012-12-23 20:01:50 C 10 39 26.48 -27 22 33.5 t D20
2012-12-23 20:02:25 C 10 39 26.34 -27 22 33.7 t D20
2012-12-24 20:00:44 C 10 34 46.53 -27 23 17.1 t D20
2012-12-24 20:01:26 C 10 34 46.37 -27 23 17.0 t D20
2012-12-24 20:02:07 C 10 34 46.22 -27 23 17.1 t D20
2012-12-25 03:35:16 C 10 33 15.06 -27 24 45.3 o 071
2012-12-25 03:37:41 C 10 33 14.47 -27 24 45.2 o 071
2012-12-25 03:40:08 C 10 33 14.01 -27 24 45.0 o 071
2012-12-25 03:42:32 C 10 33 13.46 -27 24 45.0 o 071
2012-12-25 03:45:00 C 10 33 12.90 -27 24 44.8 o 071
2012-12-25 03:47:24 C 10 33 12.55 -27 24 44.8 o 071
2012-12-25 03:49:52 C 10 33 11.84 -27 24 44.7 o 071
2012-12-25 03:57:09 C 10 33 10.28 -27 24 44.4 o 071
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)