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
2020-12-26 11:23:39 C 11 36 28.80 -12 39 28.7 q H47
2020-12-26 11:49:07 C 11 36 29.38 -12 39 44.1 q H47
2020-12-27 13:02:30 C 11 37 15.69 -12 55 18.4 V H06
2020-12-27 13:07:15 C 11 37 15.80 -12 55 21.1 V H06
2020-12-27 13:12:00 C 11 37 15.89 -12 55 23.4 V H06
2020-12-28 17:36:20 C 11 38 07.78 -13 12 51.8 q Q21
2020-12-28 17:51:27 C 11 38 08.10 -13 12 59.6 q Q21
2020-12-28 18:06:34 C 11 38 08.38 -13 13 10.7 q Q21
2020-12-28 18:21:42 C 11 38 08.72 -13 13 19.5 q Q21
2020-12-28 18:36:49 C 11 38 08.92 -13 13 30.1 q Q21
2020-12-28 18:51:55 C 11 38 09.40 -13 13 37.5 q Q21
2020-12-31 03:22:21 C 11 39 41.87 -13 48 05.3 V 204
2020-12-31 03:35:42 C 11 39 42.11 -13 48 13.4 V 204
2020-12-31 03:49:05 C 11 39 42.35 -13 48 21.6 V 204
2021-01-02 11:17:39 C 11 41 02.99 -14 21 34.5 V 291
2021-01-02 11:26:22 C 11 41 03.10 -14 21 39.9 V 291
2021-01-02 11:35:08 C 11 41 03.23 -14 21 45.2 V 291
2021-01-02 13:14:02 C 11 41 04.28 -14 22 44.2 V H06
2021-01-02 13:17:17 C 11 41 04.34 -14 22 46.3 V H06
2021-01-02 13:20:30 C 11 41 04.39 -14 22 48.4 V H06
2021-01-06 13:29:54 C 11 42 55.11 -15 19 00.6 V T08
2021-01-06 13:33:53 C 11 42 55.14 -15 19 03.1 V T08
2021-01-06 13:40:32 C 11 42 55.17 -15 19 07.2 V T08
2021-01-06 14:09:51 C 11 42 55.29 -15 19 24.2 V T08
2021-01-07 15:29:21 C 11 43 15.84 -15 33 53.0 V T05
2021-01-07 15:49:19 C 11 43 15.89 -15 34 04.2 V T05
2021-01-07 15:57:18 C 11 43 15.90 -15 34 08.5 V T05
2021-01-07 16:02:40 C 11 43 15.93 -15 34 11.6 V T05
2021-01-09 09:31:37 C 11 43 45.73 -15 57 33.4 U I41
2021-01-09 11:03:15 C 11 43 45.76 -15 58 25.9 U I41
2021-01-10 12:13:32 C 11 43 56.55 -16 12 16.2 o 291
2021-01-10 12:29:18 C 11 43 56.51 -16 12 24.6 o 291
2021-01-10 12:45:05 C 11 43 56.44 -16 12 33.1 o 291
2021-01-10 15:17:48 C 11 43 57.61 -16 13 50.1 V T08
2021-01-10 15:21:51 C 11 43 57.55 -16 13 52.0 V T08
2021-01-10 15:59:17 C 11 43 57.42 -16 14 11.9 V T08
2021-01-10 16:05:07 C 11 43 57.33 -16 14 15.4 V T08
2021-01-11 03:15:50 C 11 44 02.27 -16 20 31.3 V 204
2021-01-11 03:21:16 C 11 44 02.25 -16 20 34.2 V 204
2021-01-11 03:26:41 C 11 44 02.23 -16 20 37.3 V 204
2021-01-12 09:06:02 C 11 44 09.64 -16 36 20.5 V 703
2021-01-12 09:13:57 C 11 44 09.60 -16 36 24.3 V 703
2021-01-12 09:21:54 C 11 44 09.52 -16 36 27.6 V 703
2021-01-12 09:29:50 C 11 44 09.49 -16 36 32.3 V 703
2021-01-13 02:06:38 C 11 44 10.305 -16 45 16.53 V Z84
2021-01-13 02:33:06 C 11 44 10.073 -16 45 30.92 V Z84
2021-01-13 03:00:42 C 11 44 09.820 -16 45 45.74 V Z84
2021-01-13 03:28:20 C 11 44 09.549 -16 46 00.46 V Z84
2021-01-13 03:55:54 C 11 44 09.265 -16 46 14.97 V Z84
2021-01-13 04:23:29 C 11 44 08.982 -16 46 29.40 V Z84
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)