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
2021-01-28 22:01:13 C 11 34 07.08 -19 16 08.6 V 217
2021-01-28 22:02:21 C 11 34 07.01 -19 16 08.9 V 217
2021-01-28 22:03:27 C 11 34 06.94 -19 16 09.1 V 217
2021-01-28 22:04:35 C 11 34 06.86 -19 16 09.4 V 217
2021-01-28 22:05:42 C 11 34 06.78 -19 16 09.6 V 217
2021-01-28 22:06:48 C 11 34 06.70 -19 16 09.9 V 217
2021-01-28 22:07:56 C 11 34 06.62 -19 16 10.1 V 217
2021-01-28 22:09:02 C 11 34 06.54 -19 16 10.4 V 217
2021-01-28 22:10:11 C 11 34 06.46 -19 16 10.6 V 217
2021-01-28 22:11:17 C 11 34 06.39 -19 16 10.8 V 217
2021-01-28 22:12:25 C 11 34 06.30 -19 16 11.1 V 217
2021-01-28 22:13:31 C 11 34 06.23 -19 16 11.3 V 217
2021-01-28 22:14:38 C 11 34 06.15 -19 16 11.6 V 217
2021-01-28 22:15:46 C 11 34 06.07 -19 16 11.9 V 217
2021-01-28 22:16:52 C 11 34 06.00 -19 16 12.1 V 217
2021-01-28 22:18:00 C 11 34 05.92 -19 16 12.3 V 217
2021-01-28 22:19:06 C 11 34 05.84 -19 16 12.6 V 217
2021-01-28 22:20:15 C 11 34 05.76 -19 16 12.8 V 217
2021-01-28 22:21:21 C 11 34 05.69 -19 16 13.1 V 217
2021-01-28 22:22:28 C 11 34 05.61 -19 16 13.3 V 217
2021-01-29 04:16:58 C 11 33 44.194 -19 17 29.28 V Z84
2021-01-29 05:55:10 C 11 33 37.251 -19 17 47.67 V Z84
2021-01-29 12:13:20 C 11 33 17.34 -19 19 00.2 V T08
2021-01-29 12:16:00 C 11 33 17.14 -19 19 00.9 V T08
2021-01-29 12:20:38 C 11 33 16.75 -19 19 02.1 V T08
2021-01-29 12:27:56 C 11 33 16.20 -19 19 03.6 V T08
2021-01-30 11:12:10 C 11 31 50.69 -19 23 25.7 V T08
2021-01-30 11:14:49 C 11 31 50.47 -19 23 26.1 V T08
2021-01-30 11:20:07 C 11 31 50.06 -19 23 27.3 V T08
2021-01-30 11:27:25 C 11 31 49.48 -19 23 28.8 V T08
2021-02-02 03:06:02 C 11 27 09.36 -19 32 10.5 V 204
2021-02-02 03:11:32 C 11 27 08.86 -19 32 10.8 V 204
2021-02-02 03:17:02 C 11 27 08.34 -19 32 11.5 V 204
2021-02-02 12:20:29 C 11 26 25.86 -19 32 37.8 V T08
2021-02-02 12:24:27 C 11 26 25.45 -19 32 38.5 V T08
2021-02-02 12:25:07 C 11 26 25.40 -19 32 38.2 V T08
2021-02-02 12:33:05 C 11 26 24.61 -19 32 38.9 V T08
2021-02-02 12:37:04 C 11 26 24.24 -19 32 39.4 V T08
2021-02-02 12:40:22 C 11 26 23.90 -19 32 39.2 V T08
2021-02-02 15:04:54 C 11 26 13.05 -19 32 01.8 V Q62
2021-02-02 15:07:22 C 11 26 12.82 -19 32 02.1 V Q62
2021-02-02 15:09:50 C 11 26 12.59 -19 32 02.1 V Q62
2021-02-02 22:52:56 C 11 25 34.70 -19 33 23.3 V L34
2021-02-03 00:00:32 C 11 25 28.23 -19 33 29.9 V L34
2021-02-03 00:54:00 C 11 25 22.99 -19 33 33.0 V L34
2021-02-04 16:06:50 C 11 21 52.64 -19 33 59.9 q Q21
2021-02-04 16:11:21 C 11 21 52.11 -19 34 00.4 q Q21
2021-02-04 16:15:55 C 11 21 51.60 -19 34 00.7 q Q21
2021-02-04 16:20:27 C 11 21 51.18 -19 33 59.0 q Q21
2021-02-04 22:02:05 C 11 21 17.95 -19 33 52.3 V 186
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)