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
2021-02-15 19:18:23 C 10 47 48.65 -18 01 27.0 V M46
2021-02-15 19:18:50 C 10 47 46.91 -18 01 42.0 N42
2021-02-15 19:20:08 C 10 47 46.68 -18 01 41.2 N42
2021-02-15 19:21:25 C 10 47 46.47 -18 01 40.4 N42
2021-02-15 19:22:43 C 10 47 46.22 -18 01 39.3 N42
2021-02-15 19:34:26 C 10 47 45.85 -18 01 15.4 V M44
2021-02-15 19:38:59 C 10 47 44.05 -18 01 24.7 V 186
2021-02-15 19:49:34 C 10 47 43.17 -18 01 04.8 V M44
2021-02-15 20:00:40 C 10 47 40.23 -18 01 09.3 V 186
2021-02-15 20:12:41 C 10 47 39.06 -18 00 47.9 V M44
2021-02-15 20:34:20 C 10 47 37.67 -17 59 34.9 V 221
2021-02-15 20:36:04 C 10 47 37.37 -17 59 33.7 V 221
2021-02-15 20:37:47 C 10 47 37.07 -17 59 32.6 V 221
2021-02-15 20:54:21 C 10 47 34.21 -17 59 21.4 V 221
2021-02-15 20:56:04 C 10 47 33.90 -17 59 20.3 V 221
2021-02-15 20:57:48 C 10 47 33.60 -17 59 19.1 V 221
2021-02-15 20:59:30 C 10 47 29.87 -18 00 26.0 V 186
2021-02-15 21:22:58 C 10 47 29.22 -17 59 02.0 V 221
2021-02-15 21:24:44 C 10 47 28.92 -17 59 00.8 V 221
2021-02-15 21:26:32 C 10 47 28.60 -17 58 59.6 V 221
2021-02-15 21:55:04 C 10 47 23.56 -17 58 39.9 V 221
2021-02-15 21:56:53 C 10 47 23.25 -17 58 38.6 V 221
2021-02-15 21:58:39 C 10 47 22.93 -17 58 37.4 V 221
2021-02-15 22:22:41 C 10 47 18.66 -17 58 20.6 V 221
2021-02-15 22:24:25 C 10 47 18.35 -17 58 19.4 V 221
2021-02-15 22:26:16 C 10 47 18.04 -17 58 18.1 V 221
2021-02-15 23:25:03 C 10 47 04.42 -17 58 35.0 V 186
2021-02-15 23:51:07 C 10 47 02.96 -17 58 20.8 U 470
2021-02-15 23:52:22 C 10 47 02.74 -17 58 20.0 U 470
2021-02-15 23:53:43 C 10 47 02.51 -17 58 19.0 U 470
2021-02-16 11:51:25 C 10 45 05.35 -17 48 54.7 V T05
2021-02-16 11:56:01 C 10 45 04.51 -17 48 51.1 V T05
2021-02-16 12:38:41 C 10 44 56.72 -17 48 16.7 V T05
2021-02-16 12:46:05 C 10 44 55.36 -17 48 10.8 V T05
2021-02-16 14:17:51 C 10 44 43.25 -17 47 11.1 q Q21
2021-02-16 14:22:24 C 10 44 42.44 -17 47 08.3 q Q21
2021-02-16 14:26:56 C 10 44 41.62 -17 47 04.8 q Q21
2021-02-16 14:31:28 C 10 44 40.79 -17 47 01.0 q Q21
2021-02-16 16:19:47 C 10 44 20.52 -17 44 23.2 V Q62
2021-02-16 16:32:45 C 10 44 18.17 -17 44 12.6 V Q62
2021-02-16 16:45:47 C 10 44 15.80 -17 44 01.8 V Q62
2021-02-16 16:58:43 C 10 44 13.46 -17 43 50.8 V Q62
2021-02-16 17:36:11 C 10 44 12.95 -17 44 15.2 V M44
2021-02-16 17:54:19 C 10 44 09.73 -17 44 02.6 V M44
2021-02-16 18:03:23 C 10 44 08.18 -17 43 57.3 V M44
2021-02-16 18:35:33 C 10 44 01.36 -17 43 46.1 V 186
2021-02-16 18:38:38 C 10 44 00.80 -17 43 44.1 V 186
2021-02-16 20:05:19 C 10 43 45.06 -17 42 35.5 V 186
2021-02-16 20:08:25 C 10 43 44.56 -17 42 33.2 V 186
2021-02-16 20:32:15 C 10 43 43.65 -17 41 03.5 V 221
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)