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
2021-03-28 19:51:16 C 08 17 40.48 +09 11 10.9 V C40
2021-03-28 19:53:12 C 08 17 41.68 +09 11 16.6 V G17
2021-03-29 01:53:51 C 08 17 18.67 +09 20 08.7 V V93
2021-03-29 02:37:09 C 08 17 15.21 +09 21 11.9 V V93
2021-03-29 03:23:24 C 08 17 11.52 +09 22 18.9 V V93
2021-03-29 09:45:51 C 08 16 48.21 +09 32 55.0 q E23
2021-03-29 10:06:20 C 08 16 46.57 +09 33 24.6 q E23
2021-03-29 10:27:08 C 08 16 44.90 +09 33 54.5 q E23
2021-03-29 19:00:35 C 08 16 13.19 +09 44 46.4 V G34
2021-03-29 19:05:47 C 08 16 12.81 +09 44 53.9 V G34
2021-03-29 19:11:00 C 08 16 12.42 +09 45 01.4 V G34
2021-03-29 19:16:12 C 08 16 12.04 +09 45 08.9 V G34
2021-03-29 19:36:02 C 08 16 10.91 +09 45 35.4 V G33
2021-03-29 19:37:43 C 08 16 10.79 +09 45 37.8 V G33
2021-03-29 19:39:27 C 08 16 10.64 +09 45 40.6 V G33
2021-03-29 19:41:06 C 08 16 10.51 +09 45 42.9 V G33
2021-03-29 19:42:33 C 08 16 10.39 +09 45 45.4 V G33
2021-03-29 20:18:25 C 08 16 07.22 +09 46 46.5 Z L74
2021-03-29 20:45:53 C 08 16 05.54 +09 47 17.7 V K87
2021-03-29 20:49:03 C 08 16 05.33 +09 47 21.8 V K87
2021-03-29 20:54:18 C 08 16 04.92 +09 47 29.8 V K87
2021-03-29 21:12:48 C 08 16 03.16 +09 48 03.4 Z L74
2021-03-29 21:35:14 C 08 16 02.52 +09 48 27.1 V J69
2021-03-29 21:42:34 C 08 16 01.95 +09 48 37.4 V J69
2021-03-29 21:49:54 C 08 16 01.43 +09 48 47.8 V J69
2021-03-29 22:08:19 C 08 15 59.15 +09 49 21.4 Z L74
2021-03-30 06:58:07 C 08 15 26.56 +10 02 03.0 X U76
2021-03-30 07:13:45 C 08 15 25.54 +10 02 23.6 X U76
2021-03-30 07:33:33 C 08 15 24.11 +10 02 52.0 X U76
2021-03-30 08:22:46 C 08 15 22.08 +10 04 18.5 V T05
2021-03-30 08:30:05 C 08 15 21.54 +10 04 28.7 V T05
2021-03-30 08:45:33 C 08 15 20.39 +10 04 50.2 V T05
2021-03-30 08:53:46 C 08 15 19.78 +10 05 01.6 V T05
2021-03-30 18:43:31 C 08 14 47.85 +10 18 30.0 V L47
2021-03-30 19:00:02 C 08 14 46.69 +10 18 53.3 V L47
2021-03-30 19:08:35 C 08 14 46.13 +10 19 05.0 a 233
2021-03-30 19:14:09 C 08 14 45.75 +10 19 12.8 a 233
2021-03-30 19:19:43 C 08 14 45.35 +10 19 20.6 a 233
2021-03-30 19:20:18 C 08 14 45.59 +10 19 21.1 Z K19
2021-03-30 19:25:19 C 08 14 44.95 +10 19 28.5 a 233
2021-03-30 19:30:21 C 08 14 44.86 +10 19 35.1 Z K19
2021-03-30 19:40:22 C 08 14 44.14 +10 19 48.9 Z K19
2021-03-30 20:43:05 C 08 14 40.15 +10 21 12.6 V Z43
2021-03-30 20:49:19 C 08 14 38.95 +10 21 24.6 V 160
2021-03-30 20:50:14 C 08 14 39.07 +10 21 20.6 V K87
2021-03-30 20:51:56 C 08 14 39.54 +10 21 24.9 V Z43
2021-03-30 20:52:20 C 08 14 38.92 +10 21 23.4 V K87
2021-03-30 20:53:17 C 08 14 38.68 +10 21 29.8 V 160
2021-03-30 20:54:27 C 08 14 38.79 +10 21 26.3 V K87
2021-03-30 20:57:16 C 08 14 38.39 +10 21 35.6 V 160
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)