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
2021-04-01 19:08:24 C 08 12 08.40 +11 24 30.1 V C40
2021-04-01 19:11:28 C 08 12 08.21 +11 24 34.3 V C40
2021-04-01 19:13:02 C 08 12 08.12 +11 24 36.1 V C40
2021-04-01 19:14:33 C 08 12 08.03 +11 24 38.1 V C40
2021-04-01 19:21:46 C 08 12 08.74 +11 24 50.6 V L47
2021-04-01 19:35:49 C 08 12 08.03 +11 25 09.1 V L47
2021-04-01 19:41:18 C 08 12 06.39 +11 25 13.0 V C40
2021-04-01 19:49:01 C 08 12 05.93 +11 25 23.0 V C40
2021-04-01 19:53:37 C 08 12 05.66 +11 25 29.1 V C40
2021-04-01 20:01:20 C 08 12 05.20 +11 25 39.1 V C40
2021-04-01 20:09:03 C 08 12 04.74 +11 25 49.0 V C40
2021-04-01 20:10:35 C 08 12 04.64 +11 25 51.0 V C40
2021-04-01 20:16:46 C 08 12 04.27 +11 25 59.2 V C40
2021-04-01 20:26:57 C 08 12 04.93 +11 26 13.4 V B67
2021-04-01 20:27:33 C 08 12 03.65 +11 26 13.1 V C40
2021-04-01 20:28:17 C 08 12 04.71 +11 26 17.9 q 160
2021-04-01 20:31:32 C 08 12 04.51 +11 26 22.2 q 160
2021-04-01 20:32:09 C 08 12 03.37 +11 26 19.1 V C40
2021-04-01 20:32:26 C 08 12 04.59 +11 26 20.6 V B67
2021-04-01 20:34:46 C 08 12 04.30 +11 26 26.4 q 160
2021-04-01 20:37:56 C 08 12 04.26 +11 26 27.9 V B67
2021-04-01 20:38:19 C 08 12 03.00 +11 26 27.1 V C40
2021-04-01 20:39:57 C 08 12 04.69 +11 26 26.8 V Z80
2021-04-01 20:48:46 C 08 12 04.16 +11 26 38.3 V Z80
2021-04-01 20:49:07 C 08 12 02.39 +11 26 41.4 V C40
2021-04-01 20:57:13 C 08 12 03.60 +11 26 49.6 V Z80
2021-04-01 22:36:02 C 08 11 57.18 +11 29 01.5 V B67
2021-04-01 22:40:07 C 08 11 56.95 +11 29 06.7 V B67
2021-04-01 22:42:10 C 08 11 56.83 +11 29 09.5 V B67
2021-04-01 22:44:12 C 08 11 56.68 +11 29 12.1 V B67
2021-04-01 22:48:17 C 08 11 56.48 +11 29 17.3 V B67
2021-04-01 22:48:17 C 08 11 56.49 +11 29 17.4 V B67
2021-04-02 02:06:58 C 08 11 48.69 +11 33 49.8 V V93
2021-04-02 02:47:23 C 08 11 47.28 +11 34 52.0 o 691
2021-04-02 02:47:29 C 08 11 46.12 +11 34 43.0 V V93
2021-04-02 03:25:51 C 08 11 44.77 +11 35 42.7 o 691
2021-04-02 03:33:43 C 08 11 43.18 +11 35 45.2 V V93
2021-04-02 04:01:46 C 08 11 42.43 +11 36 29.6 o 691
2021-04-02 12:13:58 C 08 11 17.94 +11 47 11.6 q 900
2021-04-02 12:24:04 C 08 11 17.31 +11 47 24.4 q 900
2021-04-02 12:36:56 C 08 11 16.53 +11 47 40.9 q 900
2021-04-02 12:47:08 C 08 11 15.91 +11 47 54.0 q 900
2021-04-02 18:53:38 C 08 11 00.50 +11 55 38.7 V K74
2021-04-02 19:01:15 C 08 11 00.06 +11 55 48.7 V K74
2021-04-02 19:01:15 C 08 11 00.00 +11 55 54.1 q 160
2021-04-02 19:04:21 C 08 10 59.88 +11 55 52.7 V K74
2021-04-02 19:06:27 C 08 10 59.68 +11 56 00.8 q 160
2021-04-02 19:07:03 C 08 10 59.48 +11 56 02.9 q L47
2021-04-02 19:09:07 C 08 10 59.58 +11 55 58.7 V K74
2021-04-02 19:11:39 C 08 10 59.35 +11 56 07.5 q 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)