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
2004-12-26 02:31:20 C 00 48 39.42 -29 26 06.9 c 651
2004-12-26 02:37:56 C 00 48 42.25 -29 25 47.4 c 651
2004-12-26 02:38:38 C 00 48 42.62 -29 25 45.3 m 683
2004-12-26 02:38:48 C 00 48 42.25 -29 25 45.0 r 448
2004-12-26 02:38:58 C 00 48 42.20 -29 25 44.8 o H06
2004-12-26 02:39:27 C 00 48 42.91 -29 25 43.0 c 651
2004-12-26 02:41:02 C 00 48 43.61 -29 25 38.1 c 651
2004-12-26 02:41:25 C 00 48 43.84 -29 25 38.1 m 683
2004-12-26 02:44:14 C 00 48 44.99 -29 25 29.3 m 683
2004-12-26 02:46:52 C 00 48 46.15 -29 25 21.2 m 683
2004-12-26 02:48:04 C 00 48 46.29 -29 25 17.4 r 448
2004-12-26 02:49:36 C 00 48 47.38 -29 25 13.2 m 683
2004-12-26 02:50:34 C 00 48 47.24 -29 25 10.4 o H06
2004-12-26 02:50:34 C 00 48 47.75 -29 25 09.9 c 651
2004-12-26 02:52:34 C 00 48 48.61 -29 25 03.7 c 651
2004-12-26 02:53:51 C 00 48 49.17 -29 25 00.4 c 651
2004-12-26 02:55:10 C 00 48 49.74 -29 24 56.2 c 651
2004-12-26 02:56:30 C 00 48 50.30 -29 24 53.2 m 683
2004-12-26 02:57:08 C 00 48 50.59 -29 24 50.4 c 651
2004-12-26 02:57:21 C 00 48 50.31 -29 24 49.8 r 448
2004-12-26 03:02:02 C 00 48 52.84 -29 24 35.6 m 683
2004-12-26 03:05:24 C 00 48 54.19 -29 24 26.3 m 683
2004-12-26 03:06:38 C 00 48 54.32 -29 24 22.3 r 448
2004-12-26 03:08:06 C 00 48 55.36 -29 24 18.4 m 683
2004-12-26 03:09:43 C 00 48 56.05 -29 24 13.2 c 651
2004-12-26 03:10:45 C 00 48 56.44 -29 24 12.2 m 683
2004-12-26 03:11:25 C 00 48 56.81 -29 24 08.0 c 651
2004-12-26 03:12:50 C 00 48 57.40 -29 24 04.0 c 651
2004-12-26 03:13:31 C 00 48 57.77 -29 24 02.9 m 683
2004-12-26 03:15:55 C 00 48 58.39 -29 23 54.4 r 448
2004-12-26 03:16:28 C 00 48 58.99 -29 23 54.2 m 683
2004-12-26 03:19:14 C 00 49 00.21 -29 23 44.6 m 683
2004-12-26 03:22:03 C 00 49 01.42 -29 23 37.2 m 683
2004-12-26 16:13:08 C 00 54 52.45 -28 45 49.9 19.5 c 097
2004-12-26 16:17:26 C 00 54 54.27 -28 45 38.2 18.0 c 097
2004-12-26 16:22:09 C 00 54 56.42 -28 45 23.0 20.5 c 097
2004-12-26 16:23:45 C 00 54 57.02 -28 45 19.1 17.9 c 097
2004-12-26 16:25:22 C 00 54 57.75 -28 45 14.2 18.2 c 097
2004-12-26 16:26:44 C 00 54 58.26 -28 45 10.1 18.2 c 097
2004-12-26 16:27:52 C 00 54 58.67 -28 45 06.4 16.7 c 097
2004-12-26 16:28:58 C 00 54 59.21 -28 45 03.2 18.1 c 097
2004-12-26 16:30:04 C 00 54 59.64 -28 45 00.1 18.0 c 097
2004-12-26 16:31:11 C 00 55 00.14 -28 44 57.1 17.8 c 097
2004-12-26 16:32:19 C 00 55 00.61 -28 44 53.9 18.2 c 097
2004-12-26 16:33:27 C 00 55 01.08 -28 44 49.7 18.1 c 097
2004-12-26 16:34:33 C 00 55 01.54 -28 44 46.9 18.2 c 097
2004-12-26 16:45:08 C 00 55 06.00 -28 44 15.4 18.0 c 097
2004-12-26 16:47:51 C 00 55 07.12 -28 44 07.2 18.0 c 097
2004-12-26 16:48:57 C 00 55 07.59 -28 44 03.8 18.0 c 097
2004-12-26 16:50:05 C 00 55 08.06 -28 44 00.4 17.5 c 097
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)