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
2021-03-05 18:42:46 C 09 27 50.44 -07 50 16.1 V C40
2021-03-05 18:42:57 C 09 27 47.92 -07 50 14.1 N42
2021-03-05 18:43:44 C 09 27 47.76 -07 50 12.6 N42
2021-03-05 18:44:17 C 09 27 50.15 -07 50 13.4 V C40
2021-03-05 18:44:32 C 09 27 47.61 -07 50 11.0 N42
2021-03-05 18:45:19 C 09 27 47.45 -07 50 09.5 N42
2021-03-05 18:45:50 C 09 27 49.84 -07 50 10.2 V C40
2021-03-05 18:46:06 C 09 27 47.28 -07 50 07.8 N42
2021-03-05 18:46:54 C 09 27 47.14 -07 50 06.3 N42
2021-03-05 18:47:23 C 09 27 49.52 -07 50 07.3 V C40
2021-03-05 18:47:40 C 09 27 46.97 -07 50 04.8 N42
2021-03-05 18:48:28 C 09 27 46.82 -07 50 03.2 N42
2021-03-05 18:49:15 C 09 27 46.65 -07 50 01.6 N42
2021-03-05 18:50:02 C 09 27 46.47 -07 50 00.2 N42
2021-03-05 18:50:49 C 09 27 46.33 -07 49 58.9 N42
2021-03-05 18:51:37 C 09 27 46.20 -07 49 57.6 N42
2021-03-05 18:52:24 C 09 27 46.04 -07 49 55.6 N42
2021-03-05 18:53:11 C 09 27 45.88 -07 49 53.8 N42
2021-03-05 18:53:59 C 09 27 45.71 -07 49 52.3 N42
2021-03-05 18:54:46 C 09 27 45.56 -07 49 50.8 N42
2021-03-05 18:55:33 C 09 27 45.39 -07 49 49.2 N42
2021-03-05 18:56:20 C 09 27 45.25 -07 49 47.8 N42
2021-03-05 18:56:38 C 09 27 47.68 -07 49 49.4 V C40
2021-03-05 18:57:08 C 09 27 45.09 -07 49 46.1 N42
2021-03-05 18:57:55 C 09 27 44.93 -07 49 44.6 N42
2021-03-05 18:58:42 C 09 27 44.78 -07 49 43.1 N42
2021-03-05 18:59:30 C 09 27 44.62 -07 49 41.5 N42
2021-03-05 18:59:38 C 09 27 48.46 -07 49 46.9 t G12
2021-03-05 19:00:17 C 09 27 44.45 -07 49 39.9 N42
2021-03-05 19:01:04 C 09 27 44.30 -07 49 38.4 N42
2021-03-05 19:01:51 C 09 27 44.14 -07 49 36.7 N42
2021-03-05 19:02:39 C 09 27 43.99 -07 49 35.2 N42
2021-03-05 19:02:48 C 09 27 47.85 -07 49 40.7 t G12
2021-03-05 19:03:25 C 09 27 43.83 -07 49 33.6 N42
2021-03-05 19:04:13 C 09 27 43.67 -07 49 32.1 N42
2021-03-05 19:05:00 C 09 27 43.51 -07 49 30.6 N42
2021-03-05 19:05:16 C 09 27 47.36 -07 49 35.0 t G12
2021-03-05 19:05:47 C 09 27 43.36 -07 49 29.1 N42
2021-03-05 19:06:00 C 09 27 45.80 -07 49 30.9 V C40
2021-03-05 19:07:33 C 09 27 45.48 -07 49 27.9 V C40
2021-03-05 19:09:07 C 09 27 45.18 -07 49 24.8 V C40
2021-03-05 19:12:12 C 09 27 44.56 -07 49 18.9 V C40
2021-03-05 19:14:05 S 09 26 57.374 -08 00 29.77 V C57
2021-03-05 19:14:05 s 1 -181101.18 8 +71491.075 3730.0 C57
2021-03-05 19:15:15 C 09 27 45.41 -07 49 16.5 t G12
2021-03-05 19:15:16 C 09 27 43.94 -07 49 12.8 V C40
2021-03-05 19:16:48 C 09 27 43.63 -07 49 09.9 V C40
2021-03-05 19:18:18 C 09 27 44.83 -07 49 10.3 t G12
2021-03-05 19:22:22 C 09 27 44.04 -07 49 02.4 t G12
2021-03-05 19:27:36 C 09 27 41.48 -07 48 48.9 V C40
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)