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
2021-01-28 19:59:27 C 11 34 15.50 -19 15 39.4 V 217
2021-01-28 20:00:35 C 11 34 15.43 -19 15 39.8 V 217
2021-01-28 20:01:41 C 11 34 15.36 -19 15 39.9 V 217
2021-01-28 20:02:49 C 11 34 15.28 -19 15 40.2 V 217
2021-01-28 20:03:55 C 11 34 15.20 -19 15 40.6 V 217
2021-01-28 20:05:02 C 11 34 15.12 -19 15 40.8 V 217
2021-01-28 20:06:05 C 11 34 15.06 -19 15 41.1 V 217
2021-01-28 20:07:07 C 11 34 14.99 -19 15 41.3 V 217
2021-01-28 20:08:08 C 11 34 14.92 -19 15 41.7 V 217
2021-01-28 20:09:10 C 11 34 14.86 -19 15 41.9 V 217
2021-01-28 20:10:14 C 11 34 14.75 -19 15 42.1 V 217
2021-01-28 20:11:16 C 11 34 14.69 -19 15 42.4 V 217
2021-01-28 20:16:16 C 11 34 14.36 -19 15 43.6 V 217
2021-01-28 20:17:23 C 11 34 14.28 -19 15 43.9 V 217
2021-01-28 20:18:29 C 11 34 14.21 -19 15 44.2 V 217
2021-01-28 20:19:37 C 11 34 14.13 -19 15 44.5 V 217
2021-01-28 20:20:44 C 11 34 14.05 -19 15 44.7 V 217
2021-01-28 20:21:52 C 11 34 13.98 -19 15 45.0 V 217
2021-01-28 20:22:58 C 11 34 13.90 -19 15 45.3 V 217
2021-01-28 20:24:06 C 11 34 13.82 -19 15 45.5 V 217
2021-01-28 20:25:12 C 11 34 13.75 -19 15 45.9 V 217
2021-01-28 20:26:19 C 11 34 13.67 -19 15 46.2 V 217
2021-01-28 20:27:27 C 11 34 13.59 -19 15 46.5 V 217
2021-01-28 20:28:33 C 11 34 13.53 -19 15 46.8 V 217
2021-01-28 20:29:41 C 11 34 13.44 -19 15 47.0 V 217
2021-01-28 20:30:48 C 11 34 13.36 -19 15 47.3 V 217
2021-01-28 20:31:56 C 11 34 13.29 -19 15 47.5 V 217
2021-01-28 20:33:02 C 11 34 13.20 -19 15 47.8 V 217
2021-01-28 20:34:09 C 11 34 13.13 -19 15 48.2 V 217
2021-01-28 20:35:17 C 11 34 13.05 -19 15 48.4 V 217
2021-01-28 20:36:23 C 11 34 12.98 -19 15 48.6 V 217
2021-01-28 20:37:31 C 11 34 12.90 -19 15 48.9 V 217
2021-01-28 20:38:37 C 11 34 12.83 -19 15 49.2 V 217
2021-01-28 20:39:45 C 11 34 12.73 -19 15 49.5 V 217
2021-01-28 20:40:52 C 11 34 12.67 -19 15 49.7 V 217
2021-01-28 20:42:00 C 11 34 12.60 -19 15 50.0 V 217
2021-01-28 20:43:07 C 11 34 12.51 -19 15 50.4 V 217
2021-01-28 20:44:13 C 11 34 12.43 -19 15 50.6 V 217
2021-01-28 20:47:36 C 11 34 12.21 -19 15 51.4 V 217
2021-01-28 20:48:44 C 11 34 12.13 -19 15 51.6 V 217
2021-01-28 20:49:50 C 11 34 12.05 -19 15 51.9 V 217
2021-01-28 20:50:58 C 11 34 11.97 -19 15 52.3 V 217
2021-01-28 20:52:04 C 11 34 11.89 -19 15 52.6 V 217
2021-01-28 20:53:12 C 11 34 11.82 -19 15 52.7 V 217
2021-01-28 20:54:18 C 11 34 11.74 -19 15 53.1 V 217
2021-01-28 20:55:26 C 11 34 11.67 -19 15 53.2 V 217
2021-01-28 20:56:32 C 11 34 11.58 -19 15 53.6 V 217
2021-01-28 20:57:40 C 11 34 11.51 -19 15 53.8 V 217
2021-01-28 20:58:47 C 11 34 11.43 -19 15 54.1 V 217
2021-01-28 20:59:53 C 11 34 11.36 -19 15 54.4 V 217
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)