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
2021-02-15 18:14:50 C 10 47 58.04 -18 02 27.0 N42
2021-02-15 18:16:07 C 10 47 57.81 -18 02 26.1 N42
2021-02-15 18:17:28 C 10 47 57.59 -18 02 25.2 N42
2021-02-15 18:18:44 C 10 47 57.38 -18 02 24.3 N42
2021-02-15 18:20:08 C 10 47 57.12 -18 02 23.5 N42
2021-02-15 18:27:03 C 10 47 55.96 -18 02 18.9 N42
2021-02-15 18:29:40 C 10 47 55.47 -18 02 17.1 N42
2021-02-15 18:30:58 C 10 47 55.26 -18 02 16.0 N42
2021-02-15 18:32:17 C 10 47 55.04 -18 02 15.2 N42
2021-02-15 18:33:33 C 10 47 54.79 -18 02 14.1 N42
2021-02-15 18:34:51 C 10 47 54.57 -18 02 13.2 N42
2021-02-15 18:36:09 C 10 47 54.36 -18 02 12.3 N42
2021-02-15 18:37:26 C 10 47 54.13 -18 02 11.6 N42
2021-02-15 18:38:44 C 10 47 53.90 -18 02 10.8 N42
2021-02-15 18:40:03 C 10 47 53.67 -18 02 09.7 N42
2021-02-15 18:41:21 C 10 47 53.46 -18 02 08.7 N42
2021-02-15 18:42:39 C 10 47 53.22 -18 02 07.9 N42
2021-02-15 18:43:56 C 10 47 53.01 -18 02 06.9 N42
2021-02-15 18:45:13 C 10 47 52.76 -18 02 05.9 N42
2021-02-15 18:46:31 C 10 47 52.56 -18 02 05.1 N42
2021-02-15 18:47:49 C 10 47 52.32 -18 02 04.2 N42
2021-02-15 18:49:07 C 10 47 52.10 -18 02 03.2 N42
2021-02-15 18:49:39 C 10 47 53.70 -18 01 46.2 V M46
2021-02-15 18:50:24 C 10 47 51.88 -18 02 02.4 N42
2021-02-15 18:51:41 C 10 47 51.66 -18 02 01.4 N42
2021-02-15 18:53:00 C 10 47 51.42 -18 02 00.4 N42
2021-02-15 18:54:17 C 10 47 51.20 -18 01 59.5 N42
2021-02-15 18:54:40 C 10 47 52.78 -18 01 43.2 V M46
2021-02-15 18:55:35 C 10 47 50.97 -18 01 58.6 N42
2021-02-15 18:56:52 C 10 47 50.73 -18 01 57.6 N42
2021-02-15 18:58:09 C 10 47 50.51 -18 01 56.8 N42
2021-02-15 18:59:27 C 10 47 50.31 -18 01 56.1 N42
2021-02-15 18:59:43 C 10 47 51.94 -18 01 39.8 V M46
2021-02-15 19:00:45 C 10 47 50.09 -18 01 55.1 N42
2021-02-15 19:02:02 C 10 47 49.86 -18 01 54.1 N42
2021-02-15 19:03:19 C 10 47 49.63 -18 01 53.1 N42
2021-02-15 19:04:37 C 10 47 49.39 -18 01 52.2 N42
2021-02-15 19:04:47 C 10 47 51.05 -18 01 36.4 V M46
2021-02-15 19:05:55 C 10 47 49.19 -18 01 51.5 N42
2021-02-15 19:07:12 C 10 47 48.95 -18 01 50.3 N42
2021-02-15 19:08:30 C 10 47 48.73 -18 01 49.5 N42
2021-02-15 19:09:47 C 10 47 48.49 -18 01 48.6 N42
2021-02-15 19:09:48 C 10 47 50.15 -18 01 33.0 V M46
2021-02-15 19:11:05 C 10 47 48.27 -18 01 47.6 N42
2021-02-15 19:12:23 C 10 47 48.04 -18 01 46.7 N42
2021-02-15 19:13:40 C 10 47 47.82 -18 01 45.8 N42
2021-02-15 19:14:51 C 10 47 49.28 -18 01 29.5 V M46
2021-02-15 19:14:57 C 10 47 47.59 -18 01 44.9 N42
2021-02-15 19:16:15 C 10 47 47.36 -18 01 43.9 N42
2021-02-15 19:17:32 C 10 47 47.15 -18 01 43.0 N42
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)