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
2021-03-10 22:01:23 C 09 06 16.02 -03 42 26.5 V L63
2021-03-10 22:04:03 C 09 06 16.44 -03 42 16.7 V I79
2021-03-10 22:10:26 C 09 06 14.41 -03 42 08.5 V L63
2021-03-10 22:13:20 C 09 06 13.79 -03 42 07.6 Y 557
2021-03-10 22:14:57 C 09 06 14.46 -03 41 54.2 V I79
2021-03-10 23:57:46 C 09 05 56.21 -03 38 24.2 V J37
2021-03-11 00:14:24 C 09 05 53.20 -03 37 49.9 V J37
2021-03-11 00:30:07 C 09 05 50.41 -03 37 18.1 V J37
2021-03-11 00:36:46 C 09 05 49.23 -03 37 04.5 V J37
2021-03-11 00:44:28 C 09 05 47.86 -03 36 48.6 V J37
2021-03-11 00:51:08 C 09 05 46.70 -03 36 35.4 V J37
2021-03-11 00:57:52 C 09 05 45.50 -03 36 21.3 V J37
2021-03-11 01:04:33 C 09 05 44.31 -03 36 07.5 V J37
2021-03-11 01:11:12 C 09 05 43.18 -03 35 54.2 V J37
2021-03-11 01:26:13 C 09 05 40.55 -03 35 23.4 V J37
2021-03-11 01:32:51 C 09 05 39.36 -03 35 10.1 V J37
2021-03-11 01:34:14 C 09 05 39.34 -03 34 57.5 o Z22
2021-03-11 01:39:30 C 09 05 38.20 -03 34 56.1 V J37
2021-03-11 01:49:39 C 09 05 36.58 -03 34 25.8 o Z22
2021-03-11 02:12:44 C 09 05 32.48 -03 33 48.6 V J37
2021-03-11 02:26:02 C 09 05 30.19 -03 33 21.0 V J37
2021-03-11 03:28:08 C 09 05 22.716 -03 29 52.51 V W87
2021-03-11 03:29:01 C 09 05 22.559 -03 29 50.64 V W87
2021-03-11 03:29:55 C 09 05 22.392 -03 29 48.80 V W87
2021-03-11 03:30:49 C 09 05 22.231 -03 29 47.03 V W87
2021-03-11 05:10:27 C 09 05 04.471 -03 26 23.94 V W87
2021-03-11 05:11:21 C 09 05 04.216 -03 26 21.98 V W87
2021-03-11 05:12:14 C 09 05 04.070 -03 26 20.32 V W87
2021-03-11 05:13:08 C 09 05 03.912 -03 26 18.51 V W87
2021-03-11 05:18:42 C 09 05 05.77 -03 27 27.5 V 703
2021-03-11 05:26:22 C 09 05 04.40 -03 27 12.0 V 703
2021-03-11 05:34:03 C 09 05 03.00 -03 26 56.4 V 703
2021-03-11 05:41:44 C 09 05 01.62 -03 26 40.8 V 703
2021-03-11 12:57:37 C 09 03 51.54 -03 12 02.9 q D95
2021-03-11 13:09:08 C 09 03 49.50 -03 11 39.5 q D95
2021-03-11 13:14:23 C 09 03 48.57 -03 11 28.9 q D95
2021-03-11 16:53:10 C 09 03 14.35 -03 04 09.3 Y N42
2021-03-11 16:54:07 C 09 03 14.18 -03 04 07.3 Y N42
2021-03-11 16:55:04 C 09 03 14.00 -03 04 05.4 Y N42
2021-03-11 16:56:02 C 09 03 13.83 -03 04 03.4 Y N42
2021-03-11 16:56:59 C 09 03 13.67 -03 04 01.6 Y N42
2021-03-11 16:57:56 C 09 03 13.51 -03 03 59.7 Y N42
2021-03-11 16:58:54 C 09 03 13.34 -03 03 57.7 Y N42
2021-03-11 16:59:51 C 09 03 13.17 -03 03 55.8 Y N42
2021-03-11 17:00:49 C 09 03 13.00 -03 03 53.8 Y N42
2021-03-11 17:01:46 C 09 03 12.84 -03 03 51.8 Y N42
2021-03-11 17:02:43 C 09 03 12.67 -03 03 49.8 Y N42
2021-03-11 17:03:41 C 09 03 12.49 -03 03 47.9 Y N42
2021-03-11 17:04:38 C 09 03 12.33 -03 03 46.1 Y N42
2021-03-11 17:05:36 C 09 03 12.16 -03 03 44.1 Y 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)