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
2021-03-19 04:08:41 C 08 38 32.22 +02 46 34.0 V 703
2021-03-19 04:16:48 C 08 38 31.13 +02 46 49.1 V 703
2021-03-19 04:24:56 C 08 38 29.94 +02 47 03.5 V 703
2021-03-19 04:33:04 C 08 38 28.87 +02 47 19.2 V 703
2021-03-19 07:53:17 C 08 38 05.32 +02 53 43.6 V T08
2021-03-19 07:57:56 C 08 38 04.70 +02 53 52.1 V T08
2021-03-19 08:08:33 C 08 38 03.27 +02 54 11.6 V T08
2021-03-19 08:23:25 C 08 38 01.26 +02 54 39.0 V T08
2021-03-19 10:42:07 C 08 37 47.46 +02 58 32.7 q D95
2021-03-19 10:55:45 C 08 37 45.67 +02 58 57.7 q D95
2021-03-19 10:58:54 C 08 37 45.26 +02 59 03.5 q D95
2021-03-19 15:21:23 C 08 37 14.71 +03 06 54.4 V N82
2021-03-19 15:49:18 C 08 37 11.17 +03 07 45.5 V N82
2021-03-19 16:17:12 C 08 37 07.65 +03 08 36.4 V N82
2021-03-19 16:28:22 C 08 37 06.59 +03 09 03.8 Y N42
2021-03-19 16:29:36 C 08 37 06.44 +03 09 06.0 Y N42
2021-03-19 16:30:50 C 08 37 06.27 +03 09 08.2 Y N42
2021-03-19 16:32:05 C 08 37 06.14 +03 09 10.5 Y N42
2021-03-19 16:33:20 C 08 37 05.95 +03 09 13.0 Y N42
2021-03-19 16:34:34 C 08 37 05.80 +03 09 15.1 Y N42
2021-03-19 16:35:49 C 08 37 05.64 +03 09 17.4 Y N42
2021-03-19 16:37:03 C 08 37 05.47 +03 09 19.6 Y N42
2021-03-19 16:38:18 C 08 37 05.34 +03 09 22.2 Y N42
2021-03-19 16:39:32 C 08 37 05.17 +03 09 23.7 Y N42
2021-03-19 16:40:47 C 08 37 05.01 +03 09 26.4 Y N42
2021-03-19 16:45:08 C 08 37 04.14 +03 09 27.6 V N82
2021-03-19 17:13:04 C 08 37 00.64 +03 10 18.4 V N82
2021-03-19 17:40:59 C 08 36 57.18 +03 11 09.3 V N82
2021-03-19 18:08:55 C 08 36 53.75 +03 12 00.4 V N82
2021-03-19 18:36:51 C 08 36 50.34 +03 12 50.8 V N82
2021-03-19 18:40:58 C 08 36 50.67 +03 13 26.3 q M44
2021-03-19 18:56:04 C 08 36 48.63 +03 13 54.2 q M44
2021-03-19 19:12:06 C 08 36 46.57 +03 14 23.2 q M44
2021-03-19 22:35:05 C 08 36 24.81 +03 20 04.5 V Z80
2021-03-19 22:40:05 C 08 36 24.18 +03 20 13.2 V Z80
2021-03-19 22:45:05 C 08 36 23.56 +03 20 22.8 V Z80
2021-03-20 06:03:52 C 08 35 34.50 +03 33 58.2 o 691
2021-03-20 06:05:36 C 08 35 34.28 +03 34 01.3 o 691
2021-03-20 06:07:20 C 08 35 34.06 +03 34 04.4 o 691
2021-03-20 17:58:12 C 08 34 17.91 +03 55 32.7 q M44
2021-03-20 18:11:12 C 08 34 16.34 +03 55 56.4 q M44
2021-03-20 18:29:18 C 08 34 13.97 +03 56 29.3 q M44
2021-03-20 19:56:36 C 08 34 06.38 +03 58 43.5 a 233
2021-03-20 20:01:37 C 08 34 05.77 +03 58 52.4 a 233
2021-03-20 20:07:12 C 08 34 05.10 +03 59 02.2 a 233
2021-03-20 20:12:46 C 08 34 04.42 +03 59 12.3 a 233
2021-03-20 21:14:25 C 08 33 57.81 +04 01 05.6 V J27
2021-03-20 21:17:57 C 08 33 57.38 +04 01 12.0 V J27
2021-03-20 21:21:10 C 08 33 56.98 +04 01 17.5 V J27
2021-03-20 21:39:22 C 08 33 53.94 +04 01 46.4 V L63
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)