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
2007-01-21 14:09:00 C 15 32 44.371 -20 42 37.63 L 568
2007-01-21 14:12:25 C 15 32 44.938 -20 42 39.26 L 568
2007-01-21 14:15:47 C 15 32 45.499 -20 42 40.83 L 568
2007-01-21 14:19:10 C 15 32 46.078 -20 42 42.56 L 568
2007-01-21 14:22:43 C 15 32 46.703 -20 42 44.34 L 568
2007-01-21 14:29:30 C 15 32 47.848 -20 42 47.67 L 568
2007-01-21 14:33:04 C 15 32 48.443 -20 42 49.39 L 568
2007-01-21 14:36:27 C 15 32 49.033 -20 42 51.06 L 568
2007-01-21 14:39:59 C 15 32 49.620 -20 42 52.79 L 568
2007-01-21 14:43:25 C 15 32 50.198 -20 42 54.45 L 568
2007-01-21 14:46:59 C 15 32 50.816 -20 42 56.26 L 568
2007-01-21 14:50:21 C 15 32 51.395 -20 42 57.88 L 568
2007-01-21 14:53:44 C 15 32 51.961 -20 42 59.57 L 568
2007-01-21 15:00:32 C 15 32 53.108 -20 43 02.86 L 568
2007-01-21 15:12:44 C 15 32 55.168 -20 43 08.85 L 568
2007-01-21 15:19:31 C 15 32 56.312 -20 43 12.14 L 568
2007-01-21 15:22:54 C 15 32 56.911 -20 43 13.89 L 568
2007-01-21 15:26:17 C 15 32 57.478 -20 43 15.48 L 568
2007-01-21 15:40:14 C 15 32 59.821 -20 43 22.32 L 568
2007-01-21 15:43:54 C 15 33 00.470 -20 43 24.16 L 568
2007-01-21 15:47:18 C 15 33 01.030 -20 43 25.75 L 568
2007-01-21 15:50:41 C 15 33 01.605 -20 43 27.43 L 568
2007-01-21 15:54:05 C 15 33 02.171 -20 43 29.04 L 568
2007-01-21 15:57:41 C 15 33 02.793 -20 43 30.82 L 568
2007-01-21 16:01:03 C 15 33 03.361 -20 43 32.52 L 568
2007-01-21 16:04:27 C 15 33 03.947 -20 43 34.16 L 568
2007-01-22 13:43:52 C 15 36 47.728 -20 53 51.02 L 568
2007-01-22 13:50:13 C 15 36 48.815 -20 53 53.82 L 568
2007-01-22 14:02:03 C 15 36 50.845 -20 53 59.54 L 568
2007-01-22 14:06:05 C 15 36 51.544 -20 54 01.48 L 568
2007-01-22 14:13:01 C 15 36 52.723 -20 54 04.90 L 568
2007-01-22 14:16:25 C 15 36 53.296 -20 54 06.42 L 568
2007-01-22 14:19:47 C 15 36 53.865 -20 54 07.99 L 568
2007-01-22 14:23:21 C 15 36 54.479 -20 54 09.82 L 568
2007-01-22 14:26:43 C 15 36 55.064 -20 54 11.36 L 568
2007-01-22 14:30:05 C 15 36 55.637 -20 54 12.96 L 568
2007-01-22 14:33:38 C 15 36 56.236 -20 54 14.69 L 568
2007-01-22 14:37:10 C 15 36 56.845 -20 54 16.36 L 568
2007-01-22 14:40:45 C 15 36 57.473 -20 54 18.12 L 568
2007-01-22 14:44:07 C 15 36 58.034 -20 54 19.83 L 568
2007-01-22 14:47:30 C 15 36 58.619 -20 54 21.25 L 568
2007-01-22 14:51:03 C 15 36 59.210 -20 54 22.97 L 568
2007-01-22 14:54:25 C 15 36 59.808 -20 54 24.59 L 568
2007-01-22 14:57:47 C 15 37 00.364 -20 54 26.20 L 568
2007-01-22 15:01:20 C 15 37 00.969 -20 54 27.89 L 568
2007-01-22 15:04:42 C 15 37 01.551 -20 54 29.50 L 568
2007-01-22 15:08:59 C 15 37 02.296 -20 54 31.56 L 568
2007-01-22 15:12:23 C 15 37 02.858 -20 54 33.24 L 568
2007-01-22 15:15:58 C 15 37 03.468 -20 54 34.88 L 568
2007-01-22 15:19:22 C 15 37 04.044 -20 54 36.49 L 568
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)