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
2006-03-25 12:11:11 C 18 19 03.93 -25 16 51.7 o 696
2006-03-25 12:11:46 C 18 19 04.07 -25 16 51.1 o 696
2006-03-25 12:12:25 C 18 19 04.28 -25 16 50.6 o 696
2006-03-25 12:16:05 C 18 19 05.35 -25 16 48.5 o 696
2006-03-25 12:16:43 C 18 19 05.48 -25 16 48.1 o 696
2006-03-26 11:59:46 C 18 26 01.69 -25 00 01.3 o 696
2006-03-26 12:09:30 C 18 26 04.40 -24 59 54.3 o 696
2006-03-26 12:13:03 C 18 26 05.40 -24 59 52.0 o 696
2006-05-01 15:03:24 C 22 43 36.580 -01 20 46.01 L 568
2006-05-01 15:04:38 C 22 43 36.869 -01 20 44.02 L 568
2006-06-01 14:33:48 C 01 12 41.522 +14 14 31.91 L 568
2006-06-01 14:36:30 C 01 12 41.959 +14 14 34.24 L 568
2006-06-02 14:23:04 C 01 16 48.755 +14 34 20.07 L 568
2006-06-02 14:25:07 C 01 16 49.108 +14 34 21.72 L 568
2006-06-02 14:27:13 C 01 16 49.478 +14 34 23.59 L 568
2006-07-27 14:42:03 C 05 06 37.958 +23 53 27.72 L 568
2006-07-27 14:44:50 C 05 06 38.465 +23 53 27.83 L 568
2006-08-15 14:50:40 C 06 26 52.404 +22 57 47.52 L 568
2006-08-15 14:56:09 C 06 26 53.348 +22 57 46.02 L 568
2006-08-16 14:55:26 C 06 31 00.059 +22 51 14.54 L 568
2006-08-16 14:59:09 C 06 31 00.629 +22 51 13.69 L 568
2006-08-16 15:02:48 C 06 31 01.254 +22 51 12.76 L 568
2006-09-04 14:22:47 C 07 45 57.632 +19 48 13.43 L 568
2006-09-04 14:26:30 C 07 45 58.282 +19 48 11.30 L 568
2006-09-04 14:34:07 C 07 45 59.441 +19 48 07.57 L 568
2006-09-04 14:37:49 C 07 46 00.032 +19 48 05.65 L 568
2006-09-04 14:41:32 C 07 46 00.596 +19 48 03.81 L 568
2006-09-04 14:45:14 C 07 46 01.189 +19 48 01.98 L 568
2006-09-04 14:48:57 C 07 46 01.771 +19 48 00.12 L 568
2006-09-04 14:52:40 C 07 46 02.330 +19 47 58.33 L 568
2006-09-04 14:56:32 C 07 46 02.963 +19 47 56.27 L 568
2006-09-04 15:00:14 C 07 46 03.533 +19 47 54.35 L 568
2006-09-04 15:03:57 C 07 46 04.120 +19 47 52.46 L 568
2006-10-25 14:23:54 C 10 38 53.805 +05 37 27.51 L 568
2006-10-25 14:29:18 C 10 38 54.499 +05 37 23.28 L 568
2006-10-25 14:34:42 C 10 38 55.203 +05 37 18.89 L 568
2006-10-25 14:40:18 C 10 38 55.912 +05 37 14.36 L 568
2006-10-25 14:45:41 C 10 38 56.601 +05 37 10.09 L 568
2006-10-25 14:51:04 C 10 38 57.275 +05 37 05.78 L 568
2006-10-25 14:56:39 C 10 38 58.014 +05 37 01.23 L 568
2006-10-25 15:02:01 C 10 38 58.696 +05 36 56.87 L 568
2006-10-25 15:07:24 C 10 38 59.377 +05 36 52.66 L 568
2006-10-25 15:13:00 C 10 39 00.098 +05 36 48.23 L 568
2006-10-25 15:18:25 C 10 39 00.816 +05 36 43.85 L 568
2006-11-28 14:18:08 C 12 23 24.533 -05 33 25.55 L 568
2006-11-28 14:22:43 C 12 23 25.116 -05 33 29.23 L 568
2006-11-28 14:26:49 C 12 23 25.630 -05 33 32.60 L 568
2006-11-28 14:30:23 C 12 23 26.110 -05 33 35.60 L 568
2006-11-28 14:34:00 C 12 23 26.572 -05 33 38.57 L 568
2006-11-28 14:37:24 C 12 23 27.008 -05 33 41.28 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)