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
2021-03-05 19:34:05 S 09 26 52.764 -07 59 47.11 V C57
2021-03-05 19:34:05 s 1 -180547.59 8 +69748.150 4870.0 C57
2021-03-05 19:35:18 C 09 27 39.92 -07 48 33.8 V C40
2021-03-05 19:54:05 S 09 26 48.233 -07 59 03.55 V C57
2021-03-05 19:54:05 s 1 -179980.37 0 +67999.972 40.0 C57
2021-03-05 19:57:39 C 09 27 34.12 -07 47 28.3 V M43
2021-03-05 20:02:49 C 09 27 33.06 -07 47 18.6 V M43
2021-03-05 20:04:05 S 09 26 45.917 -07 58 42.35 V C57
2021-03-05 20:04:05 s 1 -179691.58 0 +67123.925 7760.0 C57
2021-03-05 20:07:58 C 09 27 32.00 -07 47 08.6 V M43
2021-03-05 20:13:07 C 09 27 30.95 -07 46 58.8 V M43
2021-03-05 20:14:05 S 09 26 43.668 -07 58 19.70 V C57
2021-03-05 20:14:05 s 1 -179399.30 6 +66246.580 8840.0 C57
2021-03-05 20:18:16 C 09 27 29.89 -07 46 48.1 V M43
2021-03-05 20:23:26 C 09 27 28.85 -07 46 37.8 V M43
2021-03-05 20:24:05 S 09 26 41.383 -07 57 58.21 V C57
2021-03-05 20:24:05 s 1 -179103.52 1 +65367.943 3220.0 C57
2021-03-05 20:34:05 S 09 26 39.041 -07 57 36.94 V C57
2021-03-05 20:34:05 s 1 -178804.20 1 +64488.020 870.0 C57
2021-03-05 20:44:05 S 09 26 36.814 -07 57 14.00 V C57
2021-03-05 20:44:05 s 1 -178501.31 9 +63606.815 1720.0 C57
2021-03-05 20:54:05 S 09 26 34.481 -07 56 52.73 V C57
2021-03-05 20:54:05 s 1 -178194.84 8 +62724.335 5720.0 C57
2021-03-05 21:04:05 S 09 26 32.172 -07 56 30.66 V C57
2021-03-05 21:04:05 s 1 -177884.76 3 +61840.587 2820.0 C57
2021-03-05 21:14:05 S 09 26 29.945 -07 56 08.34 V C57
2021-03-05 21:14:05 s 1 -177571.03 6 +60955.576 2980.0 C57
2021-03-05 21:24:05 S 09 26 27.658 -07 55 47.28 V C57
2021-03-05 21:24:05 s 1 -177253.64 1 +60069.309 6120.0 C57
2021-03-05 21:26:09 C 09 27 19.98 -07 45 01.2 q K05
2021-03-05 21:32:13 C 09 27 17.23 -07 44 46.6 V 073
2021-03-05 21:34:02 C 09 27 18.42 -07 44 45.8 q K05
2021-03-05 21:34:05 S 09 26 25.394 -07 55 25.82 V C57
2021-03-05 21:34:05 s 1 -176932.54 9 +59181.794 2210.0 C57
2021-03-05 21:37:42 C 09 27 16.17 -07 44 33.5 V 073
2021-03-05 21:41:54 C 09 27 16.86 -07 44 30.6 q K05
2021-03-05 21:43:26 C 09 27 15.03 -07 44 21.9 V 073
2021-03-05 21:44:05 S 09 26 23.136 -07 55 03.29 V C57
2021-03-05 21:44:05 s 1 -176607.73 3 +58293.036 1190.0 C57
2021-03-05 21:49:47 C 09 27 15.30 -07 44 15.0 q K05
2021-03-05 21:52:00 C 09 27 14.52 -07 44 10.2 V G33
2021-03-05 21:53:49 C 09 27 14.15 -07 44 06.7 V G33
2021-03-05 21:54:05 S 09 26 20.863 -07 54 41.98 V C57
2021-03-05 21:54:05 s 1 -176279.16 4 +57403.044 2990.0 C57
2021-03-05 21:55:20 C 09 27 13.86 -07 44 03.7 V G33
2021-03-05 21:57:00 C 09 27 13.52 -07 44 00.3 V G33
2021-03-05 21:57:40 C 09 27 13.74 -07 43 59.6 q K05
2021-03-05 21:58:26 C 09 27 13.23 -07 43 57.7 V G33
2021-03-05 22:00:29 C 09 27 12.83 -07 43 53.6 V G33
2021-03-05 22:03:07 C 09 27 12.15 -07 43 47.9 V K87
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)