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 08:04:05 s 1 -192911.40 9 +126684.06 1380.0 C57
2021-03-05 08:14:05 S 09 29 30.946 -08 23 52.01 V C57
2021-03-05 08:14:05 s 1 -192818.01 2 +125906.95 8720.0 C57
2021-03-05 08:24:05 S 09 29 28.608 -08 23 31.88 V C57
2021-03-05 08:24:05 s 1 -192722.43 3 +125128.41 1960.0 C57
2021-03-05 08:34:05 S 09 29 26.232 -08 23 11.18 V C57
2021-03-05 08:34:05 s 1 -192624.65 7 +124348.46 1090.0 C57
2021-03-05 08:44:05 S 09 29 23.909 -08 22 49.62 V C57
2021-03-05 08:44:05 s 1 -192524.67 2 +123567.08 6060.0 C57
2021-03-05 08:54:05 S 09 29 21.550 -08 22 29.06 V C57
2021-03-05 08:54:05 s 1 -192422.46 4 +122784.28 6870.0 C57
2021-03-05 09:04:05 S 09 29 19.234 -08 22 08.58 V C57
2021-03-05 09:04:05 s 1 -192318.02 1 +122000.05 3480.0 C57
2021-03-05 09:14:05 S 09 29 16.894 -08 21 46.94 V C57
2021-03-05 09:14:05 s 1 -192211.32 8 +121214.40 5870.0 C57
2021-03-05 09:24:05 S 09 29 14.522 -08 21 25.88 V C57
2021-03-05 09:24:05 s 1 -192102.37 2 +120427.33 4000.0 C57
2021-03-05 09:34:05 S 09 29 12.199 -08 21 05.36 V C57
2021-03-05 09:34:05 s 1 -191991.13 9 +119638.83 7860.0 C57
2021-03-05 09:44:05 S 09 29 09.806 -08 20 44.95 V C57
2021-03-05 09:44:05 s 1 -191877.61 6 +118848.92 7410.0 C57
2021-03-05 09:54:05 S 09 29 07.478 -08 20 23.03 V C57
2021-03-05 09:54:05 s 1 -191761.78 9 +118057.57 2640.0 C57
2021-03-05 10:04:05 S 09 29 05.112 -08 20 02.40 V C57
2021-03-05 10:04:05 s 1 -191643.64 2 +117264.80 3500.0 C57
2021-03-05 10:14:05 S 09 29 02.765 -08 19 42.17 V C57
2021-03-05 10:14:05 s 1 -191523.16 3 +116470.61 9980.0 C57
2021-03-05 10:24:05 S 09 29 00.406 -08 19 19.92 V C57
2021-03-05 10:24:05 s 1 -191400.33 6 +115675.00 2040.0 C57
2021-03-05 10:34:05 S 09 28 58.106 -08 18 59.22 V C57
2021-03-05 10:34:05 s 1 -191275.14 8 +114877.96 9660.0 C57
2021-03-05 10:44:05 S 09 28 55.718 -08 18 38.81 V C57
2021-03-05 10:44:05 s 1 -191147.58 3 +114079.50 2810.0 C57
2021-03-05 10:50:40 C 09 29 14.39 -08 05 13.6 V T05
2021-03-05 10:54:05 S 09 28 53.393 -08 18 17.57 V C57
2021-03-05 10:54:05 s 1 -191017.62 7 +113279.61 1460.0 C57
2021-03-05 10:56:37 C 09 29 13.17 -08 05 01.9 V T05
2021-03-05 11:04:05 S 09 28 51.079 -08 17 55.93 V C57
2021-03-05 11:04:05 s 1 -190885.26 5 +112478.30 5580.0 C57
2021-03-05 11:05:12 C 09 29 11.42 -08 04 45.0 V T05
2021-03-05 11:14:05 S 09 28 48.686 -08 17 35.70 V C57
2021-03-05 11:14:05 s 1 -190750.48 2 +111675.57 5140.0 C57
2021-03-05 11:24:05 S 09 28 46.358 -08 17 14.53 V C57
2021-03-05 11:24:05 s 1 -190613.26 3 +110871.41 120.0 C57
2021-03-05 11:24:20 C 09 29 07.53 -08 04 07.3 V T05
2021-03-05 11:34:05 S 09 28 44.050 -08 16 52.46 V C57
2021-03-05 11:34:05 s 1 -190473.59 2 +110065.83 470.0 C57
2021-03-05 11:44:05 S 09 28 41.710 -08 16 32.20 V C57
2021-03-05 11:44:05 s 1 -190331.45 4 +109258.84 6180.0 C57
2021-03-05 11:54:05 S 09 28 39.374 -08 16 11.53 V C57
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)