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
2021-02-28 12:54:05 S 09 56 00.895 -11 52 00.98 V C57
2021-02-28 12:54:05 s 1 -32783.281 0 +379381.22 2270.0 C57
2021-02-28 13:04:05 S 09 55 58.781 -11 51 45.86 V C57
2021-02-28 13:04:05 s 1 -33147.514 0 +379373.83 1010.0 C57
2021-02-28 13:14:05 S 09 55 56.678 -11 51 31.07 V C57
2021-02-28 13:14:05 s 1 -33511.659 0 +379365.44 9660.0 C57
2021-02-28 13:24:05 S 09 55 54.494 -11 51 15.30 V C57
2021-02-28 13:24:05 s 1 -33875.714 0 +379356.06 8210.0 C57
2021-02-28 13:34:05 S 09 55 52.356 -11 51 00.07 V C57
2021-02-28 13:34:05 s 1 -34239.679 0 +379345.68 6670.0 C57
2021-02-28 13:44:05 S 09 55 50.249 -11 50 44.48 V C57
2021-02-28 13:44:05 s 1 -34603.553 0 +379334.31 5030.0 C57
2021-02-28 13:54:05 S 09 55 48.110 -11 50 27.64 V C57
2021-02-28 13:54:05 s 1 -34967.334 0 +379321.95 3290.0 C57
2021-02-28 14:04:05 S 09 55 46.051 -11 50 12.16 V C57
2021-02-28 14:04:05 s 1 -35331.022 0 +379308.59 1450.0 C57
2021-02-28 14:14:05 S 09 55 43.884 -11 49 56.60 V C57
2021-02-28 14:14:05 s 1 -35694.616 0 +379294.24 9510.0 C57
2021-02-28 14:24:05 S 09 55 41.734 -11 49 41.74 V C57
2021-02-28 14:24:05 s 1 -36058.115 0 +379278.90 7460.0 C57
2021-02-28 14:34:05 S 09 55 39.631 -11 49 26.04 V C57
2021-02-28 14:34:05 s 1 -36421.517 0 +379262.56 5310.0 C57
2021-02-28 14:44:05 S 09 55 37.442 -11 49 09.41 V C57
2021-02-28 14:44:05 s 1 -36784.823 0 +379245.23 3050.0 C57
2021-02-28 15:04:05 S 09 55 33.250 -11 48 38.09 V C57
2021-02-28 15:04:05 s 1 -37511.140 0 +379207.60 8190.0 C57
2021-02-28 15:14:05 S 09 55 31.039 -11 48 22.68 V C57
2021-02-28 15:14:05 s 1 -37874.150 0 +379187.29 5600.0 C57
2021-02-28 15:24:05 S 09 55 28.954 -11 48 07.49 V C57
2021-02-28 15:24:05 s 1 -38237.058 0 +379165.99 2890.0 C57
2021-02-28 15:34:05 S 09 55 26.774 -11 47 51.90 V C57
2021-02-28 15:34:05 s 1 -38599.865 0 +379143.70 60.0 C57
2021-02-28 15:44:05 S 09 55 24.672 -11 47 35.48 V C57
2021-02-28 15:44:05 s 1 -38962.570 0 +379120.42 7110.0 C57
2021-02-28 15:54:05 S 09 55 22.577 -11 47 19.03 V C57
2021-02-28 15:54:05 s 1 -39325.171 0 +379096.15 4050.0 C57
2021-02-28 16:04:05 S 09 55 20.426 -11 47 03.70 V C57
2021-02-28 16:04:05 s 1 -39687.668 0 +379070.88 860.0 C57
2021-02-28 16:14:05 S 09 55 18.262 -11 46 48.11 V C57
2021-02-28 16:14:05 s 1 -40050.059 0 +379044.63 7540.0 C57
2021-02-28 16:24:05 S 09 55 16.092 -11 46 32.59 V C57
2021-02-28 16:24:05 s 1 -40412.344 0 +379017.38 4110.0 C57
2021-02-28 16:34:05 S 09 55 13.946 -11 46 17.26 V C57
2021-02-28 16:34:05 s 1 -40774.522 0 +378989.15 540.0 C57
2021-02-28 16:44:05 S 09 55 11.856 -11 46 01.06 V C57
2021-02-28 16:44:05 s 1 -41136.591 0 +378959.92 6850.0 C57
2021-02-28 16:54:05 S 09 55 09.720 -11 45 45.04 V C57
2021-02-28 16:54:05 s 1 -41498.552 0 +378929.70 3020.0 C57
2021-02-28 17:04:05 S 09 55 07.570 -11 45 29.59 V C57
2021-02-28 17:04:05 s 1 -41860.402 0 +378898.50 9070.0 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)