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
2021-03-03 01:44:05 s 1 -151826.47 6 +310757.72 8470.0 C57
2021-03-03 01:54:05 S 09 42 21.655 -10 09 12.85 V C57
2021-03-03 01:54:05 s 1 -152088.59 5 +310383.67 3490.0 C57
2021-03-03 02:04:05 S 09 42 19.327 -10 08 54.89 V C57
2021-03-03 02:04:05 s 1 -152350.18 9 +310008.55 7590.0 C57
2021-03-03 02:14:05 S 09 42 16.999 -10 08 38.18 V C57
2021-03-03 02:14:05 s 1 -152611.25 6 +309632.36 790.0 C57
2021-03-03 02:16:47 C 09 39 58.51 -09 53 19.8 S 932
2021-03-03 02:24:05 S 09 42 14.638 -10 08 19.46 V C57
2021-03-03 02:24:05 s 1 -152871.79 4 +309255.10 3070.0 C57
2021-03-03 02:29:53 C 09 39 55.78 -09 52 55.4 S 932
2021-03-03 02:34:05 S 09 42 12.302 -10 08 00.13 V C57
2021-03-03 02:34:05 s 1 -153131.80 1 +308876.77 4430.0 C57
2021-03-03 02:44:05 S 09 42 09.958 -10 07 42.10 V C57
2021-03-03 02:44:05 s 1 -153391.27 4 +308497.36 4880.0 C57
2021-03-03 02:44:10 C 09 39 52.82 -09 52 29.0 S 932
2021-03-03 02:54:05 S 09 42 07.673 -10 07 24.56 V C57
2021-03-03 02:54:05 s 1 -153650.21 3 +308116.89 4390.0 C57
2021-03-03 03:04:05 S 09 42 05.405 -10 07 07.39 V C57
2021-03-03 03:04:05 s 1 -153908.61 5 +307735.34 2980.0 C57
2021-03-03 03:14:05 S 09 42 03.019 -10 06 49.36 V C57
2021-03-03 03:14:05 s 1 -154166.47 9 +307352.71 630.0 C57
2021-03-03 03:24:05 S 09 42 00.636 -10 06 29.20 V C57
2021-03-03 03:24:05 s 1 -154423.80 2 +306969.01 7350.0 C57
2021-03-03 03:34:05 S 09 41 58.262 -10 06 10.58 V C57
2021-03-03 03:34:05 s 1 -154680.58 2 +306584.23 3130.0 C57
2021-03-03 03:44:05 S 09 41 55.920 -10 05 53.56 V C57
2021-03-03 03:44:05 s 1 -154936.81 8 +306198.38 7960.0 C57
2021-03-03 03:54:05 S 09 41 53.635 -10 05 35.59 V C57
2021-03-03 03:54:05 s 1 -155192.50 7 +305811.45 1850.0 C57
2021-03-03 04:04:05 S 09 41 51.298 -10 05 17.48 V C57
2021-03-03 04:04:05 s 1 -155447.64 8 +305423.44 4790.0 C57
2021-03-03 04:14:05 S 09 41 48.974 -10 04 58.62 V C57
2021-03-03 04:14:05 s 1 -155702.23 9 +305034.35 6770.0 C57
2021-03-03 04:24:05 S 09 41 46.644 -10 04 40.12 V C57
2021-03-03 04:24:05 s 1 -155956.27 7 +304644.19 7790.0 C57
2021-03-03 04:34:05 S 09 41 44.290 -10 04 22.73 V C57
2021-03-03 04:34:05 s 1 -156209.76 1 +304252.94 7850.0 C57
2021-03-03 04:44:05 S 09 41 41.935 -10 04 04.22 V C57
2021-03-03 04:44:05 s 1 -156462.68 9 +303860.61 6950.0 C57
2021-03-03 04:53:57 C 09 39 25.95 -09 48 28.1 V W62
2021-03-03 04:54:05 S 09 41 39.581 -10 03 46.33 V C57
2021-03-03 04:54:05 s 1 -156715.05 8 +303467.20 5070.0 C57
2021-03-03 05:04:05 S 09 41 37.229 -10 03 26.60 V C57
2021-03-03 05:04:05 s 1 -156966.86 7 +303072.71 2220.0 C57
2021-03-03 05:08:17 C 09 39 22.99 -09 48 01.0 V W62
2021-03-03 05:14:05 S 09 41 34.956 -10 03 08.78 V C57
2021-03-03 05:14:05 s 1 -157218.11 3 +302677.13 8400.0 C57
2021-03-03 05:22:22 C 09 39 20.06 -09 47 33.9 V W62
2021-03-03 05:24:05 S 09 41 32.606 -10 02 51.11 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)