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
2021-03-02 20:10:34 C 09 41 08.26 -10 04 39.7 V L54
2021-03-02 20:14:05 S 09 43 40.706 -10 19 25.93 V C57
2021-03-02 20:14:05 s 1 -142893.68 2 +322505.68 6220.0 C57
2021-03-02 20:24:05 S 09 43 38.374 -10 19 08.36 V C57
2021-03-02 20:24:05 s 1 -143172.13 1 +322166.56 9280.0 C57
2021-03-02 20:34:05 S 09 43 36.017 -10 18 49.68 V C57
2021-03-02 20:34:05 s 1 -143450.11 2 +321826.39 1550.0 C57
2021-03-02 20:34:20 C 09 41 03.34 -10 03 56.2 V L54
2021-03-02 20:44:05 S 09 43 33.708 -10 18 30.89 V C57
2021-03-02 20:44:05 s 1 -143727.62 4 +321485.17 3020.0 C57
2021-03-02 20:54:05 S 09 43 31.394 -10 18 13.25 V C57
2021-03-02 20:54:05 s 1 -144004.66 5 +321142.90 3680.0 C57
2021-03-02 20:58:05 C 09 40 58.39 -10 03 12.8 V L54
2021-03-02 21:04:05 S 09 43 29.090 -10 17 56.08 V C57
2021-03-02 21:04:05 s 1 -144281.23 5 +320799.58 3540.0 C57
2021-03-02 21:23:01 C 09 40 53.21 -10 02 26.8 V L54
2021-03-02 21:24:05 S 09 43 24.456 -10 17 20.40 V C57
2021-03-02 21:24:05 s 1 -144832.95 0 +320109.79 810.0 C57
2021-03-02 21:34:05 S 09 43 22.109 -10 17 01.39 V C57
2021-03-02 21:34:05 s 1 -145108.09 3 +319763.32 8220.0 C57
2021-03-02 21:44:05 S 09 43 19.781 -10 16 43.68 V C57
2021-03-02 21:44:05 s 1 -145382.75 7 +319415.79 4820.0 C57
2021-03-02 21:46:33 C 09 40 49.01 -10 01 40.2 U 470
2021-03-02 21:48:28 C 09 40 48.12 -10 01 42.1 q 056
2021-03-02 21:48:37 C 09 40 48.54 -10 01 36.2 U 470
2021-03-02 21:52:19 C 09 40 47.11 -10 01 32.5 V L54
2021-03-02 21:53:13 C 09 40 47.13 -10 01 33.6 q 056
2021-03-02 21:54:05 S 09 43 17.477 -10 16 26.15 V C57
2021-03-02 21:54:05 s 1 -145656.94 0 +319067.21 590.0 C57
2021-03-02 21:55:50 C 09 40 47.22 -10 01 26.2 V 130
2021-03-02 21:57:23 C 09 40 46.90 -10 01 23.4 V 130
2021-03-02 21:57:57 C 09 40 46.18 -10 01 24.7 q 056
2021-03-02 21:59:17 C 09 40 46.51 -10 01 19.9 V 130
2021-03-02 22:00:34 C 09 40 46.81 -10 01 21.9 V Z80
2021-03-02 22:00:49 C 09 40 46.17 -10 01 17.0 V 130
2021-03-02 22:02:42 C 09 40 45.18 -10 01 15.9 q 056
2021-03-02 22:04:05 S 09 43 15.156 -10 16 08.83 V C57
2021-03-02 22:04:05 s 1 -145930.64 1 +318717.58 5530.0 C57
2021-03-02 22:07:26 C 09 40 44.19 -10 01 07.1 q 056
2021-03-02 22:12:12 C 09 40 43.22 -10 00 58.2 q 056
2021-03-02 22:14:05 S 09 43 12.847 -10 15 50.69 V C57
2021-03-02 22:14:05 s 1 -146203.85 8 +318366.89 9640.0 C57
2021-03-02 22:15:48 C 09 40 43.68 -10 00 53.0 V Z80
2021-03-02 22:16:57 C 09 40 42.25 -10 00 49.6 q 056
2021-03-02 22:20:48 C 09 40 41.21 -10 00 40.1 V L54
2021-03-02 22:21:42 C 09 40 41.29 -10 00 40.3 q 056
2021-03-02 22:24:05 S 09 43 10.517 -10 15 31.07 V C57
2021-03-02 22:24:05 s 1 -146476.58 8 +318015.14 2920.0 C57
2021-03-02 22:26:25 C 09 40 40.29 -10 00 32.1 q 056
2021-03-02 22:28:26 C 09 40 40.60 -10 00 29.9 V G33
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)