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
2013-02-28 03:04:41 C 06 44 32.00 +07 17 42.4 q H45
2013-02-28 03:06:52 C 06 44 31.99 +07 17 44.7 q H45
2013-02-28 03:09:08 C 06 44 31.98 +07 17 47.1 q H45
2013-02-28 18:24:59 C 06 44 41.88 +07 33 31.9 u 585
2013-02-28 18:29:09 C 06 44 41.87 +07 33 36.2 u 585
2013-02-28 18:31:11 C 06 44 41.88 +07 33 38.1 u 585
2013-02-28 18:33:12 C 06 44 41.88 +07 33 40.4 u 585
2013-02-28 18:35:13 C 06 44 41.89 +07 33 42.4 u 585
2013-02-28 18:37:43 C 06 44 41.89 +07 33 45.1 u 585
2013-02-28 18:39:44 C 06 44 41.91 +07 33 47.0 u 585
2013-02-28 18:41:45 C 06 44 41.91 +07 33 49.2 u 585
2013-02-28 18:43:47 C 06 44 41.91 +07 33 51.2 u 585
2013-03-01 03:01:26 C 06 44 47.73 +07 42 33.0 q H45
2013-03-01 03:03:14 C 06 44 47.73 +07 42 34.7 q H45
2013-03-01 03:05:34 C 06 44 47.73 +07 42 37.0 q H45
2013-03-01 03:16:25 C 06 44 47.75 +07 42 48.1 q H45
2013-03-01 03:19:01 C 06 44 47.76 +07 42 50.8 q H45
2013-03-01 03:20:42 C 06 44 47.76 +07 42 52.4 q H45
2013-03-01 12:03:16 C 06 44 56.239 +07 51 50.15 q O44
2013-03-01 12:05:29 C 06 44 56.245 +07 51 52.37 q O44
2013-03-01 12:07:46 C 06 44 56.250 +07 51 54.61 q O44
2013-03-01 12:09:59 C 06 44 56.257 +07 51 56.97 q O44
2013-03-01 12:12:13 C 06 44 56.260 +07 51 59.28 q O44
2013-03-01 12:14:29 C 06 44 56.265 +07 52 01.62 q O44
2013-03-01 12:16:43 C 06 44 56.272 +07 52 03.90 q O44
2013-03-01 12:18:57 C 06 44 56.277 +07 52 06.08 q O44
2013-03-01 12:21:13 C 06 44 56.284 +07 52 08.38 q O44
2013-03-01 12:23:27 C 06 44 56.288 +07 52 10.85 q O44
2013-03-01 12:25:41 C 06 44 56.292 +07 52 13.05 q O44
2013-03-01 12:27:57 C 06 44 56.298 +07 52 15.20 q O44
2013-03-01 12:30:11 C 06 44 56.302 +07 52 17.58 q O44
2013-03-01 12:32:25 C 06 44 56.303 +07 52 19.85 q O44
2013-03-01 21:59:39 C 06 45 02.50 +08 01 36.7 u B04
2013-03-01 22:02:42 C 06 45 02.51 +08 01 39.8 u B04
2013-03-01 22:05:46 C 06 45 02.55 +08 01 42.7 u B04
2013-03-01 22:08:49 C 06 45 02.56 +08 01 45.6 u B04
2013-03-02 12:07:38 C 06 45 17.968 +08 15 52.53 q O44
2013-03-02 12:09:52 C 06 45 17.979 +08 15 54.79 q O44
2013-03-02 12:12:06 C 06 45 17.993 +08 15 56.98 q O44
2013-03-02 12:14:22 C 06 45 18.005 +08 15 59.18 q O44
2013-03-02 12:16:36 C 06 45 18.018 +08 16 01.47 q O44
2013-03-02 12:18:50 C 06 45 18.027 +08 16 03.62 q O44
2013-03-02 12:21:06 C 06 45 18.041 +08 16 05.94 q O44
2013-03-02 12:23:20 C 06 45 18.050 +08 16 07.99 q O44
2013-03-02 12:25:34 C 06 45 18.062 +08 16 10.38 q O44
2013-03-02 12:27:50 C 06 45 18.076 +08 16 12.55 q O44
2013-03-02 12:30:04 C 06 45 18.090 +08 16 14.83 q O44
2013-03-02 12:32:18 C 06 45 18.099 +08 16 17.01 q O44
2013-03-02 12:34:32 C 06 45 18.109 +08 16 19.17 q O44
2013-03-03 03:06:19 C 06 45 32.23 +08 30 24.1 q H45
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)