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
2013-01-09 01:36:20 C 09 13 04.30 -24 51 01.5 o 071
2013-01-09 01:38:39 C 09 13 03.67 -24 50 59.0 o 071
2013-01-09 01:40:57 C 09 13 03.08 -24 50 56.7 o 071
2013-01-09 01:43:16 C 09 13 02.46 -24 50 54.5 o 071
2013-01-09 01:45:40 C 09 13 03.30 -24 50 55.9 u B04
2013-01-09 16:34:49 C 09 09 24.56 -24 34 17.6 q E12
2013-01-09 16:45:55 C 09 09 21.57 -24 34 05.8 q E12
2013-01-09 16:57:15 C 09 09 18.50 -24 33 53.5 q E12
2013-01-09 17:08:44 C 09 09 15.41 -24 33 41.1 q E12
2013-01-09 17:28:58 C 09 09 09.96 -24 33 19.0 c Q62
2013-01-09 17:31:22 C 09 09 09.31 -24 33 16.4 c Q62
2013-01-09 17:33:36 C 09 09 08.71 -24 33 14.0 c Q62
2013-01-09 17:35:38 C 09 09 08.17 -24 33 11.7 c Q62
2013-01-09 22:59:56 C 09 07 52.17 -24 29 06.9 q C73
2013-01-09 23:01:05 C 09 07 51.83 -24 29 05.9 q C73
2013-01-09 23:02:15 C 09 07 51.41 -24 29 04.7 q C73
2013-01-09 23:03:25 C 09 07 51.16 -24 29 03.2 q C73
2013-01-09 23:04:33 C 09 07 50.83 -24 29 01.5 q C73
2013-01-09 23:05:43 C 09 07 50.52 -24 29 00.2 q C73
2013-01-09 23:06:52 C 09 07 50.29 -24 28 59.9 q C73
2013-01-09 23:08:02 C 09 07 50.04 -24 28 58.1 q C73
2013-01-09 23:09:11 C 09 07 49.59 -24 28 56.8 q C73
2013-01-09 23:10:21 C 09 07 49.26 -24 28 53.8 q C73
2013-01-09 23:11:30 C 09 07 49.03 -24 28 54.9 q C73
2013-01-09 23:12:40 C 09 07 48.69 -24 28 53.6 q C73
2013-01-09 23:13:50 C 09 07 48.38 -24 28 52.5 q C73
2013-01-09 23:15:00 C 09 07 48.10 -24 28 51.2 q C73
2013-01-09 23:16:09 C 09 07 47.77 -24 28 49.7 q C73
2013-01-09 23:17:19 C 09 07 47.49 -24 28 49.1 q C73
2013-01-09 23:18:28 C 09 07 47.19 -24 28 47.8 q C73
2013-01-09 23:19:38 C 09 07 46.86 -24 28 46.0 q C73
2013-01-09 23:20:47 C 09 07 46.54 -24 28 45.7 q C73
2013-01-09 23:21:57 C 09 07 46.22 -24 28 43.6 q C73
2013-01-09 23:23:09 C 09 07 45.90 -24 28 42.9 q C73
2013-01-09 23:24:18 C 09 07 45.56 -24 28 41.2 q C73
2013-01-09 23:25:28 C 09 07 45.34 -24 28 39.9 q C73
2013-01-09 23:26:37 C 09 07 44.96 -24 28 38.8 q C73
2013-01-09 23:27:46 C 09 07 44.65 -24 28 38.0 q C73
2013-01-09 23:28:56 C 09 07 44.35 -24 28 36.2 q C73
2013-01-09 23:30:04 C 09 07 44.08 -24 28 35.9 q C73
2013-01-09 23:31:14 C 09 07 43.76 -24 28 34.8 q C73
2013-01-09 23:32:23 C 09 07 43.43 -24 28 32.5 q C73
2013-01-09 23:33:33 C 09 07 43.12 -24 28 31.4 q C73
2013-01-09 23:34:42 C 09 07 42.84 -24 28 30.8 q C73
2013-01-09 23:35:52 C 09 07 42.52 -24 28 28.4 q C73
2013-01-09 23:37:01 C 09 07 42.30 -24 28 29.3 q C73
2013-01-09 23:38:11 C 09 07 41.84 -24 28 26.2 q C73
2013-01-09 23:39:21 C 09 07 41.65 -24 28 25.3 q C73
2013-01-09 23:40:31 C 09 07 41.30 -24 28 24.2 q C73
2013-01-10 01:00:57 C 09 07 18.722 -24 26 53.34 15.81 q C20
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)