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
2021-02-17 20:29:19 C 10 39 40.10 -17 21 36.7 V M43
2021-02-17 20:30:02 C 10 39 38.46 -17 21 50.4 N42
2021-02-17 20:30:14 C 10 39 39.05 -17 21 48.0 V 186
2021-02-17 20:31:19 C 10 39 38.23 -17 21 49.3 N42
2021-02-17 20:32:17 C 10 39 42.14 -17 20 35.2 V 221
2021-02-17 20:32:37 C 10 39 37.99 -17 21 48.1 N42
2021-02-17 20:33:54 C 10 39 37.76 -17 21 46.8 N42
2021-02-17 20:34:02 C 10 39 41.82 -17 20 33.7 V 221
2021-02-17 20:35:12 C 10 39 37.51 -17 21 45.6 N42
2021-02-17 20:35:45 C 10 39 41.51 -17 20 32.4 V 221
2021-02-17 20:36:10 C 10 39 38.83 -17 21 30.8 V M43
2021-02-17 20:36:29 C 10 39 37.27 -17 21 44.6 N42
2021-02-17 20:37:46 C 10 39 37.01 -17 21 43.3 N42
2021-02-17 20:39:03 C 10 39 36.79 -17 21 42.2 N42
2021-02-17 20:40:21 C 10 39 36.55 -17 21 41.0 N42
2021-02-17 20:41:38 C 10 39 36.33 -17 21 39.9 N42
2021-02-17 20:42:56 C 10 39 36.08 -17 21 38.7 N42
2021-02-17 20:42:59 C 10 39 37.56 -17 21 24.2 V M43
2021-02-17 20:44:13 C 10 39 35.85 -17 21 37.6 N42
2021-02-17 20:45:29 C 10 39 35.60 -17 21 36.4 N42
2021-02-17 20:46:47 C 10 39 35.37 -17 21 34.9 N42
2021-02-17 20:48:04 C 10 39 35.13 -17 21 33.9 N42
2021-02-17 20:49:22 C 10 39 34.88 -17 21 32.7 N42
2021-02-17 20:50:39 C 10 39 34.64 -17 21 31.6 N42
2021-02-17 20:51:57 C 10 39 34.41 -17 21 30.6 N42
2021-02-17 20:53:14 C 10 39 34.18 -17 21 29.3 N42
2021-02-17 20:54:03 C 10 39 38.15 -17 20 17.1 V 221
2021-02-17 20:54:31 C 10 39 33.94 -17 21 27.9 N42
2021-02-17 20:55:01 C 10 39 34.41 -17 21 25.6 V 186
2021-02-17 20:55:47 C 10 39 37.81 -17 20 15.6 V 221
2021-02-17 20:55:49 C 10 39 33.68 -17 21 26.9 N42
2021-02-17 20:57:32 C 10 39 37.49 -17 20 14.2 V 221
2021-02-17 20:58:06 C 10 39 33.77 -17 21 22.9 V 186
2021-02-17 21:11:38 C 10 39 31.88 -17 21 19.9 q 168
2021-02-17 21:21:55 C 10 39 32.98 -17 19 53.6 V 221
2021-02-17 21:23:51 C 10 39 32.61 -17 19 52.0 V 221
2021-02-17 21:25:37 C 10 39 32.29 -17 19 50.5 V 221
2021-02-17 21:45:38 C 10 39 25.69 -17 20 49.0 q 168
2021-02-17 21:57:05 C 10 39 26.40 -17 19 23.6 V 221
2021-02-17 21:58:50 C 10 39 26.07 -17 19 22.0 V 221
2021-02-17 22:00:34 C 10 39 25.74 -17 19 20.5 V 221
2021-02-17 22:24:41 C 10 39 21.20 -17 18 59.6 V 221
2021-02-17 22:26:48 C 10 39 20.80 -17 18 57.8 V 221
2021-02-17 22:28:32 C 10 39 20.46 -17 18 56.2 V 221
2021-02-17 22:31:37 C 10 39 17.34 -17 20 06.9 q 168
2021-02-17 22:51:42 C 10 39 16.28 -17 19 44.4 V 204
2021-02-17 22:54:02 C 10 39 15.87 -17 19 42.4 V 204
2021-02-17 22:59:54 C 10 39 14.77 -17 19 37.2 V 204
2021-02-18 07:08:27 C 10 37 51.16 -17 12 00.8 o 691
2021-02-18 07:10:41 C 10 37 50.74 -17 11 58.7 o 691
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)