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
2021-03-01 18:11:14 C 09 46 07.03 -10 51 47.1 N42
2021-03-01 18:12:26 C 09 46 06.72 -10 51 44.6 N42
2021-03-01 18:20:52 C 09 46 08.11 -10 51 21.5 V A84
2021-03-01 18:22:22 C 09 46 07.80 -10 51 19.1 V A84
2021-03-01 18:23:15 C 09 46 07.62 -10 51 17.6 V A84
2021-03-01 18:23:59 C 09 46 07.46 -10 51 16.2 V A84
2021-03-01 18:24:44 C 09 46 07.32 -10 51 15.0 V A84
2021-03-01 18:26:01 C 09 46 07.05 -10 51 12.7 V A84
2021-03-01 18:26:18 C 09 46 06.98 -10 51 12.1 V A84
2021-03-01 18:39:26 C 09 46 04.25 -10 50 49.7 V A84
2021-03-01 18:40:30 C 09 46 01.87 -10 51 03.8 q 168
2021-03-01 18:45:01 C 09 46 03.11 -10 50 39.5 V A84
2021-03-01 18:48:29 C 09 46 00.23 -10 50 49.6 q 168
2021-03-01 18:51:01 C 09 46 01.84 -10 50 28.8 V A84
2021-03-01 18:53:00 C 09 46 01.41 -10 50 24.7 V A84
2021-03-01 18:54:30 C 09 45 59.00 -10 50 38.7 q 168
2021-03-01 18:57:03 C 09 46 00.59 -10 50 18.1 V A84
2021-03-01 18:58:52 C 09 46 00.21 -10 50 14.8 V A84
2021-03-01 19:00:42 C 09 45 59.82 -10 50 11.6 V A84
2021-03-01 19:02:32 C 09 45 59.44 -10 50 08.4 V A84
2021-03-01 19:04:21 C 09 45 59.06 -10 50 05.1 V A84
2021-03-01 19:04:30 C 09 45 56.94 -10 50 20.9 q 168
2021-03-01 19:06:10 C 09 45 58.68 -10 50 01.9 V A84
2021-03-01 19:08:01 C 09 45 58.30 -10 49 58.7 V A84
2021-03-01 19:09:51 C 09 45 57.91 -10 49 55.5 V A84
2021-03-01 19:11:40 C 09 45 57.53 -10 49 52.3 V A84
2021-03-01 19:13:30 C 09 45 57.15 -10 49 49.1 V A84
2021-03-01 19:15:20 C 09 45 56.77 -10 49 45.9 V A84
2021-03-01 19:17:10 C 09 45 56.38 -10 49 42.6 V A84
2021-03-01 19:18:59 C 09 45 56.01 -10 49 39.4 V A84
2021-03-01 19:20:49 C 09 45 55.62 -10 49 36.1 V A84
2021-03-01 19:22:39 C 09 45 55.24 -10 49 33.0 V A84
2021-03-01 19:24:29 C 09 45 54.85 -10 49 29.7 V A84
2021-03-01 19:24:29 C 09 45 52.83 -10 49 45.1 q 168
2021-03-01 19:26:18 C 09 45 54.47 -10 49 26.5 V A84
2021-03-01 19:28:08 C 09 45 54.09 -10 49 23.2 V A84
2021-03-01 19:31:44 C 09 45 53.80 -10 49 25.6 V K61
2021-03-01 19:31:48 C 09 45 53.32 -10 49 16.8 V A84
2021-03-01 19:33:35 C 09 45 53.43 -10 49 22.3 V K61
2021-03-01 19:33:37 C 09 45 52.95 -10 49 13.6 V A84
2021-03-01 19:34:44 C 09 45 53.20 -10 49 20.1 V K61
2021-03-01 19:35:25 C 09 45 53.05 -10 49 18.9 V K61
2021-03-01 19:35:27 C 09 45 52.55 -10 49 10.4 V A84
2021-03-01 19:36:48 C 09 45 52.77 -10 49 16.6 V K61
2021-03-01 19:37:17 C 09 45 52.16 -10 49 07.2 V A84
2021-03-01 19:37:43 C 09 45 52.58 -10 49 14.7 V K61
2021-03-01 19:39:06 C 09 45 51.78 -10 49 03.9 V A84
2021-03-01 19:40:56 C 09 45 51.40 -10 49 00.7 V A84
2021-03-01 19:42:46 C 09 45 51.01 -10 48 57.4 V A84
2021-03-01 19:44:35 C 09 45 50.63 -10 48 54.1 V A84
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)