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
2020-12-21 14:46:26 C 11 32 35.35 -11 26 40.4 V T08
2020-12-21 14:49:07 C 11 32 35.45 -11 26 42.5 V T08
2020-12-21 15:01:43 C 11 32 35.78 -11 26 50.7 V T08
2020-12-21 15:17:21 C 11 32 36.184 -11 27 00.73 U F51
2020-12-21 15:34:19 C 11 32 36.58 -11 27 11.0 V T08
2020-12-22 09:34:15 C 11 33 15.17 -11 38 36.9 u H21
2020-12-22 09:43:07 C 11 33 16.14 -11 38 37.4 o 691
2020-12-22 09:54:50 C 11 33 16.48 -11 38 45.2 o 691
2020-12-22 10:06:34 C 11 33 16.86 -11 38 52.9 o 691
2020-12-22 10:15:24 C 11 33 16.28 -11 39 02.7 u H21
2020-12-22 10:25:46 C 11 33 17.32 -11 39 05.9 V 703
2020-12-22 10:33:57 C 11 33 17.51 -11 39 09.9 V 703
2020-12-22 10:35:59 C 11 33 17.12 -11 39 14.9 q 734
2020-12-22 10:42:09 C 11 33 17.77 -11 39 16.1 V 703
2020-12-22 10:47:47 C 11 33 17.43 -11 39 22.7 q 734
2020-12-22 10:50:20 C 11 33 18.03 -11 39 21.3 V 703
2020-12-22 11:11:11 C 11 33 18.06 -11 39 37.6 q 734
2020-12-22 11:13:56 C 11 33 18.64 -11 39 36.4 V I52
2020-12-22 11:21:06 C 11 33 18.84 -11 39 40.8 V I52
2020-12-22 11:28:16 C 11 33 19.03 -11 39 45.4 V I52
2020-12-22 11:35:26 C 11 33 19.22 -11 39 49.9 V I52
2020-12-22 12:09:38 C 11 33 20.13 -11 40 11.5 V G96
2020-12-22 12:17:04 C 11 33 20.32 -11 40 16.1 V G96
2020-12-22 12:24:29 C 11 33 20.52 -11 40 20.8 V G96
2020-12-22 12:31:55 C 11 33 20.71 -11 40 25.4 V G96
2020-12-22 14:14:20 C 11 33 25.018 -11 41 23.45 U F51
2020-12-22 14:32:01 C 11 33 25.476 -11 41 34.74 U F51
2020-12-22 14:49:32 C 11 33 25.925 -11 41 45.90 U F52
2020-12-22 14:49:42 C 11 33 25.928 -11 41 45.97 U F51
2020-12-22 15:06:12 C 11 33 26.350 -11 41 56.48 U F52
2020-12-22 15:22:55 C 11 33 26.772 -11 42 07.03 U F52
2020-12-22 15:39:37 C 11 33 27.193 -11 42 17.50 U F52
2020-12-23 13:50:55 C 11 34 13.82 -11 56 09.1 V T05
2020-12-23 13:54:13 C 11 34 13.87 -11 56 10.9 V T05
2020-12-23 13:58:50 C 11 34 14.04 -11 56 13.8 V T05
2020-12-23 14:06:06 C 11 34 14.22 -11 56 19.2 V T05
2020-12-24 00:05:15 C 11 34 35.145 -12 01 59.63 V K91
2020-12-24 00:06:41 C 11 34 35.188 -12 02 00.58 V K91
2020-12-24 00:08:08 C 11 34 35.228 -12 02 01.51 V K91
2020-12-24 00:09:35 C 11 34 35.275 -12 02 02.40 V K91
2020-12-24 00:11:02 C 11 34 35.313 -12 02 03.39 V K91
2020-12-24 00:12:29 C 11 34 35.354 -12 02 04.34 V K91
2020-12-24 14:56:14 C 11 35 03.57 -12 11 47.7 V T08
2020-12-24 15:00:55 C 11 35 03.68 -12 11 50.6 V T08
2020-12-24 15:13:45 C 11 35 03.99 -12 11 58.6 V T08
2020-12-24 15:44:25 C 11 35 04.66 -12 12 17.7 V T08
2020-12-25 14:30:47 C 11 35 49.83 -12 26 25.9 V T08
2020-12-25 14:33:27 C 11 35 49.92 -12 26 28.5 V T08
2020-12-25 14:37:26 C 11 35 50.01 -12 26 30.2 V T08
2020-12-25 14:44:50 C 11 35 50.18 -12 26 34.5 V T08
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)