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
2021-04-23 19:56:49 C 07 59 36.71 +20 42 11.7 V 160
2021-04-23 20:04:17 C 07 59 36.48 +20 42 18.9 V 160
2021-04-23 20:11:19 C 07 59 36.32 +20 42 24.7 V 160
2021-04-24 03:32:11 C 07 59 31.61 +20 49 02.4 V 703
2021-04-24 03:39:34 C 07 59 31.46 +20 49 08.2 V 703
2021-04-24 03:46:56 C 07 59 31.29 +20 49 14.2 V 703
2021-04-24 03:54:19 C 07 59 31.11 +20 49 20.5 V 703
2021-04-24 03:56:33 C 07 59 31.10 +20 49 23.3 o 691
2021-04-24 04:04:16 C 07 59 30.94 +20 49 29.7 o 691
2021-04-24 04:15:48 C 07 59 30.69 +20 49 39.3 o 691
2021-04-24 19:42:49 C 07 59 20.84 +21 02 57.6 q 160
2021-04-24 19:48:41 C 07 59 20.77 +21 03 02.9 q 160
2021-04-24 20:46:04 C 07 59 20.28 +21 03 46.5 V Z80
2021-04-24 20:56:04 C 07 59 20.10 +21 03 54.7 V Z80
2021-04-24 21:06:24 C 07 59 19.85 +21 04 03.4 V Z80
2021-04-25 07:09:15 C 07 59 12.24 +21 13 14.6 V T08
2021-04-25 07:15:14 C 07 59 12.15 +21 13 19.1 V T08
2021-04-25 07:23:11 C 07 59 11.96 +21 13 25.6 V T08
2021-04-25 07:41:08 C 07 59 11.58 +21 13 39.9 V T08
2021-04-30 20:12:57 C 07 57 23.11 +23 06 28.0 o 069
2021-04-30 20:18:16 C 07 57 23.00 +23 06 32.0 o 069
2021-04-30 20:23:15 C 07 57 22.96 +23 06 35.9 o 069
2021-04-30 21:17:11 C 07 57 21.89 +23 07 27.0 V Z80
2021-04-30 21:25:56 C 07 57 21.75 +23 07 33.9 V Z80
2021-05-02 21:06:11 C 07 56 28.98 +23 47 57.9 V Z80
2021-05-02 21:23:49 C 07 56 28.45 +23 48 12.6 V Z80
2021-05-06 03:00:45 S 07 54 39.729 +24 54 25.94 X 275
2021-05-06 04:21:10 C 07 54 36.77 +24 55 28.9 V 703
2021-05-06 04:39:09 C 07 54 36.17 +24 55 42.4 V 703
2021-05-06 04:47:24 C 07 54 35.88 +24 55 49.1 V 703
2021-05-06 04:50:07 C 07 54 35.83 +24 55 52.3 o 691
2021-05-06 04:52:21 C 07 54 35.77 +24 55 54.2 o 691
2021-05-06 04:54:35 C 07 54 35.70 +24 55 56.0 o 691
2021-05-06 04:55:38 C 07 54 35.63 +24 55 55.8 V 703
2021-05-11 06:03:22 C 07 50 29.16 +26 40 17.7 V T08
2021-05-11 06:08:04 C 07 50 28.92 +26 40 21.6 V T08
2021-05-11 06:20:00 C 07 50 28.29 +26 40 30.5 V T08
2021-05-11 06:34:37 C 07 50 27.54 +26 40 42.1 V T08
2021-05-12 03:34:56 C 07 49 33.08 +26 58 48.6 o 691
2021-05-12 03:37:10 C 07 49 32.97 +26 58 50.5 o 691
2021-05-12 03:39:26 C 07 49 32.86 +26 58 52.5 o 691
2021-05-12 06:13:40 C 07 49 25.844 +27 01 17.66 U F51
2021-05-12 06:21:08 C 07 49 25.431 +27 01 23.60 U F51
2021-05-12 06:28:35 C 07 49 25.020 +27 01 29.49 U F51
2021-05-20 18:48:48 C 07 36 17.55 +30 01 54.9 t B18
2021-05-20 18:59:26 C 07 36 16.65 +30 02 05.2 t B18
2022-04-09 08:41:13 S 21 02 38.328 -14 07 51.34 X 275
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)