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
2013-03-08 03:33:20 C 06 48 33.36 +10 19 14.4 q H45
2013-03-08 03:35:10 C 06 48 33.40 +10 19 15.7 q H45
2013-03-08 03:36:52 C 06 48 33.44 +10 19 17.1 q H45
2013-03-08 03:38:43 C 06 48 33.50 +10 19 18.8 q H45
2013-03-08 07:03:27 C 06 48 40.362 +10 22 21.06 t F65
2013-03-08 07:06:06 C 06 48 40.416 +10 22 23.28 t F65
2013-03-10 19:20:39 C 06 50 46.81 +11 10 53.2 c A24
2013-03-10 19:22:43 C 06 50 46.89 +11 10 55.1 c A24
2013-03-10 19:41:25 C 06 50 47.44 +11 11 09.4 c A24
2013-03-10 20:03:23 C 06 50 48.09 +11 11 26.7 c A24
2013-03-10 20:21:23 C 06 50 48.62 +11 11 40.5 c A24
2013-03-10 20:23:15 C 06 50 48.13 +11 11 43.4 o 071
2013-03-10 20:23:28 C 06 50 48.69 +11 11 42.2 c A24
2013-03-10 20:26:17 C 06 50 48.21 +11 11 45.8 o 071
2013-03-10 20:29:17 C 06 50 48.32 +11 11 48.2 o 071
2013-03-10 20:32:20 C 06 50 48.39 +11 11 50.3 o 071
2013-03-10 20:35:20 C 06 50 48.50 +11 11 52.9 o 071
2013-03-12 22:36:29 C 06 52 48.24 +11 49 43.2 o 071
2013-03-12 22:39:43 C 06 52 48.37 +11 49 45.4 o 071
2013-03-12 22:46:17 C 06 52 48.62 +11 49 50.6 o 071
2013-03-12 22:49:28 C 06 52 48.77 +11 49 53.2 o 071
2013-03-12 22:55:51 C 06 52 48.97 +11 49 56.7 o 071
2013-03-12 23:02:17 C 06 52 49.30 +11 50 02.1 o 071
2013-03-13 18:35:36 C 06 53 41.38 +12 04 18.3 o 071
2013-03-13 18:38:49 C 06 53 41.55 +12 04 20.9 o 071
2013-03-13 18:42:00 C 06 53 41.68 +12 04 22.3 o 071
2013-03-13 18:45:20 C 06 53 41.79 +12 04 24.9 o 071
2013-03-13 18:48:35 C 06 53 41.89 +12 04 27.3 o 071
2013-03-13 18:55:03 C 06 53 42.13 +12 04 31.7 o 071
2013-03-13 18:58:14 C 06 53 42.25 +12 04 34.4 o 071
2013-03-13 19:11:15 C 06 53 42.74 +12 04 44.3 o 071
2013-03-13 19:14:26 C 06 53 42.86 +12 04 46.2 o 071
2013-03-13 19:17:37 C 06 53 42.96 +12 04 48.1 o 071
2013-03-13 19:20:48 C 06 53 43.18 +12 04 50.7 o 071
2013-03-13 19:23:59 C 06 53 43.22 +12 04 52.6 o 071
2013-03-13 19:40:40 C 06 53 43.79 +12 05 04.5 o 071
2013-03-13 19:53:15 C 06 53 44.26 +12 05 13.3 o 071
2013-03-13 19:56:27 C 06 53 44.38 +12 05 15.5 o 071
2013-03-13 19:59:38 C 06 53 44.49 +12 05 18.0 o 071
2013-03-13 20:02:49 C 06 53 44.57 +12 05 19.3 o 071
2013-03-13 20:06:00 C 06 53 44.73 +12 05 22.2 o 071
2013-03-13 20:07:20 C 06 53 44.49 +12 05 12.9 r 168
2013-03-14 06:30:43 C 06 54 11.59 +12 12 47.2 q H45
2013-03-14 06:32:16 C 06 54 11.71 +12 12 48.0 q H45
2013-03-14 06:34:29 C 06 54 11.79 +12 12 49.5 q H45
2013-03-14 06:36:20 C 06 54 11.86 +12 12 51.2 q H45
2013-03-14 06:38:12 C 06 54 11.97 +12 12 52.1 q H45
2013-03-14 06:39:28 C 06 54 11.99 +12 12 53.1 q H45
2013-03-14 17:21:35 C 06 54 42.52 +12 20 17.6 r 168
2013-03-14 18:43:40 C 06 54 45.92 +12 21 13.3 r 168
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)