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
2013-02-13 20:18:13 C 06 50 46.15 -00 03 38.1 q 089
2013-02-13 20:20:17 C 06 50 46.02 -00 03 35.0 q 089
2013-02-13 20:22:21 C 06 50 45.90 -00 03 31.6 q 089
2013-02-13 20:24:25 C 06 50 45.76 -00 03 28.4 q 089
2013-02-13 20:26:30 C 06 50 45.62 -00 03 25.3 q 089
2013-02-13 20:28:37 C 06 50 46.93 -00 03 17.9 w B70
2013-02-13 20:28:48 C 06 50 46.91 -00 03 17.1 r 006
2013-02-13 20:32:26 C 06 50 46.69 -00 03 12.0 r 006
2013-02-13 20:49:34 C 06 50 45.57 -00 02 45.3 r 006
2013-02-14 00:30:07 C 06 50 31.89 +00 02 48.4 u B04
2013-02-14 00:33:29 C 06 50 31.74 +00 02 54.7 u B04
2013-02-14 00:40:26 C 06 50 31.28 +00 03 04.5 u B04
2013-02-14 00:43:52 C 06 50 31.06 +00 03 09.5 u B04
2013-02-14 00:49:54 C 06 50 30.80 +00 03 18.4 u B04
2013-02-14 05:19:25 C 06 50 18.04 +00 10 24.2 q H45
2013-02-14 05:22:03 C 06 50 17.87 +00 10 28.2 q H45
2013-02-14 05:23:13 C 06 50 17.81 +00 10 30.1 q H45
2013-02-14 05:24:00 C 06 50 17.76 +00 10 31.4 q H45
2013-02-14 05:25:37 C 06 50 17.66 +00 10 33.8 q H45
2013-02-14 05:36:42 C 06 50 16.95 +00 10 50.8 q H45
2013-02-14 05:38:44 C 06 50 16.85 +00 10 53.8 q H45
2013-02-14 20:16:45 C 06 49 36.74 +00 33 00.7 a 233
2013-02-14 20:21:51 C 06 49 36.47 +00 33 08.0 a 233
2013-02-14 20:32:22 C 06 49 35.84 +00 33 24.2 a 233
2013-02-14 20:36:42 C 06 49 35.62 +00 33 30.6 a 233
2013-02-14 20:42:57 C 06 49 35.14 +00 33 40.2 a 233
2013-02-14 21:24:00 C 06 49 32.78 +00 34 42.6 i C91
2013-02-14 21:27:00 C 06 49 32.65 +00 34 46.9 i C91
2013-02-14 21:35:00 C 06 49 32.18 +00 34 58.8 i C91
2013-02-14 21:40:59 C 06 49 31.87 +00 35 08.5 i C91
2013-02-15 18:49:32 C 06 48 39.12 +01 06 38.7 q C27
2013-02-15 19:15:14 C 06 48 37.78 +01 07 16.7 q C27
2013-02-15 19:40:41 C 06 48 36.43 +01 07 54.2 q C27
2013-02-15 19:55:44 C 06 48 35.59 +01 08 15.0 c A05
2013-02-15 20:06:36 C 06 48 35.01 +01 08 31.1 c A05
2013-02-15 20:10:54 C 06 48 34.79 +01 08 37.3 c A05
2013-02-15 20:21:04 C 06 48 34.24 +01 08 52.3 c A05
2013-02-16 03:43:37 C 06 48 15.66 +01 19 46.4 q H45
2013-02-16 03:50:23 C 06 48 15.32 +01 19 56.4 q H45
2013-02-16 03:57:57 C 06 48 14.91 +01 20 07.4 q H45
2013-02-16 20:23:50 C 06 47 36.83 +01 43 37.1 168
2013-02-16 20:25:50 C 06 47 36.78 +01 43 38.8 168
2013-02-17 18:43:25 C 06 46 52.76 +02 15 10.6 168
2013-02-17 18:46:16 C 06 46 52.60 +02 15 14.7 168
2013-02-18 03:20:02 C 06 46 37.79 +02 27 24.3 q H45
2013-02-18 03:22:07 C 06 46 37.68 +02 27 27.3 q H45
2013-02-18 03:23:57 C 06 46 37.60 +02 27 29.9 q H45
2013-02-18 03:24:53 C 06 46 37.55 +02 27 31.2 q H45
2013-02-18 03:26:15 C 06 46 37.50 +02 27 33.1 q H45
2013-02-18 03:27:46 C 06 46 37.43 +02 27 35.1 q H45
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)