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
2013-02-18 12:06:37 C 06 46 24.590 +02 39 36.17 q O44
2013-02-18 12:35:46 C 06 46 23.411 +02 40 16.13 q O44
2013-02-18 12:38:01 C 06 46 23.316 +02 40 19.38 q O44
2013-02-18 12:42:33 C 06 46 23.130 +02 40 25.44 q O44
2013-02-18 12:44:47 C 06 46 23.036 +02 40 28.55 q O44
2013-02-18 18:29:09 C 06 46 11.66 +02 47 56.5 r 168
2013-02-18 18:30:15 C 06 46 11.61 +02 47 57.8 r 168
2013-02-18 18:31:21 C 06 46 11.60 +02 47 58.9 r 168
2013-02-18 18:36:50 C 06 46 11.39 +02 48 07.6 r 168
2013-02-18 18:43:30 C 06 46 11.18 +02 48 15.9 r 168
2013-02-18 18:52:01 C 06 46 10.87 +02 48 27.7 r 168
2013-02-18 18:52:03 C 06 46 10.87 +02 48 27.1 r 168
2013-02-18 18:55:53 C 06 46 10.75 +02 48 32.6 r 168
2013-02-18 19:02:55 C 06 46 10.48 +02 48 42.3 r 168
2013-02-18 19:02:57 C 06 46 10.51 +02 48 42.0 r 168
2013-02-18 19:06:48 C 06 46 10.38 +02 48 47.4 r 168
2013-02-18 19:19:22 C 06 46 11.80 +02 49 13.1 q B88
2013-02-18 19:32:13 C 06 46 11.31 +02 49 30.6 q B88
2013-02-18 19:45:01 C 06 46 10.82 +02 49 47.9 q B88
2013-02-18 19:55:49 C 06 46 10.33 +02 50 02.7 a 233
2013-02-18 19:57:46 C 06 46 08.70 +02 49 56.6 r 168
2013-02-18 19:59:07 C 06 46 08.65 +02 49 58.4 r 168
2013-02-18 20:00:13 C 06 46 08.62 +02 49 59.4 r 168
2013-02-18 20:02:09 C 06 46 10.09 +02 50 11.5 a 233
2013-02-18 20:02:38 C 06 46 08.53 +02 50 03.1 r 168
2013-02-18 20:09:37 C 06 46 09.83 +02 50 21.5 a 233
2013-02-18 20:15:00 C 06 46 09.58 +02 50 28.7 i C91
2013-02-18 20:19:59 C 06 46 09.41 +02 50 35.3 i C91
2013-02-18 20:21:31 C 06 46 09.38 +02 50 37.8 a 233
2013-02-18 20:41:00 C 06 46 08.59 +02 51 04.1 i C91
2013-02-19 05:21:13 C 06 45 54.13 +03 02 52.7 q H45
2013-02-19 05:22:35 C 06 45 54.07 +03 02 54.5 q H45
2013-02-19 05:23:46 C 06 45 54.04 +03 02 56.2 q H45
2013-02-19 05:26:00 C 06 45 53.97 +03 02 59.1 q H45
2013-02-19 05:27:50 C 06 45 53.91 +03 03 01.6 q H45
2013-02-19 05:29:26 C 06 45 53.85 +03 03 03.7 q H45
2013-02-19 05:30:37 C 06 45 53.80 +03 03 05.4 q H45
2013-02-19 05:31:56 C 06 45 53.76 +03 03 07.1 q H45
2013-02-19 20:08:30 C 06 45 35.79 +03 22 30.0 d 586
2013-02-19 20:39:14 C 06 45 34.78 +03 23 10.5 d 586
2013-02-19 21:09:57 C 06 45 33.75 +03 23 51.5 d 586
2013-02-20 15:26:45 C 06 45 12.86 +03 47 35.5 168
2013-02-20 15:34:45 C 06 45 12.65 +03 47 46.3 168
2013-02-20 16:23:05 C 06 45 11.40 +03 48 48.1 168
2013-02-20 17:20:05 C 06 45 09.87 +03 50 02.0 168
2013-02-20 17:21:21 C 06 45 09.87 +03 50 03.7 168
2013-02-20 17:22:35 C 06 45 09.85 +03 50 05.3 168
2013-02-24 03:12:25 C 06 44 16.25 +05 31 06.3 q H45
2013-02-24 03:15:48 C 06 44 16.23 +05 31 10.3 q H45
2013-02-24 03:19:02 C 06 44 16.13 +05 31 13.5 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)