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
2021-03-10 17:43:04 C 09 06 59.70 -03 50 51.2 q M44
2021-03-10 17:59:20 C 09 06 56.72 -03 50 17.3 q M44
2021-03-10 18:36:11 C 09 06 52.29 -03 49 28.0 Y 557
2021-03-10 18:50:30 C 09 06 50.45 -03 48 53.9 V K19
2021-03-10 18:55:52 C 09 06 49.50 -03 48 42.8 V K19
2021-03-10 19:00:52 C 09 06 48.11 -03 48 30.0 q K73
2021-03-10 19:02:14 C 09 06 47.96 -03 48 28.3 q L47
2021-03-10 19:06:35 C 09 06 47.09 -03 48 18.3 q K73
2021-03-10 19:12:00 C 09 06 46.07 -03 48 07.8 q K73
2021-03-10 19:13:48 C 09 06 45.89 -03 48 07.1 q L47
2021-03-10 19:26:59 C 09 06 43.32 -03 47 44.5 V C47
2021-03-10 19:30:48 C 09 06 42.89 -03 47 31.0 q L47
2021-03-10 19:31:30 C 09 06 43.35 -03 47 29.0 V C35
2021-03-10 19:31:48 C 09 06 41.79 -03 47 39.6 u 152
2021-03-10 19:32:33 C 09 06 41.64 -03 47 37.7 u 152
2021-03-10 19:33:21 C 09 06 41.50 -03 47 36.1 u 152
2021-03-10 19:34:07 C 09 06 41.38 -03 47 35.0 u 152
2021-03-10 19:34:45 C 09 06 41.95 -03 47 29.4 Y 557
2021-03-10 19:34:54 C 09 06 41.25 -03 47 33.8 u 152
2021-03-10 19:35:41 C 09 06 41.11 -03 47 31.8 u 152
2021-03-10 19:35:43 C 09 06 42.70 -03 47 20.3 V C35
2021-03-10 19:37:37 C 09 06 41.43 -03 47 22.8 V C47
2021-03-10 19:48:14 C 09 06 39.55 -03 47 01.2 V C47
2021-03-10 19:48:48 C 09 06 38.79 -03 47 05.2 u 152
2021-03-10 19:50:59 C 09 06 38.40 -03 47 00.6 u 152
2021-03-10 19:52:40 C 09 06 38.10 -03 46 57.1 u 152
2021-03-10 19:54:19 C 09 06 37.82 -03 46 53.6 u 152
2021-03-10 20:03:57 C 09 06 36.11 -03 46 34.4 u 152
2021-03-10 20:05:24 C 09 06 35.86 -03 46 31.3 u 152
2021-03-10 20:09:29 C 09 06 35.76 -03 46 18.2 V C47
2021-03-10 20:20:30 C 09 06 33.20 -03 46 00.7 u 152
2021-03-10 20:21:02 C 09 06 33.41 -03 45 55.2 q 056
2021-03-10 20:24:37 C 09 06 32.48 -03 45 52.5 u 152
2021-03-10 20:26:15 C 09 06 32.48 -03 45 44.8 q 056
2021-03-10 20:31:31 C 09 06 31.53 -03 45 33.7 q 056
2021-03-10 20:33:19 C 09 06 31.55 -03 45 30.8 Y 557
2021-03-10 20:36:46 C 09 06 30.60 -03 45 23.4 q 056
2021-03-10 20:51:58 C 09 06 28.20 -03 44 51.9 V C47
2021-03-10 20:57:46 C 09 06 26.85 -03 44 40.2 q 056
2021-03-10 21:03:00 C 09 06 25.93 -03 44 29.8 q 056
2021-03-10 21:08:15 C 09 06 24.98 -03 44 18.8 q 056
2021-03-10 21:13:16 C 09 06 24.64 -03 44 04.9 V 160
2021-03-10 21:20:44 C 09 06 23.29 -03 43 49.5 V 160
2021-03-10 21:28:13 C 09 06 21.96 -03 43 33.9 V 160
2021-03-10 21:28:23 C 09 06 22.87 -03 43 28.6 V I79
2021-03-10 21:29:47 C 09 06 21.51 -03 43 36.2 Y 557
2021-03-10 21:33:52 C 09 06 21.86 -03 43 17.5 V I79
2021-03-10 21:39:22 C 09 06 20.90 -03 43 06.6 V I79
2021-03-10 21:50:16 C 09 06 18.88 -03 42 43.8 V I79
2021-03-10 21:52:22 C 09 06 17.66 -03 42 45.2 V L63
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)