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
2013-02-24 03:20:33 C 06 44 16.09 +05 31 15.1 q H45
2013-02-24 03:24:47 C 06 44 16.05 +05 31 20.4 q H45
2013-02-24 03:28:33 C 06 44 15.99 +05 31 24.4 q H45
2013-02-24 03:43:25 C 06 44 15.56 +05 31 38.9 u H21
2013-02-24 03:48:12 C 06 44 15.49 +05 31 44.5 u H21
2013-02-24 03:58:36 C 06 44 15.36 +05 31 56.6 u H21
2013-02-25 03:10:29 C 06 44 12.50 +05 58 48.5 r H21
2013-02-25 03:18:34 C 06 44 12.41 +05 58 57.7 r H21
2013-02-25 03:28:26 C 06 44 12.30 +05 59 09.0 r H21
2013-02-25 13:02:02 C 06 44 13.670 +06 10 10.33 q O44
2013-02-25 13:04:18 C 06 44 13.644 +06 10 12.92 q O44
2013-02-25 13:06:32 C 06 44 13.617 +06 10 15.43 q O44
2013-02-25 13:08:48 C 06 44 13.590 +06 10 18.00 q O44
2013-02-25 13:11:02 C 06 44 13.563 +06 10 20.58 q O44
2013-02-25 13:13:18 C 06 44 13.536 +06 10 23.11 q O44
2013-02-25 13:15:34 C 06 44 13.509 +06 10 25.65 q O44
2013-02-25 13:17:48 C 06 44 13.483 +06 10 28.20 q O44
2013-02-25 13:20:04 C 06 44 13.456 +06 10 30.75 q O44
2013-02-25 13:22:20 C 06 44 13.428 +06 10 33.31 q O44
2013-02-25 13:24:34 C 06 44 13.404 +06 10 35.88 q O44
2013-02-25 13:26:51 C 06 44 13.375 +06 10 38.41 q O44
2013-02-25 13:29:06 C 06 44 13.349 +06 10 40.97 q O44
2013-02-25 13:31:21 C 06 44 13.322 +06 10 43.50 q O44
2013-02-26 12:10:42 C 06 44 17.676 +06 35 57.96 q O44
2013-02-26 12:12:56 C 06 44 17.658 +06 36 00.43 q O44
2013-02-26 12:15:12 C 06 44 17.641 +06 36 02.94 q O44
2013-02-26 12:17:28 C 06 44 17.624 +06 36 05.42 q O44
2013-02-26 12:19:44 C 06 44 17.606 +06 36 07.98 q O44
2013-02-26 12:22:02 C 06 44 17.589 +06 36 10.48 q O44
2013-02-26 12:24:16 C 06 44 17.572 +06 36 12.97 q O44
2013-02-26 12:26:33 C 06 44 17.554 +06 36 15.47 q O44
2013-02-26 12:28:47 C 06 44 17.536 +06 36 17.97 q O44
2013-02-26 12:31:03 C 06 44 17.517 +06 36 20.49 q O44
2013-02-26 12:33:19 C 06 44 17.500 +06 36 22.99 q O44
2013-02-26 12:35:35 C 06 44 17.482 +06 36 25.51 q O44
2013-02-26 12:37:51 C 06 44 17.465 +06 36 28.01 q O44
2013-02-26 17:34:46 C 06 44 18.38 +06 41 39.3 u 089
2013-02-26 17:37:25 C 06 44 18.37 +06 41 41.9 u 089
2013-02-26 17:40:04 C 06 44 18.35 +06 41 45.0 u 089
2013-02-26 17:42:43 C 06 44 18.36 +06 41 48.0 u 089
2013-02-26 17:45:22 C 06 44 18.35 +06 41 50.7 u 089
2013-02-26 17:48:01 C 06 44 18.32 +06 41 53.7 u 089
2013-02-26 17:50:40 C 06 44 18.30 +06 41 56.5 u 089
2013-02-26 17:53:19 C 06 44 18.30 +06 41 59.6 u 089
2013-02-26 17:55:58 C 06 44 18.28 +06 42 02.2 u 089
2013-02-26 17:58:37 C 06 44 18.27 +06 42 05.2 u 089
2013-02-26 18:01:16 C 06 44 18.27 +06 42 08.0 u 089
2013-02-26 18:03:55 C 06 44 18.26 +06 42 11.1 u 089
2013-02-26 18:06:34 C 06 44 18.24 +06 42 14.0 u 089
2013-02-26 18:09:13 C 06 44 18.23 +06 42 16.9 u 089
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)