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
2005-02-22 01:27:09 C 05 09 46.03 +11 15 37.0 r H45
2005-02-23 05:21:46 C 05 12 47.13 +11 35 23.7 o F65
2005-02-23 06:10:37 C 05 12 51.99 +11 35 57.5 o F65
2005-02-23 06:48:48 C 05 12 55.79 +11 36 23.5 o F65
2005-02-25 01:13:14 C 05 17 30.53 +12 04 57.5 r H36
2005-02-25 01:35:43 C 05 17 32.83 +12 05 13.8 r H36
2005-02-25 04:01:35 C 05 17 47.59 +12 06 47.8 r 649
2005-02-25 04:14:23 C 05 17 48.86 +12 06 56.8 r 649
2005-02-25 04:16:56 C 05 17 49.16 +12 06 58.3 r 649
2005-02-25 18:25:50 C 05 19 21.39 +12 16 10.7 o 198
2005-02-25 18:32:12 C 05 19 22.04 +12 16 14.7 o 198
2005-02-25 18:38:19 C 05 19 22.67 +12 16 18.3 o 198
2005-02-25 18:46:47 C 05 19 23.53 +12 16 23.5 o 198
2005-02-25 18:47:33 C 05 19 23.61 +12 16 24.0 o 198
2005-02-27 19:44:00 C 05 24 38.45 +12 47 22.6 r J95
2005-02-27 20:00:38 C 05 24 40.14 +12 47 32.8 r J95
2005-02-27 20:13:43 C 05 24 41.46 +12 47 40.4 r J95
2005-02-28 19:09:27 C 05 27 08.65 +13 01 32.9 c A83
2005-02-28 19:12:10 C 05 27 08.90 +13 01 36.1 c A83
2005-02-28 19:14:55 C 05 27 09.21 +13 01 35.9 c A83
2005-02-28 19:21:50 C 05 27 10.00 +13 01 41.6 c A83
2005-02-28 19:44:26 C 05 27 12.34 +13 01 55.5 c A83
2005-02-28 19:48:10 C 05 27 12.64 +13 01 56.5 c A83
2005-03-02 02:21:33 C 05 30 28.76 +13 20 10.1 r H45
2005-03-02 02:24:17 C 05 30 29.04 +13 20 12.9 r H45
2005-03-02 02:28:37 C 05 30 29.49 +13 20 15.3 r H45
2005-03-02 02:32:02 C 05 30 29.82 +13 20 17.0 r H45
2005-03-02 19:46:53 C 05 32 20.60 +13 30 07.5 r 240
2005-03-02 19:51:48 C 05 32 21.09 +13 30 10.1 r 240
2005-03-02 19:56:42 C 05 32 21.58 +13 30 12.8 r 240
2005-03-02 20:01:38 C 05 32 22.08 +13 30 15.4 r 240
2005-03-02 20:05:34 C 05 32 22.47 +13 30 17.6 r 240
2005-03-02 20:11:28 C 05 32 23.09 +13 30 21.1 r 240
2005-03-02 20:16:22 C 05 32 23.60 +13 30 24.0 r 240
2005-03-04 19:58:31 C 05 37 29.64 +13 56 56.9 r 941
2005-03-04 19:59:11 C 05 37 29.70 +13 56 57.2 r 941
2005-03-04 19:59:51 C 05 37 29.76 +13 56 57.5 r 941
2005-03-04 20:00:30 C 05 37 29.82 +13 56 57.8 r 941
2005-03-04 20:01:50 C 05 37 29.95 +13 56 58.4 r 941
2005-03-26 20:04:51 C 06 34 28.23 +17 26 17.3 r 941
2005-03-26 20:06:00 C 06 34 28.35 +17 26 17.5 r 941
2005-03-26 20:08:10 C 06 34 28.58 +17 26 18.0 r 941
2005-03-26 20:12:12 C 06 34 29.00 +17 26 19.0 r 941
2005-04-06 04:22:48 C 07 01 37.80 +18 18 34.3 o 696
2005-04-06 04:25:33 C 07 01 38.16 +18 18 35.6 o 696
2005-04-08 02:34:47 C 07 06 43.08 +18 25 26.4 r 734
2005-04-08 02:44:23 C 07 06 44.12 +18 25 26.7 r 734
2005-04-08 02:54:02 C 07 06 45.12 +18 25 28.7 r 734
2005-04-28 20:03:21 C 08 01 41.01 +18 48 51.5 r 941
2005-04-28 20:04:31 C 08 01 41.14 +18 48 51.4 r 941
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)