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
2012-12-25 03:59:36 C 10 33 09.72 -27 24 44.3 o 071
2012-12-25 04:04:29 C 10 33 08.69 -27 24 44.0 o 071
2012-12-25 04:08:04 C 10 33 07.91 -27 24 43.9 o 071
2012-12-25 04:10:24 C 10 33 07.39 -27 24 43.8 o 071
2012-12-25 04:12:45 C 10 33 06.90 -27 24 43.7 o 071
2012-12-25 04:17:29 C 10 33 05.87 -27 24 43.3 o 071
2012-12-25 04:19:50 C 10 33 05.33 -27 24 43.3 o 071
2012-12-25 04:22:11 C 10 33 04.86 -27 24 43.0 o 071
2012-12-25 04:24:33 C 10 33 04.34 -27 24 43.1 o 071
2012-12-25 04:26:54 C 10 33 03.82 -27 24 42.8 o 071
2012-12-25 04:29:15 C 10 33 03.29 -27 24 42.7 o 071
2012-12-25 19:27:45 C 10 30 08.67 -27 23 05.0 t D20
2012-12-25 19:28:26 C 10 30 08.52 -27 23 05.1 t D20
2012-12-25 19:29:06 C 10 30 08.38 -27 23 05.1 t D20
2012-12-25 19:30:50 C 10 30 07.99 -27 23 05.1 t D20
2012-12-25 19:31:31 C 10 30 07.83 -27 23 05.1 t D20
2012-12-25 19:32:14 C 10 30 07.68 -27 23 05.1 t D20
2012-12-26 19:18:59 C 10 25 20.39 -27 21 54.8 t D20
2012-12-26 19:19:42 C 10 25 20.24 -27 21 54.8 t D20
2012-12-26 19:20:21 C 10 25 20.09 -27 21 54.7 t D20
2012-12-26 19:22:11 C 10 25 19.67 -27 21 54.6 t D20
2012-12-26 19:29:47 C 10 25 17.95 -27 21 54.5 t D20
2012-12-26 19:30:30 C 10 25 17.77 -27 21 54.5 t D20
2012-12-26 19:31:11 C 10 25 17.63 -27 21 54.3 t D20
2012-12-27 11:08:13 C 10 22 04.71 -27 21 56.2 c H06
2012-12-27 11:11:20 C 10 22 04.00 -27 21 55.9 c H06
2012-12-27 11:14:25 C 10 22 03.26 -27 21 55.5 c H06
2012-12-27 11:17:33 C 10 22 02.58 -27 21 55.1 c H06
2012-12-28 01:32:01 C 10 19 07.03 -27 20 21.4 o 071
2012-12-28 01:50:39 C 10 19 02.81 -27 20 18.7 o 071
2012-12-28 01:59:39 C 10 19 00.65 -27 20 17.7 o 071
2012-12-28 02:02:02 C 10 19 00.30 -27 20 17.9 o 071
2012-12-28 02:04:24 C 10 18 59.58 -27 20 17.3 o 071
2012-12-28 02:06:46 C 10 18 59.21 -27 20 16.8 o 071
2012-12-28 02:09:10 C 10 18 58.50 -27 20 17.3 o 071
2012-12-28 02:13:16 C 10 18 57.67 -27 20 16.7 o 071
2012-12-28 02:26:02 C 10 18 54.70 -27 20 14.5 o 071
2012-12-28 02:30:27 C 10 18 53.65 -27 20 13.7 o 071
2012-12-28 02:37:15 C 10 18 52.02 -27 20 13.2 o 071
2012-12-28 02:45:05 C 10 18 50.25 -27 20 11.2 o 071
2012-12-28 02:48:27 C 10 18 49.62 -27 20 10.4 o 071
2012-12-28 02:55:11 C 10 18 48.00 -27 20 09.6 o 071
2012-12-28 02:58:32 C 10 18 47.20 -27 20 10.0 o 071
2012-12-28 03:03:43 C 10 18 46.06 -27 20 08.9 o 071
2012-12-28 03:07:05 C 10 18 45.35 -27 20 08.5 o 071
2012-12-28 03:10:27 C 10 18 44.46 -27 20 07.4 o 071
2012-12-28 03:31:58 C 10 18 39.51 -27 20 04.3 o 071
2012-12-28 03:38:43 C 10 18 37.89 -27 20 03.2 o 071
2012-12-29 01:47:08 C 10 14 02.07 -27 16 33.7 v 470
2012-12-29 01:49:14 C 10 14 01.58 -27 16 33.5 v 470
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)