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
2013-01-21 11:23:40 C 08 03 04.38 -17 26 40.5 o E23
2013-01-21 11:38:13 C 08 03 01.06 -17 26 14.1 o E23
2013-01-21 11:48:14 C 08 02 58.78 -17 25 55.7 o E23
2013-01-21 11:53:13 C 08 02 57.63 -17 25 46.5 o E23
2013-01-21 11:58:13 C 08 02 56.48 -17 25 37.3 o E23
2013-01-21 12:00:11 C 08 02 56.04 -17 25 33.8 o E23
2013-01-21 12:01:34 C 08 02 51.022 -17 26 48.38 t F65
2013-01-21 12:02:34 C 08 02 50.786 -17 26 46.33 t F65
2013-01-21 12:03:38 C 08 02 50.534 -17 26 44.35 t F65
2013-01-21 12:05:11 C 08 02 54.90 -17 25 24.6 o E23
2013-01-21 12:10:10 C 08 02 53.75 -17 25 15.4 o E23
2013-01-21 12:58:15 C 08 02 45.34 -17 23 42.6 u D20
2013-01-21 12:58:41 C 08 02 45.24 -17 23 41.8 u D20
2013-01-21 12:59:09 C 08 02 45.14 -17 23 41.0 u D20
2013-01-21 13:59:38 C 08 02 31.45 -17 21 51.0 u D20
2013-01-21 14:00:04 C 08 02 31.35 -17 21 50.2 u D20
2013-01-21 14:00:30 C 08 02 31.25 -17 21 49.4 u D20
2013-01-21 14:59:36 C 08 02 17.69 -17 20 00.5 u D20
2013-01-21 15:00:04 C 08 02 17.59 -17 19 59.8 u D20
2013-01-21 15:00:30 C 08 02 17.48 -17 19 58.9 u D20
2013-01-21 15:59:02 C 08 02 03.96 -17 18 09.6 u D20
2013-01-21 15:59:28 C 08 02 03.85 -17 18 08.8 u D20
2013-01-21 15:59:55 C 08 02 03.76 -17 18 08.0 u D20
2013-01-21 16:59:38 C 08 01 49.96 -17 16 14.9 u D20
2013-01-21 17:00:04 C 08 01 49.85 -17 16 14.1 u D20
2013-01-21 17:00:31 C 08 01 49.75 -17 16 13.2 u D20
2013-01-21 17:59:21 C 08 01 36.23 -17 14 20.3 u D20
2013-01-21 17:59:47 C 08 01 36.13 -17 14 19.4 u D20
2013-01-21 18:00:13 C 08 01 36.01 -17 14 18.3 u D20
2013-01-21 18:58:52 C 08 01 22.73 -17 12 24.6 u D20
2013-01-21 18:59:17 C 08 01 22.63 -17 12 23.7 u D20
2013-01-21 18:59:44 C 08 01 22.53 -17 12 22.9 u D20
2013-01-21 19:49:19 C 08 01 17.24 -17 12 29.4 u C40
2013-01-21 19:52:21 C 08 01 16.54 -17 12 23.8 u C40
2013-01-21 19:56:55 C 08 01 15.52 -17 12 15.2 u C40
2013-01-21 19:59:32 C 08 01 09.23 -17 10 25.4 u D20
2013-01-21 19:59:58 C 08 01 09.12 -17 10 24.6 u D20
2013-01-21 19:59:58 C 08 01 14.84 -17 12 09.9 u C40
2013-01-21 20:00:25 C 08 01 09.02 -17 10 23.7 u D20
2013-01-21 20:01:30 C 08 01 14.50 -17 12 06.8 u C40
2013-01-21 20:03:02 C 08 01 14.14 -17 12 03.9 u C40
2013-01-21 20:04:33 C 08 01 13.80 -17 12 01.2 u C40
2013-01-21 20:06:05 C 08 01 13.46 -17 11 58.5 u C40
2013-01-21 20:09:07 C 08 01 12.78 -17 11 52.9 u C40
2013-01-21 20:10:39 C 08 01 12.43 -17 11 50.1 u C40
2013-01-21 20:12:10 C 08 01 12.08 -17 11 47.0 u C40
2013-01-21 20:13:42 C 08 01 11.74 -17 11 44.2 u C40
2013-01-21 20:16:44 C 08 01 11.05 -17 11 38.4 u C40
2013-01-21 20:21:33 C 08 01 09.97 -17 11 29.5 u C40
2013-01-21 21:08:48 C 08 01 02.00 -17 09 53.0 q C27
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)