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
2021-03-04 05:58:52 C 09 34 38.34 -09 01 15.7 V I22
2021-03-04 05:59:22 C 09 34 38.28 -09 01 14.5 V I22
2021-03-04 05:59:53 C 09 34 38.13 -09 01 13.4 V I22
2021-03-04 06:00:24 C 09 34 38.05 -09 01 12.4 V I22
2021-03-04 06:00:53 C 09 34 37.94 -09 01 11.6 V I22
2021-03-04 06:01:23 C 09 34 37.84 -09 01 10.9 V I22
2021-03-04 06:01:54 C 09 34 37.78 -09 01 09.5 V I22
2021-03-04 06:02:34 C 09 34 37.60 -09 01 08.3 V I22
2021-03-04 06:03:04 C 09 34 37.49 -09 01 07.6 V I22
2021-03-04 06:03:36 C 09 34 37.41 -09 01 06.4 V I22
2021-03-04 06:04:05 S 09 35 43.308 -09 16 25.82 V C57
2021-03-04 06:04:05 s 1 -187015.92 6 +231136.76 3700.0 C57
2021-03-04 06:04:13 C 09 34 37.28 -09 01 05.7 V I22
2021-03-04 06:04:41 C 09 34 37.19 -09 01 04.5 V I22
2021-03-04 06:05:11 C 09 34 37.08 -09 01 03.3 V I22
2021-03-04 06:05:54 C 09 34 36.95 -09 01 02.1 V I22
2021-03-04 06:06:23 C 09 34 36.85 -09 01 01.0 V I22
2021-03-04 06:06:53 C 09 34 36.75 -09 01 00.1 V I22
2021-03-04 06:07:35 C 09 34 36.61 -09 00 58.8 V I22
2021-03-04 06:08:04 C 09 34 36.53 -09 00 57.7 V I22
2021-03-04 06:08:34 C 09 34 36.43 -09 00 56.5 V I22
2021-03-04 06:08:44 C 09 34 36.375 -09 00 56.30 V I22
2021-03-04 06:09:06 C 09 34 36.31 -09 00 56.1 V I22
2021-03-04 06:09:36 C 09 34 36.20 -09 00 55.0 V I22
2021-03-04 06:10:07 C 09 34 36.11 -09 00 53.8 V I22
2021-03-04 06:10:35 C 09 34 36.05 -09 00 52.9 V I22
2021-03-04 06:11:06 C 09 34 35.92 -09 00 52.1 V I22
2021-03-04 06:11:36 C 09 34 35.81 -09 00 51.0 V I22
2021-03-04 06:12:05 C 09 34 35.71 -09 00 49.9 V I22
2021-03-04 06:12:35 C 09 34 35.60 -09 00 49.1 V I22
2021-03-04 06:13:05 C 09 34 35.50 -09 00 48.1 V I22
2021-03-04 06:13:34 C 09 34 35.45 -09 00 47.6 V I22
2021-03-04 06:13:50 C 09 34 35.355 -09 00 46.57 V I22
2021-03-04 06:14:04 C 09 34 35.32 -09 00 46.3 V I22
2021-03-04 06:14:05 S 09 35 40.886 -09 16 06.67 V C57
2021-03-04 06:14:05 s 1 -187153.72 7 +230568.24 8100.0 C57
2021-03-04 06:14:35 C 09 34 35.22 -09 00 45.3 V I22
2021-03-04 06:15:04 C 09 34 35.11 -09 00 44.3 V I22
2021-03-04 06:15:34 C 09 34 35.01 -09 00 43.7 V I22
2021-03-04 06:16:36 C 09 34 34.82 -09 00 41.5 V I22
2021-03-04 06:17:05 C 09 34 34.70 -09 00 40.5 V I22
2021-03-04 06:17:35 C 09 34 34.61 -09 00 39.4 V I22
2021-03-04 06:18:06 C 09 34 34.51 -09 00 38.3 V I22
2021-03-04 06:18:51 C 09 34 34.366 -09 00 36.80 V I22
2021-03-04 06:19:07 C 09 34 34.32 -09 00 36.4 V I22
2021-03-04 06:19:36 C 09 34 34.21 -09 00 35.7 V I22
2021-03-04 06:20:07 C 09 34 34.11 -09 00 34.8 V I22
2021-03-04 06:20:37 C 09 34 34.02 -09 00 33.7 V I22
2021-03-04 06:21:06 C 09 34 33.91 -09 00 32.5 V I22
2021-03-04 06:24:05 S 09 35 38.558 -09 15 46.69 V C57
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)