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
2021-02-27 17:54:05 S 09 59 57.876 -12 21 00.32 V C57
2021-02-27 18:04:05 S 09 59 55.867 -12 20 44.52 V C57
2021-02-27 18:14:05 S 09 59 53.827 -12 20 29.54 V C57
2021-02-27 18:24:05 S 09 59 51.806 -12 20 15.43 V C57
2021-02-27 18:34:05 S 09 59 49.764 -12 20 00.53 V C57
2021-02-27 18:44:05 S 09 59 47.693 -12 19 45.98 V C57
2021-02-27 18:54:05 S 09 59 45.686 -12 19 31.26 V C57
2021-02-27 19:04:05 S 09 59 43.668 -12 19 15.35 V C57
2021-02-27 19:14:05 S 09 59 41.640 -12 19 00.23 V C57
2021-02-27 19:14:52 C 09 55 12.33 -12 12 53.0 N42
2021-02-27 19:16:10 C 09 55 12.06 -12 12 51.1 N42
2021-02-27 19:18:46 C 09 55 11.50 -12 12 46.5 N42
2021-02-27 19:20:02 C 09 55 11.23 -12 12 44.4 N42
2021-02-27 19:21:20 C 09 55 10.95 -12 12 42.3 N42
2021-02-27 19:23:56 C 09 55 10.43 -12 12 37.8 N42
2021-02-27 19:24:05 S 09 59 39.595 -12 18 45.97 V C57
2021-02-27 19:25:13 C 09 55 10.14 -12 12 35.7 N42
2021-02-27 19:29:05 C 09 55 09.33 -12 12 29.1 N42
2021-02-27 19:32:58 C 09 55 08.49 -12 12 22.7 N42
2021-02-27 19:34:05 S 09 59 37.531 -12 18 31.18 V C57
2021-02-27 19:36:51 C 09 55 07.70 -12 12 16.1 N42
2021-02-27 19:44:05 S 09 59 35.498 -12 18 16.67 V C57
2021-02-27 19:54:05 S 09 59 33.403 -12 18 01.30 V C57
2021-02-27 20:04:05 S 09 59 31.414 -12 17 45.53 V C57
2021-02-27 20:14:05 S 09 59 29.366 -12 17 30.30 V C57
2021-02-27 20:34:05 S 09 59 25.274 -12 17 01.54 V C57
2021-02-27 20:44:05 S 09 59 23.196 -12 16 46.92 V C57
2021-02-27 20:54:05 S 09 59 21.125 -12 16 31.15 V C57
2021-02-27 21:04:05 S 09 59 19.111 -12 16 14.77 V C57
2021-02-27 21:14:05 S 09 59 17.162 -12 16 00.98 V C57
2021-02-27 21:24:05 S 09 59 15.038 -12 15 46.19 V C57
2021-02-27 21:34:05 S 09 59 12.967 -12 15 31.82 V C57
2021-02-27 21:37:22 C 09 54 46.18 -12 08 59.5 V 118
2021-02-27 21:44:01 C 09 54 44.76 -12 08 48.6 V 118
2021-02-27 21:44:05 S 09 59 10.934 -12 15 16.96 V C57
2021-02-27 21:50:39 C 09 54 43.42 -12 08 36.5 V 118
2021-02-27 21:54:05 S 09 59 08.849 -12 15 01.66 V C57
2021-02-27 22:04:05 S 09 59 06.845 -12 14 45.28 V C57
2021-02-27 22:05:00 C 09 54 37.25 -12 08 01.8 V 186
2021-02-27 22:07:05 C 09 54 36.82 -12 07 58.4 V 186
2021-02-27 22:14:05 S 09 59 04.786 -12 14 30.37 V C57
2021-02-27 22:22:53 C 09 54 33.61 -12 07 31.1 V 186
2021-02-27 22:24:05 S 09 59 02.700 -12 14 15.65 V C57
2021-02-27 22:24:56 C 09 54 33.16 -12 07 28.2 V 186
2021-02-27 22:34:05 S 09 59 00.686 -12 14 01.00 V C57
2021-02-27 22:44:05 S 09 58 58.579 -12 13 46.09 V C57
2021-02-27 22:54:05 S 09 58 56.546 -12 13 31.15 V C57
2021-02-27 23:04:05 S 09 58 54.521 -12 13 14.88 V C57
2021-02-27 23:14:05 S 09 58 52.433 -12 12 59.94 V C57
2021-02-27 23:24:05 S 09 58 50.376 -12 12 45.07 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)