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
2013-05-27 06:15:22 C 08 59 49.263 +21 07 58.05 t F65
2014-01-13 08:00:25 C 13 47 54.71 -16 10 31.6 u 807
2014-01-13 08:10:16 C 13 47 55.98 -16 10 38.5 u 807
2014-01-13 08:20:23 C 13 47 57.29 -16 10 45.6 u 807
2014-02-26 15:13:08 C 16 39 50.048 -24 59 30.71 L F51
2014-02-26 15:19:10 C 16 39 51.234 -24 59 31.95 L F51
2014-02-26 15:25:12 C 16 39 52.428 -24 59 33.02 L F51
2014-02-26 15:31:14 C 16 39 53.624 -24 59 33.85 L F51
2015-01-03 05:37:07 C 14 43 01.20 -17 27 36.8 q 586
2015-01-03 05:46:16 C 14 43 02.63 -17 27 42.2 q 586
2015-01-03 05:53:57 C 14 43 03.82 -17 27 47.1 q 586
2015-01-03 06:02:52 C 14 43 05.22 -17 27 52.9 q 586
2015-01-03 06:11:09 C 14 43 06.52 -17 27 58.2 q 586
2015-01-03 06:18:50 C 14 43 07.72 -17 28 03.2 q 586
2019-02-04 20:37:00 C 00 28 29.528 +01 04 03.26 V J04
2019-02-04 21:00:05 C 00 28 33.898 +01 04 28.34 V J04
2020-01-08 18:41:42 C 00 10 42.40 -05 19 26.3 q C95
2020-01-08 19:11:52 C 00 10 48.99 -05 18 47.2 q C95
2020-01-21 18:02:59 C 01 17 17.10 +00 56 40.6 V 246
2020-01-21 18:03:52 C 01 17 17.32 +00 56 40.2 V 246
2020-01-21 18:04:18 C 01 17 17.22 +00 56 40.4 V 246
2020-01-22 18:13:40 C 01 22 11.57 +01 24 38.5 V 511
2020-01-22 18:17:20 C 01 22 12.33 +01 24 42.9 V 511
2020-01-22 18:20:43 C 01 22 12.99 +01 24 46.9 V 511
2020-01-22 18:24:05 C 01 22 13.63 +01 24 50.7 V 511
2020-01-22 18:33:33 C 01 22 15.52 +01 25 01.4 V 511
2020-01-22 18:36:57 C 01 22 16.25 +01 25 05.7 V 511
2020-01-22 18:40:20 C 01 22 16.87 +01 25 09.1 V 511
2020-01-22 18:43:42 C 01 22 17.55 +01 25 13.3 V 511
2020-01-22 18:47:05 C 01 22 18.23 +01 25 17.3 V 511
2020-02-07 18:58:27 C 02 35 28.98 +08 07 23.1 V 586
2020-02-07 19:14:43 C 02 35 31.87 +08 07 38.4 V 586
2020-02-07 19:32:43 C 02 35 35.04 +08 07 55.0 V 586
2020-02-07 19:44:32 C 02 35 37.14 +08 08 05.7 V 586
2020-02-07 19:58:03 C 02 35 39.50 +08 08 18.2 V 586
2020-02-07 20:07:09 C 02 35 41.06 +08 08 26.7 V 586
2020-02-07 20:13:18 C 02 35 42.17 +08 08 32.5 V 586
2020-02-07 20:17:39 C 02 35 42.96 +08 08 36.4 V 586
2020-02-07 20:22:43 C 02 35 43.87 +08 08 41.0 V 586
2020-02-18 19:30:18 C 03 21 15.25 +11 49 42.3 V 586
2020-02-18 19:34:25 C 03 21 15.93 +11 49 45.4 V 586
2020-02-18 19:38:30 C 03 21 16.61 +11 49 48.5 V 586
2020-02-18 19:42:36 C 03 21 17.28 +11 49 51.5 V 586
2020-02-18 19:46:43 C 03 21 17.94 +11 49 54.4 V 586
2020-02-18 19:50:49 C 03 21 18.63 +11 49 57.7 V 586
2020-02-18 19:55:50 C 03 21 19.44 +11 50 01.4 V 586
2020-02-18 20:01:43 C 03 21 20.42 +11 50 05.8 V 586
2020-02-18 20:05:48 C 03 21 21.10 +11 50 09.0 V 586
2020-02-18 20:14:02 C 03 21 22.44 +11 50 15.0 V 586
2020-02-18 20:19:30 C 03 21 23.36 +11 50 19.2 V 586
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)