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
2021-02-17 19:30:46 C 10 39 49.43 -17 22 43.4 N42
2021-02-17 19:32:03 C 10 39 49.19 -17 22 42.4 N42
2021-02-17 19:33:21 C 10 39 48.95 -17 22 41.1 N42
2021-02-17 19:34:38 C 10 39 48.71 -17 22 40.1 N42
2021-02-17 19:35:55 C 10 39 48.48 -17 22 38.9 N42
2021-02-17 19:37:12 C 10 39 48.25 -17 22 37.7 N42
2021-02-17 19:38:30 C 10 39 48.00 -17 22 36.6 N42
2021-02-17 19:39:47 C 10 39 47.78 -17 22 35.6 N42
2021-02-17 19:41:04 C 10 39 47.54 -17 22 34.4 N42
2021-02-17 19:42:22 C 10 39 47.28 -17 22 33.2 N42
2021-02-17 19:43:39 C 10 39 47.05 -17 22 32.1 N42
2021-02-17 19:44:56 C 10 39 46.82 -17 22 30.9 N42
2021-02-17 19:46:13 C 10 39 46.58 -17 22 29.6 N42
2021-02-17 19:47:31 C 10 39 46.33 -17 22 28.7 N42
2021-02-17 19:48:48 C 10 39 46.08 -17 22 27.2 N42
2021-02-17 19:50:05 C 10 39 45.85 -17 22 26.3 N42
2021-02-17 19:51:23 C 10 39 45.63 -17 22 25.2 N42
2021-02-17 19:52:39 C 10 39 45.36 -17 22 23.9 N42
2021-02-17 19:53:57 C 10 39 45.15 -17 22 23.1 N42
2021-02-17 19:55:14 C 10 39 44.91 -17 22 21.8 N42
2021-02-17 19:56:32 C 10 39 44.66 -17 22 20.6 N42
2021-02-17 19:57:49 C 10 39 44.40 -17 22 19.6 N42
2021-02-17 19:58:37 C 10 39 45.12 -17 22 24.8 q 168
2021-02-17 19:59:07 C 10 39 44.19 -17 22 18.4 N42
2021-02-17 20:00:23 C 10 39 43.95 -17 22 17.2 N42
2021-02-17 20:01:41 C 10 39 43.72 -17 22 16.0 N42
2021-02-17 20:02:58 C 10 39 43.48 -17 22 14.9 N42
2021-02-17 20:04:16 C 10 39 43.25 -17 22 13.9 N42
2021-02-17 20:05:33 C 10 39 42.97 -17 22 12.4 N42
2021-02-17 20:06:50 C 10 39 42.74 -17 22 11.2 N42
2021-02-17 20:08:07 C 10 39 42.53 -17 22 10.2 N42
2021-02-17 20:09:25 C 10 39 42.27 -17 22 08.7 N42
2021-02-17 20:10:42 C 10 39 41.97 -17 22 08.4 N42
2021-02-17 20:12:00 C 10 39 41.80 -17 22 06.6 N42
2021-02-17 20:13:17 C 10 39 41.53 -17 22 06.4 N42
2021-02-17 20:14:34 C 10 39 41.30 -17 22 04.2 N42
2021-02-17 20:15:21 C 10 39 42.76 -17 21 48.9 V M43
2021-02-17 20:15:51 C 10 39 41.08 -17 22 03.2 N42
2021-02-17 20:17:09 C 10 39 40.85 -17 22 02.1 N42
2021-02-17 20:18:26 C 10 39 40.63 -17 22 00.9 N42
2021-02-17 20:19:44 C 10 39 40.37 -17 21 59.7 N42
2021-02-17 20:21:01 C 10 39 40.13 -17 21 58.5 N42
2021-02-17 20:22:18 C 10 39 39.89 -17 21 57.3 N42
2021-02-17 20:22:30 C 10 39 41.44 -17 21 42.8 V M43
2021-02-17 20:23:35 C 10 39 39.63 -17 21 56.1 N42
2021-02-17 20:24:53 C 10 39 39.40 -17 21 55.0 N42
2021-02-17 20:26:10 C 10 39 39.17 -17 21 53.8 N42
2021-02-17 20:27:09 C 10 39 39.64 -17 21 50.6 V 186
2021-02-17 20:27:28 C 10 39 38.94 -17 21 52.8 N42
2021-02-17 20:28:45 C 10 39 38.69 -17 21 51.6 N42
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)