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
2013-01-11 22:41:24 C 08 56 10.09 -23 34 01.8 o C77
2013-01-11 22:41:40 C 08 56 09.99 -23 34 02.4 o C77
2013-01-11 22:42:14 C 08 56 09.92 -23 34 00.8 o C77
2013-01-11 23:27:44 C 08 55 58.06 -23 33 06.3 u K21
2013-01-11 23:44:38 C 08 55 52.98 -23 32 46.1 q 470
2013-01-11 23:45:47 C 08 55 52.70 -23 32 44.8 q 470
2013-01-11 23:46:20 C 08 55 52.53 -23 32 44.1 q 470
2013-01-11 23:46:54 C 08 55 52.37 -23 32 43.0 q 470
2013-01-11 23:47:29 C 08 55 52.18 -23 32 42.5 q 470
2013-01-11 23:51:00 C 08 55 51.87 -23 32 38.5 u K21
2013-01-12 00:22:13 C 08 55 43.61 -23 32 00.5 u K21
2013-01-12 01:08:01 C 08 55 31.66 -23 31 02.6 c 213
2013-01-12 01:15:55 C 08 55 29.55 -23 30 52.8 c 213
2013-01-12 01:46:52 C 08 55 21.36 -23 30 13.7 u B74
2013-01-12 01:51:10 C 08 55 20.23 -23 30 08.5 u B74
2013-01-12 02:01:46 C 08 55 17.39 -23 29 55.1 u B74
2013-01-12 02:10:33 C 08 55 15.05 -23 29 44.0 c 232
2013-01-12 02:28:57 C 08 55 10.17 -23 29 20.5 c 232
2013-01-12 02:43:18 C 08 55 05.88 -23 29 03.2 t 204
2013-01-12 02:46:42 C 08 55 04.98 -23 28 58.8 t 204
2013-01-12 02:50:26 C 08 55 04.01 -23 28 53.8 t 204
2013-01-12 02:54:09 C 08 55 03.03 -23 28 48.9 t 204
2013-01-12 02:56:05 C 08 55 02.95 -23 28 45.2 c 232
2013-01-12 02:57:53 C 08 55 02.03 -23 28 44.2 t 204
2013-01-12 04:59:59 C 08 54 34.73 -23 24 31.7 u 844
2013-01-12 05:02:41 C 08 54 34.04 -23 24 28.4 u 844
2013-01-12 05:05:21 C 08 54 33.30 -23 24 24.8 u 844
2013-01-12 05:08:01 C 08 54 32.58 -23 24 21.5 u 844
2013-01-12 05:10:43 C 08 54 31.86 -23 24 18.1 u 844
2013-01-12 23:18:05 C 08 50 09.51 -23 02 09.0 r J47
2013-01-12 23:42:45 C 08 50 02.99 -23 01 38.4 r J47
2013-01-13 00:04:23 C 08 49 57.26 -23 01 11.4 r J47
2013-01-13 00:27:03 C 08 49 49.02 -23 01 01.4 u 510
2013-01-13 00:34:38 C 08 49 47.04 -23 00 51.5 u 510
2013-01-13 00:42:12 C 08 49 45.05 -23 00 41.4 u 510
2013-01-13 00:49:47 C 08 49 43.07 -23 00 31.0 u 510
2013-01-13 00:57:22 C 08 49 41.07 -23 00 21.3 u 510
2013-01-13 01:04:57 C 08 49 39.07 -23 00 10.9 u 510
2013-01-13 01:12:32 C 08 49 37.08 -23 00 00.5 u 510
2013-01-13 01:20:07 C 08 49 35.09 -22 59 50.4 u 510
2013-01-13 01:27:42 C 08 49 33.12 -22 59 40.1 u 510
2013-01-13 01:35:17 C 08 49 31.11 -22 59 30.0 u 510
2013-01-13 01:42:51 C 08 49 29.14 -22 59 19.7 u 510
2013-01-13 01:50:26 C 08 49 27.14 -22 59 09.7 u 510
2013-01-13 01:58:01 C 08 49 25.16 -22 58 58.9 u 510
2013-01-13 02:05:36 C 08 49 23.21 -22 58 48.5 u 510
2013-01-13 02:13:11 C 08 49 21.18 -22 58 37.9 u 510
2013-01-13 02:20:46 C 08 49 19.21 -22 58 27.9 u 510
2013-01-13 08:06:23 C 08 47 56.81 -22 50 30.9 u H06
2013-01-13 08:21:50 C 08 47 52.68 -22 50 10.4 u H06
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)