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
2021-04-09 04:17:37 C 08 05 18.66 +15 00 07.3 V 703
2021-04-09 04:25:49 C 08 05 18.34 +15 00 16.4 V 703
2021-04-09 07:14:38 C 08 05 13.56 +15 03 37.3 V T08
2021-04-09 07:19:17 C 08 05 13.35 +15 03 42.2 V T08
2021-04-09 07:29:57 C 08 05 12.91 +15 03 53.8 V T08
2021-04-09 07:44:10 C 08 05 12.31 +15 04 08.9 V T08
2021-04-09 13:11:03 C 08 05 03.11 +15 09 53.4 q 900
2021-04-09 13:26:11 C 08 05 02.58 +15 10 09.2 q 900
2021-04-10 10:04:21 S 08 04 32.789 +15 32 47.72 X 275
2021-04-10 12:53:34 C 08 04 26.27 +15 35 43.5 q D95
2021-04-10 13:09:03 C 08 04 25.78 +15 35 59.1 q D95
2021-04-10 13:12:09 C 08 04 25.68 +15 36 02.8 q D95
2021-04-10 18:55:54 C 08 04 18.95 +15 42 01.3 o 069
2021-04-10 19:10:55 C 08 04 18.43 +15 42 17.2 o 069
2021-04-10 19:25:54 C 08 04 17.96 +15 42 33.2 o 069
2021-04-11 00:02:58 C 08 04 10.45 +15 48 41.9 X Y00
2021-04-11 00:10:42 C 08 04 10.10 +15 48 49.8 X Y00
2021-04-11 00:18:27 C 08 04 09.87 +15 48 58.2 X Y00
2021-04-11 00:26:11 C 08 04 09.57 +15 49 06.2 X Y00
2021-04-11 00:33:56 C 08 04 09.23 +15 49 14.2 X Y00
2021-04-11 04:25:00 S 08 04 04.340 +15 52 28.70 X 275
2021-04-11 17:21:19 C 08 03 46.39 +16 06 22.2 q C97
2021-04-11 17:23:45 C 08 03 46.28 +16 06 25.2 q C97
2021-04-11 17:31:02 C 08 03 46.04 +16 06 32.1 q C97
2021-04-11 17:33:28 C 08 03 45.96 +16 06 34.7 q C97
2021-04-11 17:35:53 C 08 03 45.84 +16 06 35.2 q C97
2021-04-11 21:31:27 C 08 03 41.40 +16 10 17.7 V Z80
2021-04-11 21:36:52 C 08 03 41.24 +16 10 23.6 V Z80
2021-04-12 04:36:26 C 08 03 32.62 +16 17 52.6 V U52
2021-04-12 05:04:04 C 08 03 31.69 +16 18 21.4 V U52
2021-04-12 05:31:43 C 08 03 30.81 +16 18 49.6 V U52
2021-04-12 17:03:50 C 08 03 17.07 +16 30 34.9 q 168
2021-04-12 17:23:30 C 08 03 16.47 +16 30 54.9 q 168
2021-04-12 18:47:30 C 08 03 14.30 +16 32 19.0 q 168
2021-04-12 20:48:35 C 08 03 12.51 +16 34 31.4 V Z80
2021-04-12 20:53:35 C 08 03 12.31 +16 34 35.6 V Z80
2021-04-12 20:58:35 C 08 03 12.25 +16 34 40.7 V Z80
2021-04-13 04:44:38 C 08 03 02.96 +16 42 47.9 V U52
2021-04-13 05:05:52 C 08 03 02.30 +16 43 09.5 V U52
2021-04-13 05:27:07 C 08 03 01.63 +16 43 30.7 V U52
2021-04-13 19:37:05 C 08 02 46.48 +16 57 54.3 v 511
2021-04-13 19:47:46 C 08 02 46.17 +16 58 04.1 v 511
2021-04-13 19:58:27 C 08 02 45.85 +16 58 15.2 v 511
2021-04-13 20:14:39 C 08 02 45.14 +16 58 30.3 V 160
2021-04-13 20:17:33 C 08 02 45.06 +16 58 33.2 V 160
2021-04-13 20:20:28 C 08 02 44.97 +16 58 36.1 V 160
2021-04-13 21:27:52 C 08 02 43.80 +16 59 37.3 V Z80
2021-04-13 21:35:22 C 08 02 43.58 +16 59 44.9 V Z80
2021-04-14 16:56:30 C 08 02 23.58 +17 19 03.8 q 168
2021-04-14 17:04:30 C 08 02 23.44 +17 19 11.7 q 168
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)