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
2021-03-09 21:08:32 C 09 10 23.51 -04 33 07.8 u 152
2021-03-09 21:09:33 C 09 10 23.32 -04 33 05.6 u 152
2021-03-09 21:16:50 C 09 10 21.99 -04 32 50.8 u 152
2021-03-09 21:19:48 C 09 10 22.01 -04 32 42.3 V C43
2021-03-09 21:48:41 C 09 10 16.25 -04 31 46.1 o 152
2021-03-09 21:49:43 C 09 10 16.08 -04 31 44.2 o 152
2021-03-09 22:06:14 C 09 10 13.10 -04 31 10.4 o 152
2021-03-09 22:07:15 C 09 10 12.90 -04 31 08.3 o 152
2021-03-09 22:20:40 C 09 10 10.51 -04 30 41.1 o 152
2021-03-09 22:21:42 C 09 10 10.34 -04 30 39.1 o 152
2021-03-10 00:44:43 C 09 09 49.97 -04 24 04.5 V W88
2021-03-10 00:46:46 C 09 09 49.60 -04 24 00.4 V W88
2021-03-10 00:53:11 C 09 09 47.55 -04 23 46.3 q 834
2021-03-10 01:23:33 C 09 09 42.85 -04 24 18.7 S 932
2021-03-10 01:29:59 C 09 09 40.71 -04 22 31.7 q 834
2021-03-10 01:53:06 C 09 09 37.42 -04 23 18.7 S 932
2021-03-10 02:53:40 C 09 09 26.26 -04 21 15.9 S 932
2021-03-10 10:44:29 C 09 08 10.72 -04 05 10.5 t P66
2021-03-10 10:44:59 C 09 08 10.72 -04 05 10.6 t P66
2021-03-10 11:09:55 C 09 08 06.13 -04 04 19.1 t P66
2021-03-10 11:10:26 C 09 08 06.13 -04 04 19.1 t P66
2021-03-10 11:25:29 C 09 08 02.55 -04 03 51.0 q Q21
2021-03-10 11:27:00 C 09 08 02.27 -04 03 48.4 q Q21
2021-03-10 11:33:02 C 09 08 01.15 -04 03 35.6 q Q21
2021-03-10 11:36:04 C 09 08 00.63 -04 03 30.0 q Q21
2021-03-10 11:36:17 C 09 08 01.34 -04 03 25.8 t P66
2021-03-10 11:36:48 C 09 08 01.34 -04 03 25.9 t P66
2021-03-10 11:40:36 C 09 07 59.75 -04 03 20.7 q Q21
2021-03-10 11:45:08 C 09 07 58.91 -04 03 11.3 q Q21
2021-03-10 11:54:12 C 09 07 57.28 -04 02 52.7 q Q21
2021-03-10 12:02:38 C 09 07 56.53 -04 02 32.4 t P66
2021-03-10 12:03:08 C 09 07 56.53 -04 02 32.4 t P66
2021-03-10 12:29:05 C 09 07 51.69 -04 01 38.9 t P66
2021-03-10 12:29:34 C 09 07 51.70 -04 01 38.9 t P66
2021-03-10 12:55:28 C 09 07 46.86 -04 00 45.4 t P66
2021-03-10 12:55:58 C 09 07 46.86 -04 00 45.4 t P66
2021-03-10 13:21:48 C 09 07 42.03 -03 59 52.0 t P66
2021-03-10 13:22:17 C 09 07 42.03 -03 59 52.0 t P66
2021-03-10 13:48:20 C 09 07 37.16 -03 58 58.1 t P66
2021-03-10 13:48:50 C 09 07 37.16 -03 58 58.1 t P66
2021-03-10 14:06:09 C 09 07 36.47 -03 58 36.8 V N82
2021-03-10 14:14:40 C 09 07 32.33 -03 58 04.5 t P66
2021-03-10 14:15:11 C 09 07 32.33 -03 58 04.5 t P66
2021-03-10 14:28:31 C 09 07 32.50 -03 57 51.8 V N82
2021-03-10 14:41:01 C 09 07 27.52 -03 57 10.9 t P66
2021-03-10 14:41:30 C 09 07 27.52 -03 57 10.9 t P66
2021-03-10 14:50:53 C 09 07 28.54 -03 57 06.4 V N82
2021-03-10 15:05:13 C 09 07 23.12 -03 56 21.5 t P66
2021-03-10 15:05:43 C 09 07 23.12 -03 56 21.5 t P66
2021-03-10 17:28:13 C 09 07 02.49 -03 51 21.4 q M44
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)