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
2021-03-20 21:45:07 C 08 33 53.26 +04 01 57.1 V L63
2021-03-20 21:51:01 C 08 33 52.56 +04 02 07.4 V L63
2021-03-20 22:21:38 C 08 33 49.32 +04 03 01.9 q G07
2021-03-20 22:38:47 C 08 33 47.28 +04 03 32.4 q G07
2021-03-20 22:52:14 C 08 33 45.69 +04 03 56.0 q G07
2021-03-20 23:20:49 C 08 33 42.32 +04 04 46.9 q G07
2021-03-21 02:22:43 C 08 33 25.89 +04 10 14.5 V V93
2021-03-21 03:17:09 C 08 33 19.28 +04 11 50.9 V V93
2021-03-21 03:42:50 C 08 33 17.47 +04 12 45.4 V G96
2021-03-21 03:50:56 C 08 33 16.48 +04 12 59.7 V G96
2021-03-21 03:59:01 C 08 33 15.49 +04 13 14.1 V G96
2021-03-21 04:07:06 C 08 33 14.50 +04 13 28.5 V G96
2021-03-21 04:10:18 C 08 33 12.93 +04 13 25.5 V V93
2021-03-21 06:33:13 C 08 32 56.41 +04 17 55.1 Y V26
2021-03-21 06:57:52 C 08 32 53.50 +04 18 38.3 Y V26
2021-03-21 07:17:00 C 08 32 51.30 +04 19 11.7 Y V26
2021-03-21 07:22:28 C 08 32 50.65 +04 19 21.6 Y V26
2021-03-21 17:11:45 C 08 31 53.42 +04 36 40.4 q M44
2021-03-21 17:25:09 C 08 31 51.79 +04 37 04.6 q M44
2021-03-21 17:43:26 C 08 31 49.60 +04 37 35.5 q M44
2021-03-21 18:59:03 C 08 31 43.60 +04 39 28.8 q L47
2021-03-21 19:21:00 C 08 31 40.95 +04 40 06.4 q L47
2021-03-21 21:08:08 C 08 31 28.30 +04 43 03.0 u 152
2021-03-21 21:08:53 C 08 31 28.21 +04 43 04.2 u 152
2021-03-21 21:10:29 C 08 31 28.02 +04 43 07.0 u 152
2021-03-21 21:12:06 C 08 31 27.85 +04 43 09.6 u 152
2021-03-21 21:13:44 C 08 31 27.66 +04 43 12.6 u 152
2021-03-21 21:15:21 C 08 31 27.50 +04 43 15.1 u 152
2021-03-21 21:22:19 C 08 31 26.69 +04 43 27.8 u 152
2021-03-21 21:32:16 C 08 31 25.66 +04 43 44.4 u 152
2021-03-21 22:16:51 C 08 31 21.61 +04 45 05.9 V Z80
2021-03-21 22:21:51 C 08 31 21.03 +04 45 14.8 V Z80
2021-03-21 22:26:51 C 08 31 20.50 +04 45 23.3 V Z80
2021-03-22 05:11:35 S 08 30 38.415 +04 57 29.52 X 275
2021-03-22 07:00:21 C 08 30 27.53 +05 00 41.5 Y V26
2021-03-22 07:27:07 C 08 30 24.60 +05 01 27.1 Y V26
2021-03-22 07:52:07 C 08 30 21.91 +05 02 09.5 Y V26
2021-03-22 08:17:04 C 08 30 19.28 +05 02 52.2 Y V26
2021-03-22 11:08:15 C 08 30 07.49 +05 07 40.0 t P66
2021-03-22 11:14:28 C 08 30 06.77 +05 07 50.8 t P66
2021-03-22 11:22:13 C 08 30 05.89 +05 08 04.1 t P66
2021-03-22 11:30:01 C 08 30 05.00 +05 08 17.4 t P66
2021-03-22 11:37:46 C 08 30 04.11 +05 08 31.0 t P66
2021-03-22 11:45:34 C 08 30 03.23 +05 08 44.2 t P66
2021-03-22 11:53:19 C 08 30 02.33 +05 08 57.5 t P66
2021-03-22 12:01:10 C 08 30 01.44 +05 09 11.2 t P66
2021-03-22 12:08:58 C 08 30 00.54 +05 09 24.5 t P66
2021-03-22 12:16:43 C 08 29 59.65 +05 09 38.0 t P66
2021-03-22 12:24:29 C 08 29 58.78 +05 09 51.2 t P66
2021-03-22 12:32:17 C 08 29 57.88 +05 10 04.6 t P66
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)