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
2021-03-08 06:00:50 C 09 17 06.94 -05 51 51.4 14.6 Y V26
2021-03-08 06:26:02 C 09 17 02.01 -05 51 00.5 16.1 Y V26
2021-03-08 07:11:58 C 09 16 53.06 -05 49 27.3 15.8 Y V26
2021-03-08 07:28:45 C 09 16 49.82 -05 48 53.2 Y V26
2021-03-08 13:06:43 C 09 15 52.93 -05 37 47.4 q D95
2021-03-08 13:10:55 C 09 15 52.13 -05 37 39.0 q D95
2021-03-08 13:19:18 C 09 15 50.52 -05 37 22.0 q D95
2021-03-08 13:20:21 C 09 15 50.32 -05 37 19.9 q D95
2021-03-08 16:35:45 C 09 15 19.00 -05 30 28.0 q C97
2021-03-08 16:36:27 C 09 15 18.86 -05 30 26.5 q C97
2021-03-08 16:37:10 C 09 15 18.73 -05 30 25.2 q C97
2021-03-08 16:37:52 C 09 15 18.59 -05 30 23.8 q C97
2021-03-08 16:38:34 C 09 15 18.44 -05 30 22.2 q C97
2021-03-08 16:39:17 C 09 15 18.31 -05 30 21.0 q C97
2021-03-08 16:39:59 C 09 15 18.18 -05 30 19.5 q C97
2021-03-08 17:32:14 C 09 15 08.30 -05 28 35.2 q M44
2021-03-08 17:48:51 C 09 15 05.08 -05 28 01.7 q M44
2021-03-08 17:53:21 C 09 15 04.21 -05 27 51.8 q M44
2021-03-08 18:34:53 C 09 14 57.91 -05 26 41.7 V A84
2021-03-08 18:36:43 C 09 14 57.57 -05 26 38.2 V A84
2021-03-08 18:38:32 C 09 14 57.23 -05 26 34.5 V A84
2021-03-08 18:40:22 C 09 14 56.88 -05 26 30.9 V A84
2021-03-08 18:42:12 C 09 14 56.52 -05 26 27.2 V A84
2021-03-08 18:44:02 C 09 14 56.19 -05 26 23.6 V A84
2021-03-08 18:45:51 C 09 14 55.83 -05 26 19.8 V A84
2021-03-08 18:47:41 C 09 14 55.48 -05 26 16.1 V A84
2021-03-08 18:49:31 C 09 14 55.14 -05 26 12.6 V A84
2021-03-08 18:51:21 C 09 14 54.79 -05 26 08.9 V A84
2021-03-08 18:53:10 C 09 14 54.44 -05 26 05.2 V A84
2021-03-08 18:55:00 C 09 14 54.09 -05 26 01.5 V A84
2021-03-08 18:56:50 C 09 14 53.75 -05 25 57.8 V A84
2021-03-08 18:57:03 C 09 14 54.51 -05 26 04.4 V L01
2021-03-08 18:58:39 C 09 14 53.40 -05 25 54.1 V A84
2021-03-08 19:00:29 C 09 14 53.05 -05 25 50.5 V A84
2021-03-08 19:00:46 C 09 14 53.81 -05 25 57.0 V L01
2021-03-08 19:05:07 C 09 14 52.99 -05 25 48.2 V L01
2021-03-08 19:08:52 C 09 14 52.30 -05 25 40.6 V L01
2021-03-08 19:13:17 C 09 14 50.61 -05 25 24.7 V A84
2021-03-08 19:13:32 C 09 14 51.42 -05 25 31.4 V L01
2021-03-08 19:15:07 C 09 14 50.27 -05 25 21.0 V A84
2021-03-08 19:16:57 C 09 14 49.92 -05 25 17.3 V A84
2021-03-08 19:18:46 C 09 14 49.57 -05 25 13.8 V A84
2021-03-08 19:20:36 C 09 14 49.22 -05 25 10.0 V A84
2021-03-08 19:22:26 C 09 14 48.87 -05 25 06.3 V A84
2021-03-08 19:24:16 C 09 14 48.51 -05 25 02.6 V A84
2021-03-08 19:26:05 C 09 14 48.17 -05 24 59.0 V A84
2021-03-08 19:27:55 C 09 14 47.86 -05 24 55.8 V A84
2021-03-08 19:29:45 C 09 14 47.47 -05 24 51.6 V A84
2021-03-08 19:31:35 C 09 14 47.11 -05 24 47.9 V A84
2021-03-08 19:31:41 C 09 14 47.45 -05 24 55.5 V L54
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)