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
2013-04-01 02:51:35 C 07 19 19.83 +16 09 26.9 q H45
2013-04-01 02:52:44 C 07 19 19.90 +16 09 27.5 q H45
2013-04-04 07:04:52 C 07 24 41.656 +16 40 05.00 t F65
2013-04-04 07:08:23 C 07 24 41.882 +16 40 06.25 t F65
2013-04-05 07:05:21 C 07 26 25.525 +16 49 05.36 t F65
2013-04-05 07:08:34 C 07 26 25.733 +16 49 06.47 t F65
2013-04-05 20:38:42 C 07 27 25.29 +16 54 00.0 q 950
2013-04-05 20:40:29 C 07 27 25.40 +16 54 00.6 q 950
2013-04-05 20:42:16 C 07 27 25.51 +16 54 01.2 q 950
2013-04-05 20:44:02 C 07 27 25.63 +16 54 01.9 q 950
2013-04-05 20:45:50 C 07 27 25.75 +16 54 02.5 q 950
2013-04-05 20:47:36 C 07 27 25.86 +16 54 03.1 q 950
2013-04-05 20:49:24 C 07 27 25.98 +16 54 03.8 q 950
2013-04-08 06:06:58 C 07 31 39.647 +17 14 09.35 t F65
2013-04-08 06:08:39 C 07 31 39.773 +17 14 09.25 t F65
2013-04-10 20:13:58 C 07 36 20.83 +17 33 58.4 v B04
2013-04-10 20:31:51 C 07 36 22.12 +17 34 04.8 v B04
2013-04-10 20:44:41 C 07 36 23.04 +17 34 07.4 v B04
2013-04-10 21:02:33 C 07 36 24.37 +17 34 12.4 v B04
2013-04-12 07:04:35 C 07 39 00.954 +17 44 41.87 t F65
2013-04-12 07:07:38 C 07 39 01.168 +17 44 42.62 t F65
2013-04-12 19:41:57 C 07 39 59.86 +17 48 12.9 u B88
2013-04-12 20:18:01 C 07 40 02.50 +17 48 22.0 u B88
2013-04-12 21:05:21 C 07 40 05.81 +17 48 34.4 u B88
2013-04-14 19:43:02 C 07 43 44.16 +18 01 41.3 u B88
2013-04-14 20:17:36 C 07 43 46.71 +18 01 50.0 u B88
2013-04-14 20:28:20 C 07 43 47.95 +18 02 01.4 q 950
2013-04-14 20:30:06 C 07 43 48.08 +18 02 01.9 q 950
2013-04-14 20:31:51 C 07 43 48.20 +18 02 02.5 q 950
2013-04-14 20:52:09 C 07 43 49.32 +18 01 59.0 u B88
2013-04-15 03:15:00 C 07 44 19.64 +18 03 49.0 u 703
2013-04-15 03:35:58 C 07 44 21.12 +18 03 55.1 u 703
2013-04-15 03:46:29 C 07 44 21.91 +18 03 57.2 u 703
2013-04-19 07:03:37 C 07 52 13.350 +18 28 59.28 t F65
2013-04-19 07:06:33 C 07 52 13.592 +18 28 59.43 t F65
2013-04-26 01:46:48 C 08 05 16.96 +19 03 21.6 u H21
2013-04-26 01:52:43 C 08 05 17.42 +19 03 22.5 u H21
2013-04-26 01:58:24 C 08 05 17.86 +19 03 23.4 u H21
2013-04-30 03:30:48 C 08 13 06.60 +19 21 09.7 u 703
2013-04-30 03:39:44 C 08 13 07.28 +19 21 12.0 u 703
2013-04-30 03:48:37 C 08 13 07.96 +19 21 11.2 u 703
2013-05-07 03:10:35 C 08 26 21.12 +19 47 59.6 u 703
2013-05-07 03:18:39 C 08 26 21.66 +19 48 00.9 u 703
2013-05-07 03:26:46 C 08 26 22.27 +19 48 02.7 u 703
2013-05-07 03:34:50 C 08 26 22.88 +19 48 03.1 u 703
2013-05-09 06:47:31 C 08 30 20.126 +19 55 45.77 L F51
2013-05-09 06:53:12 C 08 30 20.531 +19 55 46.45 L F51
2013-05-09 06:58:54 C 08 30 20.942 +19 55 47.14 L F51
2013-05-09 07:04:35 C 08 30 21.351 +19 55 47.81 L F51
2013-05-27 06:13:33 C 08 59 49.215 +21 07 57.79 t F65
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)