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
2021-03-23 22:58:58 C 08 26 43.82 +06 08 03.6 V Z80
2021-03-24 18:57:21 C 08 25 01.38 +06 41 05.3 q L47
2021-03-24 19:03:45 C 08 25 00.80 +06 41 15.1 q L47
2021-03-24 21:17:08 C 08 24 48.45 +06 44 43.3 V Z99
2021-03-24 21:21:44 C 08 24 48.00 +06 44 50.6 V Z99
2021-03-24 21:26:18 C 08 24 47.54 +06 44 58.1 V Z99
2021-03-24 21:30:52 C 08 24 47.11 +06 45 05.5 V Z99
2021-03-24 21:35:25 C 08 24 46.69 +06 45 13.0 V Z99
2021-03-24 22:11:17 C 08 24 42.21 +06 46 21.5 V L74
2021-03-24 22:23:31 C 08 24 41.04 +06 46 40.8 V L74
2021-03-24 22:36:24 C 08 24 39.82 +06 47 01.5 V L74
2021-03-24 22:55:48 C 08 24 38.40 +06 47 34.9 V K14
2021-03-24 22:55:48 C 08 24 38.41 +06 47 34.9 V K14
2021-03-24 23:04:34 C 08 24 37.58 +06 47 49.0 V K14
2021-03-24 23:13:22 C 08 24 36.72 +06 48 03.7 V K14
2021-03-24 23:24:35 C 08 24 35.68 +06 48 21.1 V K14
2021-03-24 23:29:34 C 08 24 35.82 +06 48 19.0 V Z80
2021-03-24 23:31:10 C 08 24 35.05 +06 48 31.6 V K14
2021-03-24 23:32:04 C 08 24 35.61 +06 48 22.8 V Z80
2021-03-24 23:35:19 C 08 24 35.22 +06 48 27.2 V Z80
2021-03-25 18:35:33 C 08 23 03.98 +07 19 03.0 q 056
2021-03-25 18:43:48 C 08 23 03.21 +07 19 15.3 q 056
2021-03-25 19:00:18 C 08 23 01.65 +07 19 42.1 q 056
2021-03-25 19:08:31 C 08 23 00.81 +07 19 57.2 q 056
2021-03-25 19:16:46 C 08 23 00.09 +07 20 08.8 q 056
2021-03-25 19:25:01 C 08 22 59.33 +07 20 20.9 q 056
2021-03-25 19:49:46 C 08 22 57.02 +07 21 00.1 q 056
2021-03-25 20:23:49 C 08 22 53.62 +07 21 57.6 L54
2021-03-25 20:40:25 C 08 22 52.10 +07 22 23.5 L54
2021-03-25 21:11:17 C 08 22 49.29 +07 23 11.5 L54
2021-03-25 21:36:13 C 08 22 47.07 +07 23 51.6 L54
2021-03-25 22:55:41 C 08 22 41.10 +07 25 52.1 V Z80
2021-03-25 23:09:43 C 08 22 39.83 +07 26 14.0 V Z80
2021-03-25 23:33:18 C 08 22 37.82 +07 26 51.1 V Z80
2021-03-26 12:31:25 C 08 21 37.92 +07 47 30.8 q 900
2021-03-26 12:41:30 C 08 21 36.99 +07 47 46.6 q 900
2021-03-26 12:53:51 C 08 21 35.86 +07 48 05.8 q 900
2021-03-26 13:04:02 C 08 21 34.94 +07 48 21.4 q 900
2021-03-26 22:48:50 C 08 20 50.74 +08 03 12.3 V Z80
2021-03-26 22:51:26 C 08 20 50.58 +08 03 16.1 V Z80
2021-03-26 22:54:00 C 08 20 50.35 +08 03 20.3 V Z80
2021-03-27 07:39:21 C 08 20 12.10 +08 17 21.0 V T08
2021-03-27 07:44:00 C 08 20 11.69 +08 17 27.9 V T08
2021-03-27 08:12:36 C 08 20 09.09 +08 18 11.4 V T08
2021-03-28 18:24:47 C 08 17 47.28 +09 09 05.1 V C40
2021-03-28 18:52:31 C 08 17 45.03 +09 09 45.9 V C40
2021-03-28 19:26:36 C 08 17 42.35 +09 10 35.2 V C40
2021-03-28 19:32:51 C 08 17 43.32 +09 10 46.7 V G17
2021-03-28 19:43:01 C 08 17 42.50 +09 11 01.4 V G17
2021-03-28 19:45:06 C 08 17 40.95 +09 11 02.0 V C40
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)