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
2021-04-09 00:24:20 C 08 05 26.03 +14 55 36.8 V I22
2021-04-09 00:24:59 C 08 05 26.04 +14 55 37.4 V I22
2021-04-09 00:25:37 C 08 05 26.02 +14 55 38.1 V I22
2021-04-09 00:26:16 C 08 05 25.97 +14 55 39.0 V I22
2021-04-09 00:26:54 C 08 05 25.95 +14 55 39.5 V I22
2021-04-09 00:27:33 C 08 05 25.96 +14 55 40.3 V I22
2021-04-09 00:28:12 C 08 05 25.93 +14 55 41.2 V I22
2021-04-09 00:28:52 C 08 05 25.88 +14 55 41.9 V I22
2021-04-09 00:29:31 C 08 05 25.83 +14 55 42.5 V I22
2021-04-09 00:30:10 C 08 05 25.83 +14 55 43.2 V I22
2021-04-09 00:30:48 C 08 05 25.79 +14 55 44.1 V I22
2021-04-09 00:31:27 C 08 05 25.77 +14 55 44.7 V I22
2021-04-09 00:32:06 C 08 05 25.73 +14 55 45.2 V I22
2021-04-09 00:32:44 C 08 05 25.73 +14 55 46.0 V I22
2021-04-09 00:33:28 C 08 05 25.70 +14 55 46.8 V I22
2021-04-09 00:34:07 C 08 05 25.68 +14 55 47.5 V I22
2021-04-09 00:34:47 C 08 05 25.65 +14 55 48.1 V I22
2021-04-09 00:35:24 C 08 05 25.60 +14 55 48.7 V I22
2021-04-09 00:36:06 C 08 05 25.58 +14 55 50.0 V I22
2021-04-09 00:36:44 C 08 05 25.57 +14 55 49.6 V I22
2021-04-09 00:37:23 C 08 05 25.51 +14 55 51.0 V I22
2021-04-09 00:38:02 C 08 05 25.50 +14 55 51.9 V I22
2021-04-09 00:38:41 C 08 05 25.45 +14 55 52.8 V I22
2021-04-09 00:39:21 C 08 05 25.48 +14 55 53.6 V I22
2021-04-09 00:40:00 C 08 05 25.46 +14 55 54.3 V I22
2021-04-09 00:40:38 C 08 05 25.41 +14 55 54.6 V I22
2021-04-09 00:41:17 C 08 05 25.38 +14 55 55.3 V I22
2021-04-09 00:42:01 C 08 05 25.38 +14 55 56.4 V I22
2021-04-09 00:42:40 C 08 05 25.34 +14 55 57.0 V I22
2021-04-09 00:43:18 C 08 05 25.27 +14 55 57.6 V I22
2021-04-09 00:43:57 C 08 05 25.29 +14 55 58.4 V I22
2021-04-09 00:44:36 C 08 05 25.24 +14 55 58.8 V I22
2021-04-09 00:45:16 C 08 05 25.26 +14 55 59.5 V I22
2021-04-09 00:45:55 C 08 05 25.19 +14 56 00.9 V I22
2021-04-09 00:46:34 C 08 05 25.18 +14 56 01.2 V I22
2021-04-09 00:47:13 C 08 05 25.14 +14 56 01.7 V I22
2021-04-09 00:47:51 C 08 05 25.14 +14 56 02.7 V I22
2021-04-09 00:49:08 C 08 05 25.07 +14 56 04.1 V I22
2021-04-09 00:51:06 C 08 05 24.98 +14 56 06.2 V I22
2021-04-09 01:22:59 C 08 05 25.10 +14 56 51.7 q H45
2021-04-09 01:25:45 C 08 05 24.98 +14 56 55.5 q H45
2021-04-09 01:28:17 C 08 05 24.80 +14 56 58.1 q H45
2021-04-09 01:31:04 C 08 05 24.72 +14 57 01.0 q H45
2021-04-09 01:34:12 C 08 05 24.59 +14 57 04.7 q H45
2021-04-09 01:36:19 C 08 05 24.53 +14 57 07.1 q H45
2021-04-09 02:51:57 C 08 05 22.33 +14 58 34.3 o 691
2021-04-09 03:25:25 C 08 05 20.88 +14 59 11.1 o 691
2021-04-09 03:56:41 C 08 05 19.56 +14 59 45.4 o 691
2021-04-09 04:01:11 C 08 05 19.36 +14 59 49.7 V 703
2021-04-09 04:09:24 C 08 05 19.01 +14 59 58.2 V 703
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)