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
2021-03-02 22:30:06 C 09 40 40.25 -10 00 26.8 V G33
2021-03-02 22:31:10 C 09 40 39.27 -10 00 23.7 q 056
2021-03-02 22:31:50 C 09 40 39.90 -10 00 23.8 V G33
2021-03-02 22:33:29 C 09 40 39.57 -10 00 20.7 V G33
2021-03-02 22:34:05 S 09 43 08.170 -10 15 13.97 V C57
2021-03-02 22:34:05 s 1 -146748.83 2 +317662.35 5370.0 C57
2021-03-02 22:35:10 C 09 40 39.20 -10 00 17.8 V G33
2021-03-02 22:36:51 C 09 40 38.86 -10 00 14.7 V G33
2021-03-02 22:44:05 S 09 43 05.856 -10 14 56.47 V C57
2021-03-02 22:44:05 s 1 -147020.58 6 +317308.49 6970.0 C57
2021-03-02 22:51:41 C 09 40 34.85 -09 59 42.7 V L54
2021-03-02 22:54:05 S 09 43 03.538 -10 14 39.34 V C57
2021-03-02 22:54:05 s 1 -147291.84 9 +316953.58 7730.0 C57
2021-03-02 23:04:05 S 09 43 01.217 -10 14 20.69 V C57
2021-03-02 23:04:05 s 1 -147562.61 9 +316597.61 7650.0 C57
2021-03-02 23:14:05 S 09 42 58.896 -10 14 01.86 V C57
2021-03-02 23:14:05 s 1 -147832.89 5 +316240.58 6710.0 C57
2021-03-02 23:24:05 S 09 42 56.566 -10 13 43.82 V C57
2021-03-02 23:24:05 s 1 -148102.67 4 +315882.49 4930.0 C57
2021-03-02 23:32:05 C 09 40 26.49 -09 58 26.6 V L54
2021-03-02 23:34:05 S 09 42 54.235 -10 13 26.72 V C57
2021-03-02 23:34:05 s 1 -148371.95 6 +315523.34 2280.0 C57
2021-03-02 23:44:05 S 09 42 51.871 -10 13 09.12 V C57
2021-03-02 23:44:05 s 1 -148640.73 7 +315163.14 8780.0 C57
2021-03-02 23:54:05 S 09 42 49.570 -10 12 50.83 V C57
2021-03-02 23:54:05 s 1 -148909.01 7 +314801.87 4410.0 C57
2021-03-02 23:59:25 C 09 40 20.89 -09 57 36.0 V L54
2021-03-03 00:04:05 S 09 42 47.282 -10 12 31.18 V C57
2021-03-03 00:04:05 s 1 -149176.79 4 +314439.54 9180.0 C57
2021-03-03 00:14:05 S 09 42 44.914 -10 12 13.82 V C57
2021-03-03 00:14:05 s 1 -149444.06 5 +314076.15 3080.0 C57
2021-03-03 00:24:05 S 09 42 42.598 -10 11 56.22 V C57
2021-03-03 00:24:05 s 1 -149710.83 0 +313711.69 6110.0 C57
2021-03-03 00:34:05 S 09 42 40.246 -10 11 38.98 V C57
2021-03-03 00:34:05 s 1 -149977.08 6 +313346.18 8260.0 C57
2021-03-03 00:44:05 S 09 42 37.949 -10 11 20.22 V C57
2021-03-03 00:44:05 s 1 -150242.83 1 +312979.59 9520.0 C57
2021-03-03 00:54:05 S 09 42 35.647 -10 11 01.14 V C57
2021-03-03 00:54:05 s 1 -150508.06 3 +312611.95 9910.0 C57
2021-03-03 01:04:05 S 09 42 33.322 -10 10 42.89 V C57
2021-03-03 01:04:05 s 1 -150772.78 2 +312243.24 9410.0 C57
2021-03-03 01:11:04 C 09 40 11.33 -09 53 48.5 q 834
2021-03-03 01:14:05 S 09 42 30.998 -10 10 26.08 V C57
2021-03-03 01:14:05 s 1 -151036.98 4 +311873.46 8020.0 C57
2021-03-03 01:24:05 S 09 42 28.579 -10 10 08.44 V C57
2021-03-03 01:24:05 s 1 -151300.66 8 +311502.61 5740.0 C57
2021-03-03 01:34:05 S 09 42 26.268 -10 09 49.39 V C57
2021-03-03 01:34:05 s 1 -151563.83 3 +311130.70 2560.0 C57
2021-03-03 01:39:45 C 09 40 05.32 -09 52 55.8 q 834
2021-03-03 01:44:05 S 09 42 23.954 -10 09 30.31 V C57
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)