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
2021-03-06 01:16:58 C 09 26 38.08 -07 37 21.6 V I22
2021-03-06 01:17:26 C 09 26 37.98 -07 37 20.7 V I22
2021-03-06 01:17:56 C 09 26 37.87 -07 37 19.5 V I22
2021-03-06 01:18:26 C 09 26 37.79 -07 37 18.9 V I22
2021-03-06 01:18:54 C 09 26 37.71 -07 37 17.9 V I22
2021-03-06 01:19:24 C 09 26 37.59 -07 37 16.9 V I22
2021-03-06 01:19:54 C 09 26 37.48 -07 37 16.1 V I22
2021-03-06 01:20:23 C 09 26 37.40 -07 37 14.9 V I22
2021-03-06 01:20:53 C 09 26 37.29 -07 37 14.0 V I22
2021-03-06 01:21:24 C 09 26 37.19 -07 37 13.1 V I22
2021-03-06 01:21:52 C 09 26 37.10 -07 37 12.0 V I22
2021-03-06 01:22:22 C 09 26 37.00 -07 37 11.1 V I22
2021-03-06 01:22:52 C 09 26 36.91 -07 37 10.1 V I22
2021-03-06 01:23:21 C 09 26 36.81 -07 37 09.1 V I22
2021-03-06 01:23:51 C 09 26 36.71 -07 37 08.2 V I22
2021-03-06 01:24:05 S 09 25 33.607 -07 46 57.47 V C57
2021-03-06 01:24:05 s 1 -168459.61 7 +38443.224 420.0 C57
2021-03-06 01:24:22 C 09 26 36.61 -07 37 07.2 V I22
2021-03-06 01:24:52 C 09 26 36.52 -07 37 06.2 V I22
2021-03-06 01:25:21 C 09 26 36.42 -07 37 05.3 V I22
2021-03-06 01:25:51 C 09 26 36.31 -07 37 04.1 V I22
2021-03-06 01:25:54 C 09 26 36.29 -07 37 03.8 V 851
2021-03-06 01:26:21 C 09 26 36.23 -07 37 03.3 V I22
2021-03-06 01:26:50 C 09 26 36.11 -07 37 02.5 V I22
2021-03-06 01:27:20 C 09 26 36.02 -07 37 01.5 V I22
2021-03-06 01:27:48 C 09 26 35.91 -07 37 00.3 V I22
2021-03-06 01:28:05 C 09 26 35.85 -07 37 00.2 V 851
2021-03-06 01:28:18 C 09 26 35.80 -07 36 59.5 V I22
2021-03-06 01:28:48 C 09 26 35.75 -07 36 58.6 V I22
2021-03-06 01:29:17 C 09 26 35.60 -07 36 57.7 V I22
2021-03-06 01:29:47 C 09 26 35.52 -07 36 56.6 V I22
2021-03-06 01:30:17 C 09 26 35.43 -07 36 55.6 V I22
2021-03-06 01:30:45 C 09 26 35.32 -07 36 54.7 V I22
2021-03-06 01:31:16 C 09 26 35.24 -07 36 53.7 V I22
2021-03-06 01:31:46 C 09 26 35.15 -07 36 52.7 V I22
2021-03-06 01:32:15 C 09 26 35.01 -07 36 51.8 V I22
2021-03-06 01:34:05 S 09 25 31.320 -07 46 36.23 V C57
2021-03-06 01:34:05 s 1 -168040.78 2 +37528.381 9250.0 C57
2021-03-06 01:44:05 S 09 25 29.122 -07 46 13.15 V C57
2021-03-06 01:44:05 s 1 -167617.46 3 +36612.540 9460.0 C57
2021-03-06 01:54:05 S 09 25 26.909 -07 45 51.66 V C57
2021-03-06 01:54:05 s 1 -167189.62 3 +35695.715 980.0 C57
2021-03-06 02:04:05 S 09 25 24.672 -07 45 28.84 V C57
2021-03-06 02:04:05 s 1 -166757.22 5 +34777.921 3740.0 C57
2021-03-06 02:14:05 S 09 25 22.435 -07 45 06.16 V C57
2021-03-06 02:14:05 s 1 -166320.23 3 +33859.171 7670.0 C57
2021-03-06 02:24:05 S 09 25 20.218 -07 44 44.16 V C57
2021-03-06 02:24:05 s 1 -165878.60 9 +32939.482 2680.0 C57
2021-03-06 02:34:05 S 09 25 18.036 -07 44 19.50 V C57
2021-03-06 02:34:05 s 1 -165432.31 6 +32018.870 8710.0 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)