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
2021-02-23 00:32:17 C 10 17 17.37 -15 04 49.6 V Z80
2021-02-23 10:20:28 C 10 15 26.63 -14 51 19.9 V T08
2021-02-23 10:56:28 C 10 15 19.04 -14 50 31.2 V T08
2021-02-23 11:32:11 C 10 15 11.54 -14 49 42.2 V T08
2021-02-23 12:07:57 C 10 15 04.04 -14 48 52.7 V T08
2021-02-23 14:54:05 S 10 16 30.024 -14 33 45.22 V C57
2021-02-23 14:54:05 s 1 +154780.08 2 +84764.301 6630.0 C57
2021-02-23 15:04:05 S 10 16 28.922 -14 33 32.72 V C57
2021-02-23 15:04:05 s 1 +154934.10 9 +85746.851 3090.0 C57
2021-02-23 15:14:05 S 10 16 27.739 -14 33 19.51 V C57
2021-02-23 15:14:05 s 1 +155084.30 2 +86727.272 2030.0 C57
2021-02-23 15:34:05 S 10 16 25.466 -14 32 53.48 V C57
2021-02-23 15:34:05 s 1 +155373.32 4 +88681.719 7630.0 C57
2021-02-23 15:44:05 S 10 16 24.235 -14 32 42.65 V C57
2021-02-23 15:44:05 s 1 +155512.22 1 +89655.739 4420.0 C57
2021-02-23 16:04:05 S 10 16 22.138 -14 32 14.32 V C57
2021-02-23 16:04:05 s 1 +155778.95 7 +91597.363 6300.0 C57
2021-02-23 16:14:05 S 10 16 20.969 -14 32 01.39 V C57
2021-02-23 16:14:05 s 1 +155906.86 1 +92564.963 1510.0 C57
2021-02-23 16:24:05 S 10 16 19.776 -14 31 47.82 V C57
2021-02-23 16:24:05 s 1 +156031.16 7 +93530.419 9660.0 C57
2021-02-23 16:44:05 S 10 16 17.470 -14 31 21.65 V C57
2021-02-23 16:44:05 s 1 +156269.10 8 +95454.896 5000.0 C57
2021-02-23 17:04:05 S 10 16 15.084 -14 30 56.09 V C57
2021-02-23 17:04:05 s 1 +156493.03 2 +97370.784 2810.0 C57
2021-02-23 17:14:05 S 10 16 14.069 -14 30 42.98 V C57
2021-02-23 17:14:05 s 1 +156599.81 5 +98325.505 6530.0 C57
2021-02-23 17:24:05 S 10 16 12.859 -14 30 30.10 V C57
2021-02-23 17:24:05 s 1 +156703.18 5 +99278.077 3550.0 C57
2021-02-23 17:34:05 S 10 16 11.652 -14 30 17.68 V C57
2021-02-23 17:34:05 s 1 +156803.17 3 +100228.50 3910.0 C57
2021-02-23 17:44:05 S 10 16 10.471 -14 30 03.38 V C57
2021-02-23 17:44:05 s 1 +156899.80 8 +101176.77 7680.0 C57
2021-02-23 18:04:05 S 10 16 08.088 -14 29 38.36 V C57
2021-02-23 18:04:05 s 1 +157083.13 5 +103066.86 5670.0 C57
2021-02-23 18:14:05 S 10 16 06.991 -14 29 25.30 V C57
2021-02-23 18:14:05 s 1 +157169.88 4 +104008.68 9990.0 C57
2021-02-23 18:24:05 S 10 16 05.822 -14 29 14.10 V C57
2021-02-23 18:24:05 s 1 +157253.39 5 +104948.36 7940.0 C57
2021-02-23 18:34:05 S 10 16 04.644 -14 29 00.42 V C57
2021-02-23 18:34:05 s 1 +157333.69 6 +105885.88 9560.0 C57
2021-02-23 18:44:05 S 10 16 03.427 -14 28 46.60 V C57
2021-02-23 18:44:05 s 1 +157410.81 4 +106821.25 4920.0 C57
2021-02-23 19:04:05 S 10 16 01.003 -14 28 20.82 V C57
2021-02-23 19:04:05 s 1 +157555.60 9 +108685.56 7050.0 C57
2021-02-23 19:14:05 S 10 15 59.815 -14 28 07.32 V C57
2021-02-23 19:14:05 s 1 +157623.34 0 +109614.49 3920.0 C57
2021-02-23 19:24:05 S 10 15 58.586 -14 27 55.62 V C57
2021-02-23 19:24:05 s 1 +157687.99 5 +110541.27 4730.0 C57
2021-02-23 19:34:05 S 10 15 57.427 -14 27 42.77 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)