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
2021-02-10 21:39:40 C 11 04 58.04 -19 05 53.3 V 186
2021-02-10 21:45:38 C 11 04 57.64 -19 05 57.8 q 168
2021-02-10 21:45:51 C 11 04 57.16 -19 05 50.8 V 186
2021-02-10 21:47:38 C 11 04 57.34 -19 05 57.3 q 168
2021-02-10 21:49:38 C 11 04 57.05 -19 05 56.7 q 168
2021-02-10 21:51:38 C 11 04 56.77 -19 05 56.4 q 168
2021-02-10 21:52:04 C 11 04 56.22 -19 05 48.3 V 186
2021-02-10 21:53:37 C 11 04 56.49 -19 05 55.6 q 168
2021-02-10 21:55:37 C 11 04 56.20 -19 05 55.2 q 168
2021-02-10 21:58:45 C 11 04 55.25 -19 05 45.9 V 186
2021-02-10 22:01:37 C 11 04 55.35 -19 05 52.4 q 168
2021-02-10 22:03:38 C 11 04 55.07 -19 05 51.5 q 168
2021-02-10 22:07:38 C 11 04 54.48 -19 05 49.9 q 168
2021-02-10 22:09:38 C 11 04 54.22 -19 05 49.6 q 168
2021-02-10 22:11:37 C 11 04 53.91 -19 05 48.6 q 168
2021-02-10 22:13:37 C 11 04 53.65 -19 05 47.9 q 168
2021-02-10 22:15:37 C 11 04 53.35 -19 05 47.5 q 168
2021-02-10 22:17:37 C 11 04 53.08 -19 05 46.5 q 168
2021-02-11 00:28:27 C 11 04 37.01 -19 04 54.7 V Z80
2021-02-11 00:35:07 C 11 04 36.06 -19 04 52.0 V Z80
2021-02-11 00:41:47 C 11 04 35.08 -19 04 50.0 V Z80
2021-02-11 00:48:22 C 11 04 34.11 -19 04 47.1 V Z80
2021-02-11 02:09:21 C 11 04 20.47 -19 04 08.6 V C40
2021-02-11 02:21:40 C 11 04 18.72 -19 04 03.7 V C40
2021-02-11 02:26:19 C 11 04 18.05 -19 04 01.8 V C40
2021-02-11 08:58:02 C 11 03 28.10 -19 01 26.2 V G96
2021-02-11 09:12:21 C 11 03 25.91 -19 01 19.5 V G96
2021-02-11 09:19:47 C 11 03 24.79 -19 01 16.4 V G96
2021-02-11 09:27:12 C 11 03 23.66 -19 01 13.4 V G96
2021-02-11 20:06:27 C 11 01 59.14 -18 56 46.5 V C40
2021-02-11 20:12:38 C 11 01 58.28 -18 56 43.1 V C40
2021-02-11 20:39:50 C 11 01 54.46 -18 56 31.4 V C40
2021-02-11 21:10:03 C 11 01 48.59 -18 56 28.1 q 168
2021-02-11 21:15:05 C 11 01 47.51 -18 56 18.9 V 186
2021-02-11 21:19:03 C 11 01 47.24 -18 56 24.4 q 168
2021-02-11 21:30:18 C 11 01 45.17 -18 56 11.9 V 186
2021-02-11 21:31:03 C 11 01 45.48 -18 56 18.7 q 168
2021-02-11 21:34:03 C 11 01 44.98 -18 56 17.3 q 168
2021-02-11 21:35:28 C 11 01 44.37 -18 56 09.5 V 186
2021-02-11 21:40:03 C 11 01 44.14 -18 56 15.5 q 168
2021-02-11 21:40:38 C 11 01 43.56 -18 56 07.3 V 186
2021-02-11 21:46:03 C 11 01 43.22 -18 56 12.5 q 168
2021-02-11 21:49:03 C 11 01 42.79 -18 56 11.9 q 168
2021-02-11 21:55:03 C 11 01 41.89 -18 56 08.5 q 168
2021-02-11 21:58:03 C 11 01 41.42 -18 56 06.8 q 168
2021-02-12 07:24:59 C 11 00 24.27 -18 51 36.0 V 703
2021-02-12 07:32:10 C 11 00 23.16 -18 51 33.0 V 703
2021-02-12 07:39:21 C 11 00 22.03 -18 51 29.7 V 703
2021-02-12 07:46:33 C 11 00 20.91 -18 51 26.6 V 703
2021-02-12 09:32:13 C 11 00 07.44 -18 50 24.5 V T05
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)