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
2021-03-07 18:22:30 C 09 19 11.01 -06 15 46.2 q 168
2021-03-07 18:27:29 C 09 19 11.33 -06 15 26.9 V C40
2021-03-07 18:38:30 C 09 19 07.96 -06 15 14.0 q 168
2021-03-07 18:46:36 C 09 19 07.64 -06 14 48.6 V C40
2021-03-07 18:48:10 C 09 19 07.35 -06 14 45.5 V C40
2021-03-07 18:48:29 C 09 19 06.08 -06 14 54.0 q 168
2021-03-07 18:49:41 C 09 19 07.05 -06 14 42.4 V C40
2021-03-07 18:58:30 C 09 19 04.18 -06 14 33.8 q 168
2021-03-07 19:20:40 C 09 19 01.06 -06 13 40.4 V C40
2021-03-07 19:22:11 C 09 19 00.76 -06 13 37.2 V C40
2021-03-07 19:28:27 C 09 19 00.53 -06 13 25.0 V L54
2021-03-07 19:29:59 C 09 18 59.59 -06 13 21.6 V 094
2021-03-07 19:30:05 C 09 19 02.19 -06 13 11.8 V J37
2021-03-07 19:48:42 C 09 18 58.65 -06 12 35.2 V J37
2021-03-07 20:17:08 C 09 18 53.20 -06 11 38.6 V J37
2021-03-07 20:29:04 C 09 18 50.90 -06 11 14.5 V J37
2021-03-07 20:35:03 C 09 18 49.75 -06 11 02.7 V J37
2021-03-07 20:41:02 C 09 18 48.62 -06 10 50.7 V J37
2021-03-07 20:43:07 C 09 18 46.87 -06 10 58.6 V K87
2021-03-07 20:48:27 C 09 18 47.20 -06 10 35.9 V J37
2021-03-07 20:48:50 C 09 18 45.79 -06 10 47.2 V K87
2021-03-07 20:58:23 C 09 18 43.95 -06 10 27.9 V K87
2021-03-07 20:58:57 C 09 18 44.15 -06 10 21.3 v A77
2021-03-07 21:11:45 C 09 18 39.93 -06 09 56.6 V 094
2021-03-07 21:12:36 C 09 18 40.44 -06 09 56.3 V L54
2021-03-07 21:18:18 C 09 18 40.42 -06 09 42.6 v A77
2021-03-07 21:28:18 C 09 18 38.48 -06 09 22.6 v A77
2021-03-07 21:38:18 C 09 18 36.55 -06 09 02.5 v A77
2021-03-07 22:56:43 C 09 18 20.51 -06 06 25.9 V L54
2021-03-08 00:16:38 C 09 18 11.06 -06 03 40.7 S 932
2021-03-08 00:29:10 C 09 18 08.68 -06 03 16.0 S 932
2021-03-08 00:45:57 C 09 18 05.48 -06 02 42.3 S 932
2021-03-08 02:46:16 C 09 17 42.80 -05 58 35.7 V W50
2021-03-08 02:49:12 C 09 17 42.19 -05 58 29.6 V W50
2021-03-08 02:50:41 C 09 17 41.91 -05 58 26.8 V W50
2021-03-08 02:57:57 C 09 17 40.47 -05 58 11.9 V W50
2021-03-08 02:59:59 C 09 17 40.13 -05 58 08.0 V W50
2021-03-08 03:01:46 C 09 17 39.79 -05 58 04.5 V W50
2021-03-08 03:04:38 C 09 17 39.22 -05 57 58.7 V W50
2021-03-08 03:07:18 C 09 17 38.69 -05 57 53.3 V W50
2021-03-08 03:08:52 C 09 17 38.41 -05 57 50.4 V W50
2021-03-08 03:10:20 C 09 17 38.10 -05 57 47.2 V W50
2021-03-08 03:11:47 C 09 17 37.81 -05 57 44.3 V W50
2021-03-08 03:13:15 C 09 17 37.52 -05 57 41.3 V W50
2021-03-08 03:14:44 C 09 17 37.25 -05 57 38.5 V W50
2021-03-08 03:16:28 C 09 17 36.89 -05 57 34.8 V W50
2021-03-08 03:18:02 C 09 17 36.58 -05 57 31.7 V W50
2021-03-08 05:02:03 C 09 17 18.48 -05 53 49.9 16.0 Y V26
2021-03-08 05:17:26 C 09 17 15.44 -05 53 18.9 16.2 Y V26
2021-03-08 05:42:38 C 09 17 10.51 -05 52 28.1 16.2 Y V26
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)