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
2021-03-17 20:14:03 C 08 42 21.72 +01 46 38.7 V L47
2021-03-17 20:15:10 C 08 42 21.57 +01 46 41.0 V L47
2021-03-17 20:25:38 C 08 42 20.81 +01 46 54.0 V Z80
2021-03-17 20:46:10 C 08 42 17.99 +01 47 33.1 V Z80
2021-03-17 20:58:27 C 08 42 16.31 +01 47 56.1 V Z80
2021-03-17 21:00:01 C 08 42 16.24 +01 48 11.6 V I79
2021-03-17 21:10:09 C 08 42 14.81 +01 48 30.8 V I79
2021-03-17 21:17:11 C 08 42 13.73 +01 48 31.3 V Z80
2021-03-17 21:20:25 C 08 42 13.36 +01 48 50.3 V I79
2021-03-17 21:30:55 C 08 42 11.89 +01 49 10.1 V I79
2021-03-17 21:41:00 C 08 42 10.48 +01 49 29.3 V I79
2021-03-17 21:51:07 C 08 42 09.06 +01 49 48.3 V I79
2021-03-17 22:37:17 C 08 42 02.84 +01 51 05.5 V Z43
2021-03-17 22:46:24 C 08 42 01.62 +01 51 22.9 V Z43
2021-03-17 22:55:14 C 08 42 00.40 +01 51 39.6 V Z43
2021-03-18 00:12:07 C 08 41 54.78 +01 54 58.3 H78
2021-03-18 00:24:38 C 08 41 52.88 +01 55 22.9 H78
2021-03-18 09:32:43 C 08 40 43.80 +02 13 20.7 q E89
2021-03-18 09:49:31 C 08 40 41.50 +02 13 52.5 q E89
2021-03-18 11:18:03 C 08 40 31.79 +02 15 09.0 q Q21
2021-03-18 11:24:06 C 08 40 30.97 +02 15 20.4 q Q21
2021-03-18 11:31:39 C 08 40 29.93 +02 15 34.8 q Q21
2021-03-18 15:54:13 C 08 39 58.30 +02 23 38.9 Y N42
2021-03-18 15:55:30 C 08 39 58.13 +02 23 41.3 Y N42
2021-03-18 15:56:48 C 08 39 57.96 +02 23 43.8 Y N42
2021-03-18 15:58:06 C 08 39 57.79 +02 23 46.2 Y N42
2021-03-18 15:59:24 C 08 39 57.62 +02 23 48.6 Y N42
2021-03-18 16:00:40 C 08 39 57.44 +02 23 51.0 Y N42
2021-03-18 16:01:58 C 08 39 57.26 +02 23 53.4 Y N42
2021-03-18 16:03:16 C 08 39 57.09 +02 23 55.9 Y N42
2021-03-18 16:04:33 C 08 39 56.91 +02 23 58.4 Y N42
2021-03-18 16:05:51 C 08 39 56.75 +02 24 00.6 Y N42
2021-03-18 16:07:08 C 08 39 56.57 +02 24 03.0 Y N42
2021-03-18 20:16:04 C 08 39 27.25 +02 31 46.1 q L47
2021-03-18 20:32:04 C 08 39 25.01 +02 32 16.0 q L47
2021-03-18 21:25:56 C 08 39 17.55 +02 33 52.0 q 056
2021-03-18 21:31:07 C 08 39 16.98 +02 34 00.7 q 056
2021-03-18 21:36:19 C 08 39 16.32 +02 34 09.8 q 056
2021-03-18 21:57:03 C 08 39 13.60 +02 34 49.4 q 056
2021-03-18 22:02:15 C 08 39 13.00 +02 34 59.4 q 056
2021-03-18 22:12:37 C 08 39 11.68 +02 35 18.6 q 056
2021-03-18 22:17:48 C 08 39 10.96 +02 35 27.2 q 056
2021-03-18 22:22:59 C 08 39 10.30 +02 35 36.9 q 056
2021-03-18 22:28:09 C 08 39 09.62 +02 35 45.7 q 056
2021-03-18 22:33:19 C 08 39 08.99 +02 35 55.7 q 056
2021-03-18 22:38:30 C 08 39 08.33 +02 36 05.2 q 056
2021-03-18 22:43:41 C 08 39 07.72 +02 36 15.9 q 056
2021-03-18 22:48:52 C 08 39 06.99 +02 36 24.8 q 056
2021-03-18 22:54:02 C 08 39 06.26 +02 36 35.5 q 056
2021-03-18 22:59:13 C 08 39 05.68 +02 36 44.3 q 056
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)