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
2013-03-14 18:48:50 C 06 54 46.13 +12 21 16.7 r 168
2013-03-14 19:27:35 C 06 54 48.73 +12 21 52.1 q B88
2013-03-14 19:58:30 C 06 54 49.10 +12 22 03.8 r 168
2013-03-14 20:09:37 C 06 54 50.34 +12 22 21.1 q B88
2013-03-14 20:41:06 C 06 54 51.59 +12 22 42.3 q B88
2013-03-15 20:30:05 C 06 55 58.86 +12 39 02.9 q B88
2013-03-15 20:41:09 C 06 55 59.35 +12 39 10.3 q B88
2013-03-15 21:20:39 C 06 56 00.88 +12 39 36.2 q B88
2013-03-16 11:19:02 C 06 56 42.24 +12 49 04.2 o 300
2013-03-16 11:21:36 C 06 56 42.39 +12 49 06.3 o 300
2013-03-16 11:23:58 C 06 56 42.48 +12 49 08.2 o 300
2013-03-16 11:26:20 C 06 56 42.60 +12 49 09.6 o 300
2013-03-16 11:28:44 C 06 56 42.68 +12 49 10.7 o 300
2013-03-16 11:31:06 C 06 56 42.79 +12 49 12.9 o 300
2013-03-16 11:33:29 C 06 56 42.88 +12 49 14.3 o 300
2013-03-16 11:35:51 C 06 56 42.98 +12 49 15.6 o 300
2013-03-17 02:04:49 C 06 57 26.42 +12 58 47.6 q H45
2013-03-17 02:07:33 C 06 57 26.55 +12 58 49.3 q H45
2013-03-17 02:09:21 C 06 57 26.58 +12 58 50.9 q H45
2013-03-17 02:10:34 C 06 57 26.65 +12 58 51.3 q H45
2013-03-17 02:12:03 C 06 57 26.72 +12 58 52.5 q H45
2013-03-17 02:13:45 C 06 57 26.79 +12 58 53.6 q H45
2013-03-18 08:04:07 C 06 58 57.552 +13 18 08.56 t F65
2013-03-18 08:07:08 C 06 58 57.682 +13 18 10.36 t F65
2013-03-20 02:18:53 C 07 01 14.43 +13 43 54.0 u H21
2013-03-20 02:31:39 C 07 01 15.03 +13 44 01.3 u H21
2013-03-20 02:38:07 C 07 01 15.34 +13 44 05.2 u H21
2013-03-20 02:44:35 C 07 01 15.65 +13 44 09.0 u H21
2013-03-22 02:57:32 C 07 03 59.24 +14 12 08.8 u H21
2013-03-22 03:10:13 C 07 03 59.88 +14 12 15.5 u H21
2013-03-22 03:16:32 C 07 04 00.21 +14 12 19.2 u H21
2013-03-22 03:22:51 C 07 04 00.54 +14 12 22.6 u H21
2013-03-28 01:50:21 C 07 12 49.23 +15 26 06.7 u H21
2013-03-28 01:56:29 C 07 12 49.59 +15 26 09.3 u H21
2013-03-28 02:02:50 C 07 12 49.95 +15 26 12.4 u H21
2013-03-28 02:08:58 C 07 12 50.31 +15 26 15.1 u H21
2013-03-31 01:09:32 C 07 17 34.32 +15 58 23.2 o 924
2013-03-31 01:10:47 C 07 17 34.44 +15 58 24.2 o 924
2013-03-31 01:12:01 C 07 17 34.47 +15 58 24.8 o 924
2013-03-31 01:15:46 C 07 17 34.75 +15 58 26.7 o 924
2013-03-31 01:19:32 C 07 17 34.95 +15 58 27.4 o 924
2013-03-31 01:22:02 C 07 17 35.15 +15 58 29.6 o 924
2013-03-31 01:23:18 C 07 17 35.18 +15 58 29.3 o 924
2013-03-31 01:27:02 C 07 17 35.43 +15 58 32.2 o 924
2013-04-01 02:41:04 C 07 19 19.16 +16 09 22.6 q H45
2013-04-01 02:43:18 C 07 19 19.29 +16 09 23.5 q H45
2013-04-01 02:45:09 C 07 19 19.43 +16 09 24.0 q H45
2013-04-01 02:46:39 C 07 19 19.56 +16 09 25.1 q H45
2013-04-01 02:49:01 C 07 19 19.64 +16 09 25.6 q H45
2013-04-01 02:50:06 C 07 19 19.73 +16 09 26.3 q H45
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)