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 Period	0.88586012 yr ± 4.32e+00
NGA Model	r2
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

Source	IAA
Solution Date	2026-04-29
RMS Residual	0.213″
Uncertainty	0
Orbit Type	Aten
MOID	0.000007 AU
Observations Used	8720
Oppositions	2
Arc Total	2004-2021
First Observation Used	2004-03-15
Last Observation Used	2021-05-20

Observations (10797)

Date	Type	RA	Dec	Mag	Band	Observatory
2021-03-02 07:44:05	S	09 46 33.274	-10 41 25.69	–	V	C57
2021-03-02 07:44:05	s	1 -120792.50	6 +344990.77	4940.0	–	C57
2021-03-02 07:54:05	S	09 46 30.965	-10 41 09.06	–	V	C57
2021-03-02 07:54:05	s	1 -121101.64	0 +344728.81	9710.0	–	C57
2021-03-02 08:04:05	S	09 46 28.666	-10 40 52.18	–	V	C57
2021-03-02 08:04:05	s	1 -121410.41	6 +344465.84	3900.0	–	C57
2021-03-02 08:14:05	S	09 46 26.393	-10 40 35.15	–	V	C57
2021-03-02 08:14:05	s	1 -121718.83	4 +344201.86	7480.0	–	C57
2021-03-02 08:24:05	S	09 46 24.178	-10 40 17.11	–	V	C57
2021-03-02 08:24:05	s	1 -122026.89	3 +343936.86	480.0	–	C57
2021-03-02 08:34:05	S	09 46 21.890	-10 39 59.11	–	V	C57
2021-03-02 08:34:05	s	1 -122334.59	1 +343670.85	2870.0	–	C57
2021-03-02 08:44:05	S	09 46 19.524	-10 39 41.90	–	V	C57
2021-03-02 08:44:05	s	1 -122641.92	7 +343403.83	4660.0	–	C57
2021-03-02 08:54:05	S	09 46 17.249	-10 39 24.91	–	V	C57
2021-03-02 08:54:05	s	1 -122948.90	0 +343135.79	5840.0	–	C57
2021-03-02 09:14:05	S	09 46 12.703	-10 38 50.32	–	V	C57
2021-03-02 09:14:05	s	1 -123561.74	9 +342596.67	6400.0	–	C57
2021-03-02 09:24:05	S	09 46 10.392	-10 38 31.63	–	V	C57
2021-03-02 09:24:05	s	1 -123867.62	2 +342325.58	5760.0	–	C57
2021-03-02 09:34:05	S	09 46 08.078	-10 38 14.86	–	V	C57
2021-03-02 09:34:05	s	1 -124173.12	8 +342053.48	4500.0	–	C57
2021-03-02 09:44:05	S	09 46 05.791	-10 37 58.08	–	V	C57
2021-03-02 09:44:05	s	1 -124478.26	2 +341780.37	2630.0	–	C57
2021-03-02 09:54:05	S	09 46 03.540	-10 37 41.09	–	V	C57
2021-03-02 09:54:05	s	1 -124783.02	6 +341506.24	140.0	–	C57
2021-03-02 10:04:05	S	09 46 01.272	-10 37 23.41	–	V	C57
2021-03-02 10:04:05	s	1 -125087.41	6 +341231.09	7030.0	–	C57
2021-03-02 10:14:05	S	09 45 58.966	-10 37 04.73	–	V	C57
2021-03-02 10:14:05	s	1 -125391.43	3 +340954.92	3290.0	–	C57
2021-03-02 10:24:05	S	09 45 56.662	-10 36 47.45	–	V	C57
2021-03-02 10:24:05	s	1 -125695.07	3 +340677.73	8930.0	–	C57
2021-03-02 10:34:05	S	09 45 54.370	-10 36 30.67	–	V	C57
2021-03-02 10:34:05	s	1 -125998.33	7 +340399.53	3940.0	–	C57
2021-03-02 10:44:05	S	09 45 52.109	-10 36 13.90	–	V	C57
2021-03-02 10:44:05	s	1 -126301.22	3 +340120.31	8310.0	–	C57
2021-03-02 10:54:05	S	09 45 49.781	-10 35 56.36	–	V	C57
2021-03-02 10:54:05	s	1 -126603.72	8 +339840.07	2050.0	–	C57
2021-03-02 11:04:05	S	09 45 47.525	-10 35 38.08	–	V	C57
2021-03-02 11:04:05	s	1 -126905.85	3 +339558.81	5160.0	–	C57
2021-03-02 11:14:05	S	09 45 45.154	-10 35 19.75	–	V	C57
2021-03-02 11:14:05	s	1 -127207.59	5 +339276.53	7620.0	–	C57
2021-03-02 11:24:05	S	09 45 42.902	-10 35 02.98	–	V	C57
2021-03-02 11:24:05	s	1 -127508.95	3 +338993.23	9450.0	–	C57
2021-03-02 11:34:05	S	09 45 40.601	-10 34 46.31	–	V	C57
2021-03-02 11:34:05	s	1 -127809.92	6 +338708.90	630.0	–	C57
2021-03-02 12:04:05	S	09 45 33.689	-10 33 52.06	–	V	C57
2021-03-02 12:04:05	s	1 -128710.52	0 +337849.81	270.0	–	C57
2021-03-02 12:14:05	S	09 45 31.433	-10 33 34.81	–	V	C57
2021-03-02 12:14:05	s	1 -129009.93	8 +337561.40	8840.0	–	C57

« Prev 1 2 … 151 152 153 … 215 216 Next » 10797 observations

Radar Observations (50)

Epoch (UTC)	Value	Sigma	Units	Freq (MHz)	Receiver	Transmitter
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)