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
2021-02-28 04:34:05	S	09 57 46.121	-12 04 55.27	–	V	C57
2021-02-28 04:34:05	s	1 -14479.455	0 +378476.74	3420.0	–	C57
2021-02-28 04:44:05	S	09 57 43.980	-12 04 39.61	–	V	C57
2021-02-28 04:44:05	s	1 -14846.917	0 +378519.43	7680.0	–	C57
2021-02-28 04:54:05	S	09 57 41.933	-12 04 23.99	–	V	C57
2021-02-28 04:54:05	s	1 -15214.337	0 +378561.11	8780.0	–	C57
2021-02-28 05:04:05	S	09 57 39.854	-12 04 07.97	–	V	C57
2021-02-28 05:04:05	s	1 -15581.716	0 +378601.79	9870.0	–	C57
2021-02-28 05:14:05	S	09 57 37.745	-12 03 52.49	–	V	C57
2021-02-28 05:14:05	s	1 -15949.050	0 +378641.45	950.0	–	C57
2021-02-28 05:24:05	S	09 57 35.681	-12 03 38.38	–	V	C57
2021-02-28 05:24:05	s	1 -16316.341	0 +378680.11	2030.0	–	C57
2021-02-28 05:34:05	S	09 57 33.566	-12 03 23.15	–	V	C57
2021-02-28 05:34:05	s	1 -16683.587	0 +378717.76	3090.0	–	C57
2021-02-28 05:44:05	S	09 57 31.462	-12 03 07.99	–	V	C57
2021-02-28 05:44:05	s	1 -17050.786	0 +378754.40	4150.0	–	C57
2021-02-28 05:54:05	S	09 57 29.431	-12 02 51.83	–	V	C57
2021-02-28 05:54:05	s	1 -17417.939	0 +378790.04	5180.0	–	C57
2021-02-28 06:04:05	S	09 57 27.314	-12 02 35.88	–	V	C57
2021-02-28 06:04:05	s	1 -17785.043	0 +378824.66	6210.0	–	C57
2021-02-28 06:14:05	S	09 57 25.253	-12 02 20.90	–	V	C57
2021-02-28 06:14:05	s	1 -18152.099	0 +378858.28	7210.0	–	C57
2021-02-28 06:24:05	S	09 57 23.138	-12 02 06.14	–	V	C57
2021-02-28 06:24:05	s	1 -18519.104	0 +378890.90	8190.0	–	C57
2021-02-28 06:34:05	S	09 57 20.990	-12 01 50.95	–	V	C57
2021-02-28 06:34:05	s	1 -18886.059	0 +378922.51	9160.0	–	C57
2021-02-28 06:44:05	S	09 57 18.919	-12 01 35.80	–	V	C57
2021-02-28 06:44:05	s	1 -19252.961	0 +378953.11	100.0	–	C57
2021-02-28 06:54:05	S	09 57 16.841	-12 01 19.56	–	V	C57
2021-02-28 06:54:05	s	1 -19619.811	0 +378982.71	1010.0	–	C57
2021-02-28 07:04:05	S	09 57 14.760	-12 01 03.90	–	V	C57
2021-02-28 07:04:05	s	1 -19986.608	0 +379011.30	1900.0	–	C57
2021-02-28 07:14:05	S	09 57 12.682	-12 00 48.85	–	V	C57
2021-02-28 07:14:05	s	1 -20353.349	0 +379038.89	2760.0	–	C57
2021-02-28 07:24:05	S	09 57 10.526	-12 00 33.73	–	V	C57
2021-02-28 07:24:05	s	1 -20720.035	0 +379065.47	3590.0	–	C57
2021-02-28 07:34:05	S	09 57 08.443	-12 00 19.01	–	V	C57
2021-02-28 07:34:05	s	1 -21086.665	0 +379091.05	4390.0	–	C57
2021-02-28 07:44:05	S	09 57 06.350	-12 00 03.49	–	V	C57
2021-02-28 07:44:05	s	1 -21453.236	0 +379115.62	5150.0	–	C57
2021-02-28 07:54:05	S	09 57 04.238	-11 59 46.82	–	V	C57
2021-02-28 07:54:05	s	1 -21819.750	0 +379139.20	5880.0	–	C57
2021-02-28 08:04:05	S	09 57 02.170	-11 59 31.38	–	V	C57
2021-02-28 08:04:05	s	1 -22186.204	0 +379161.77	6570.0	–	C57
2021-02-28 08:14:05	S	09 57 00.055	-11 59 16.22	–	V	C57
2021-02-28 08:14:05	s	1 -22552.597	0 +379183.33	7220.0	–	C57
2021-02-28 08:24:05	S	09 56 57.953	-11 59 01.25	–	V	C57
2021-02-28 08:24:05	s	1 -22918.930	0 +379203.90	7830.0	–	C57
2021-02-28 08:34:05	S	09 56 55.843	-11 58 46.06	–	V	C57
2021-02-28 08:34:05	s	1 -23285.200	0 +379223.46	8390.0	–	C57

« Prev 1 2 … 140 141 142 … 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)