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
2021-03-04 10:24:05	S	09 34 41.554	-09 07 59.59	–	V	C57
2021-03-04 10:24:05	s	1 -190260.46	3 +215950.20	4640.0	–	C57
2021-03-04 10:34:05	S	09 34 39.132	-09 07 38.60	–	V	C57
2021-03-04 10:34:05	s	1 -190370.66	5 +215349.12	8940.0	–	C57
2021-03-04 10:44:05	S	09 34 36.821	-09 07 18.98	–	V	C57
2021-03-04 10:44:05	s	1 -190479.74	2 +214746.77	1180.0	–	C57
2021-03-04 10:54:05	S	09 34 34.382	-09 06 59.08	–	V	C57
2021-03-04 10:54:05	s	1 -190587.68	9 +214143.15	1360.0	–	C57
2021-03-04 11:04:05	S	09 34 31.994	-09 06 40.57	–	V	C57
2021-03-04 11:04:05	s	1 -190694.50	0 +213538.26	9480.0	–	C57
2021-03-04 11:14:05	S	09 34 29.635	-09 06 20.63	–	V	C57
2021-03-04 11:14:05	s	1 -190800.17	1 +212932.10	5520.0	–	C57
2021-03-04 11:24:05	S	09 34 27.305	-09 06 00.29	–	V	C57
2021-03-04 11:24:05	s	1 -190904.69	7 +212324.66	9460.0	–	C57
2021-03-04 11:34:05	S	09 34 24.936	-09 05 40.99	–	V	C57
2021-03-04 11:34:05	s	1 -191008.07	3 +211715.94	1320.0	–	C57
2021-03-04 11:44:05	S	09 34 22.572	-09 05 21.48	–	V	C57
2021-03-04 11:44:05	s	1 -191110.29	2 +211105.94	1060.0	–	C57
2021-03-04 11:54:05	S	09 34 20.162	-09 05 02.15	–	V	C57
2021-03-04 11:54:05	s	1 -191211.35	1 +210494.67	8680.0	–	C57
2021-03-04 12:04:05	S	09 34 17.760	-09 04 41.56	–	V	C57
2021-03-04 12:04:05	s	1 -191311.24	4 +209882.11	4180.0	–	C57
2021-03-04 12:24:05	S	09 34 12.986	-09 04 02.71	–	V	C57
2021-03-04 12:24:05	s	1 -191507.51	1 +208653.15	8750.0	–	C57
2021-03-04 12:34:05	S	09 34 10.589	-09 03 43.20	–	V	C57
2021-03-04 12:34:05	s	1 -191603.87	4 +208036.74	7800.0	–	C57
2021-03-04 12:44:05	S	09 34 08.251	-09 03 22.86	–	V	C57
2021-03-04 12:44:05	s	1 -191699.05	0 +207419.05	4690.0	–	C57
2021-03-04 12:54:05	S	09 34 05.890	-09 03 02.99	–	V	C57
2021-03-04 12:54:05	s	1 -191793.08	8 +206800.12	9190.0	–	C57
2021-03-04 13:04:05	S	09 34 03.466	-09 02 43.44	–	V	C57
2021-03-04 13:04:05	s	1 -191888.30	0 +206182.11	2950.0	–	C57
2021-03-04 13:14:05	S	09 34 01.090	-09 02 24.65	–	V	C57
2021-03-04 13:14:05	s	1 -191979.76	2 +205560.44	3740.0	–	C57
2021-03-04 13:24:05	S	09 33 58.733	-09 02 03.80	–	V	C57
2021-03-04 13:24:05	s	1 -192070.14	0 +204937.59	1870.0	–	C57
2021-03-04 13:34:05	S	09 33 56.357	-09 01 44.33	–	V	C57
2021-03-04 13:34:05	s	1 -192159.30	5 +204313.45	7770.0	–	C57
2021-03-04 13:44:05	S	09 33 53.969	-09 01 24.53	–	V	C57
2021-03-04 13:44:05	s	1 -192247.25	0 +203688.02	1440.0	–	C57
2021-03-04 13:54:05	S	09 33 51.593	-09 01 05.12	–	V	C57
2021-03-04 13:54:05	s	1 -192333.96	9 +203061.29	2870.0	–	C57
2021-03-04 14:04:05	S	09 33 49.195	-09 00 44.57	–	V	C57
2021-03-04 14:04:05	s	1 -192419.45	6 +202433.27	2040.0	–	C57
2021-03-04 14:14:05	S	09 33 46.829	-09 00 24.88	–	V	C57
2021-03-04 14:14:05	s	1 -192503.70	7 +201803.95	8950.0	–	C57
2021-03-04 14:24:05	S	09 33 44.450	-09 00 05.54	–	V	C57
2021-03-04 14:24:05	s	1 -192586.71	5 +201173.32	3590.0	–	C57
2021-03-04 14:34:05	S	09 33 42.041	-08 59 45.82	–	V	C57
2021-03-04 14:34:05	s	1 -192668.47	4 +200541.40	5940.0	–	C57

« Prev 1 2 … 167 168 169 … 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)