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
2021-02-20 05:24:05	s	1 -200081.38	6 +143768.18	9570.0	–	C57
2021-02-20 05:34:05	S	10 30 23.095	-16 43 54.23	–	V	C57
2021-02-20 05:34:05	s	1 -200025.21	4 +143032.79	4900.0	–	C57
2021-02-20 05:44:05	S	10 30 20.782	-16 43 42.60	–	V	C57
2021-02-20 05:44:05	s	1 -199967.18	0 +142296.07	6730.0	–	C57
2021-02-20 05:54:05	S	10 30 18.434	-16 43 30.50	–	V	C57
2021-02-20 05:54:05	s	1 -199907.27	4 +141558.00	5060.0	–	C57
2021-02-20 06:04:05	S	10 30 16.034	-16 43 18.59	–	V	C57
2021-02-20 06:04:05	s	1 -199845.48	4 +140818.60	9860.0	–	C57
2021-02-20 06:14:05	S	10 30 13.742	-16 43 05.95	–	V	C57
2021-02-20 06:14:05	s	1 -199781.80	2 +140077.86	1120.0	–	C57
2021-02-20 06:24:05	S	10 30 11.318	-16 42 53.89	–	V	C57
2021-02-20 06:24:05	s	1 -199716.21	5 +139335.78	8810.0	–	C57
2021-02-20 06:34:05	S	10 30 08.983	-16 42 41.90	–	V	C57
2021-02-20 06:34:05	s	1 -199648.71	6 +138592.37	2920.0	–	C57
2021-02-20 06:44:05	S	10 30 06.648	-16 42 29.27	–	V	C57
2021-02-20 06:44:05	s	1 -199579.29	1 +137847.61	3410.0	–	C57
2021-02-20 06:54:05	S	10 30 04.327	-16 42 18.00	–	V	C57
2021-02-20 06:54:05	s	1 -199507.93	2 +137101.52	290.0	–	C57
2021-02-20 07:04:05	S	10 30 01.968	-16 42 05.00	–	V	C57
2021-02-20 07:04:05	s	1 -199434.62	7 +136354.08	3510.0	–	C57
2021-02-20 07:14:05	S	10 29 59.642	-16 41 52.48	–	V	C57
2021-02-20 07:14:05	s	1 -199359.36	6 +135605.30	3070.0	–	C57
2021-02-20 07:24:05	S	10 29 57.223	-16 41 40.96	–	V	C57
2021-02-20 07:24:05	s	1 -199282.13	7 +134855.19	8940.0	–	C57
2021-02-20 07:34:05	S	10 29 54.835	-16 41 28.72	–	V	C57
2021-02-20 07:34:05	s	1 -199202.93	0 +134103.72	1100.0	–	C57
2021-02-20 07:44:05	S	10 29 52.579	-16 41 16.76	–	V	C57
2021-02-20 07:44:05	s	1 -199121.73	4 +133350.92	9530.0	–	C57
2021-02-20 07:54:05	S	10 29 50.239	-16 41 04.13	–	V	C57
2021-02-20 07:54:05	s	1 -199038.53	8 +132596.77	4210.0	–	C57
2021-02-20 08:04:05	S	10 29 47.813	-16 40 51.49	–	V	C57
2021-02-20 08:04:05	s	1 -198953.33	0 +131841.28	5110.0	–	C57
2021-02-20 08:14:05	S	10 29 45.487	-16 40 40.08	–	V	C57
2021-02-20 08:14:05	s	1 -198866.09	9 +131084.45	2220.0	–	C57
2021-02-20 08:24:05	S	10 29 43.121	-16 40 27.26	–	V	C57
2021-02-20 08:24:05	s	1 -198776.83	4 +130326.27	5510.0	–	C57
2021-02-20 08:34:05	S	10 29 40.771	-16 40 14.02	–	V	C57
2021-02-20 08:34:05	s	1 -198685.52	3 +129566.75	4970.0	–	C57
2021-02-20 08:44:05	S	10 29 38.424	-16 40 02.21	–	V	C57
2021-02-20 08:44:05	s	1 -198592.15	5 +128805.88	560.0	–	C57
2021-02-20 08:54:05	S	10 29 36.041	-16 39 49.14	–	V	C57
2021-02-20 08:54:05	s	1 -198496.71	8 +128043.67	2270.0	–	C57
2021-02-20 09:04:05	S	10 29 33.684	-16 39 37.73	–	V	C57
2021-02-20 09:04:05	s	1 -198399.20	0 +127280.11	70.0	–	C57
2021-02-20 09:24:05	S	10 29 29.026	-16 39 12.85	–	V	C57
2021-02-20 09:24:05	s	1 -198197.87	5 +125748.96	3860.0	–	C57
2021-02-20 09:34:05	S	10 29 26.606	-16 38 59.96	–	V	C57
2021-02-20 09:34:05	s	1 -198094.04	3 +124981.36	9810.0	–	C57
2021-02-20 09:44:05	S	10 29 24.336	-16 38 48.01	–	V	C57

« Prev 1 2 … 116 117 118 … 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)