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 03:14:05	S	09 47 34.742	-10 49 12.07	–	V	C57
2021-03-02 03:14:05	s	1 -112315.70	2 +351682.32	1120.0	–	C57
2021-03-02 03:24:05	S	09 47 32.429	-10 48 55.40	–	V	C57
2021-03-02 03:24:05	s	1 -112633.98	8 +351447.56	970.0	–	C57
2021-03-02 03:34:05	S	09 47 30.166	-10 48 38.52	–	V	C57
2021-03-02 03:34:05	s	1 -112951.95	1 +351211.80	290.0	–	C57
2021-03-02 03:44:05	S	09 47 27.953	-10 48 22.14	–	V	C57
2021-03-02 03:44:05	s	1 -113269.59	0 +350975.03	9080.0	–	C57
2021-03-02 03:54:05	S	09 47 25.682	-10 48 03.64	–	V	C57
2021-03-02 03:54:05	s	1 -113586.90	4 +350737.26	7340.0	–	C57
2021-03-02 04:04:05	S	09 47 23.352	-10 47 45.67	–	V	C57
2021-03-02 04:04:05	s	1 -113903.89	1 +350498.49	5070.0	–	C57
2021-03-02 04:14:05	S	09 47 21.096	-10 47 28.90	–	V	C57
2021-03-02 04:14:05	s	1 -114220.55	1 +350258.71	2250.0	–	C57
2021-03-02 04:24:05	S	09 47 18.828	-10 47 12.26	–	V	C57
2021-03-02 04:24:05	s	1 -114536.88	2 +350017.92	8900.0	–	C57
2021-03-02 04:34:05	S	09 47 16.577	-10 46 55.67	–	V	C57
2021-03-02 04:34:05	s	1 -114852.88	3 +349776.14	5000.0	–	C57
2021-03-02 04:44:05	S	09 47 14.285	-10 46 38.17	–	V	C57
2021-03-02 04:44:05	s	1 -115168.55	3 +349533.34	570.0	–	C57
2021-03-02 04:54:05	S	09 47 12.002	-10 46 19.78	–	V	C57
2021-03-02 04:54:05	s	1 -115483.88	9 +349289.54	5580.0	–	C57
2021-03-02 05:04:05	S	09 47 09.778	-10 46 02.71	–	V	C57
2021-03-02 05:04:05	s	1 -115798.89	2 +349044.74	50.0	–	C57
2021-03-02 05:14:05	S	09 47 07.426	-10 45 47.56	–	V	C57
2021-03-02 05:14:05	s	1 -116113.56	0 +348798.93	3960.0	–	C57
2021-03-02 05:24:05	S	09 47 04.975	-10 45 38.63	–	V	C57
2021-03-02 05:24:05	s	1 -116427.89	2 +348552.11	7320.0	–	C57
2021-03-02 05:34:05	S	09 47 02.868	-10 45 11.88	–	V	C57
2021-03-02 05:34:05	s	1 -116741.88	6 +348304.28	130.0	–	C57
2021-03-02 05:44:05	S	09 47 00.622	-10 44 53.59	–	V	C57
2021-03-02 05:44:05	s	1 -117055.54	1 +348055.45	2380.0	–	C57
2021-03-02 05:54:05	S	09 46 58.368	-10 44 35.92	–	V	C57
2021-03-02 05:54:05	s	1 -117368.85	6 +347805.61	4060.0	–	C57
2021-03-02 06:04:05	S	09 46 56.102	-10 44 19.61	–	V	C57
2021-03-02 06:04:05	s	1 -117681.82	9 +347554.76	5190.0	–	C57
2021-03-02 06:24:05	S	09 46 51.506	-10 43 45.80	–	V	C57
2021-03-02 06:24:05	s	1 -118306.74	7 +347050.04	5740.0	–	C57
2021-03-02 06:34:05	S	09 46 49.270	-10 43 28.45	–	V	C57
2021-03-02 06:34:05	s	1 -118618.68	9 +346796.17	5160.0	–	C57
2021-03-02 06:44:05	S	09 46 46.987	-10 43 09.84	–	V	C57
2021-03-02 06:44:05	s	1 -118930.28	4 +346541.29	4000.0	–	C57
2021-03-02 06:54:05	S	09 46 44.681	-10 42 52.78	–	V	C57
2021-03-02 06:54:05	s	1 -119241.53	1 +346285.40	2280.0	–	C57
2021-03-02 07:04:05	S	09 46 42.394	-10 42 35.89	–	V	C57
2021-03-02 07:04:05	s	1 -119552.43	0 +346028.49	9970.0	–	C57
2021-03-02 07:14:05	S	09 46 40.080	-10 42 19.04	–	V	C57
2021-03-02 07:14:05	s	1 -119862.97	8 +345770.58	7090.0	–	C57
2021-03-02 07:34:05	S	09 46 35.599	-10 41 43.26	–	V	C57
2021-03-02 07:34:05	s	1 -120483.01	7 +345251.72	9580.0	–	C57

« Prev 1 2 … 150 151 152 … 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)