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
2020-12-09 13:35:24	C	11 21 29.94	-08 24 01.8	–	V	T08
2020-12-09 13:54:33	C	11 21 30.54	-08 24 13.9	–	V	T08
2020-12-09 14:06:32	C	11 21 30.94	-08 24 22.0	–	V	T08
2020-12-09 14:13:12	C	11 21 31.15	-08 24 26.2	–	V	T08
2020-12-10 15:15:15	C	11 22 30.53	-08 40 13.5	–	V	T05
2020-12-10 15:24:32	C	11 22 30.81	-08 40 19.3	–	V	T05
2020-12-10 15:50:27	C	11 22 31.60	-08 40 35.5	–	V	T05
2020-12-10 15:57:02	C	11 22 31.80	-08 40 39.4	–	V	T05
2020-12-11 14:56:18	C	11 23 27.28	-08 55 11.8	–	V	T05
2020-12-11 15:00:55	C	11 23 27.37	-08 55 12.8	–	V	T05
2020-12-11 15:13:26	C	11 23 27.79	-08 55 21.4	–	V	T05
2020-12-11 15:43:02	C	11 23 28.66	-08 55 40.4	–	V	T05
2020-12-12 14:25:30	C	11 24 23.442	-09 10 00.55	–	U	F51
2020-12-12 14:42:47	C	11 24 23.987	-09 10 11.66	–	U	F51
2020-12-14 05:05:20	C	11 25 54.03	-09 34 39.8	–	V	204
2020-12-14 05:14:07	C	11 25 54.32	-09 34 45.4	–	V	204
2020-12-14 05:22:53	C	11 25 54.61	-09 34 51.1	–	V	204
2020-12-15 10:23:45	C	11 27 03.85	-09 53 06.9	–	V	703
2020-12-15 10:31:26	C	11 27 04.15	-09 53 12.0	–	V	703
2020-12-15 13:53:31	C	11 27 11.942	-09 55 14.67	–	U	F51
2020-12-15 14:29:07	C	11 27 13.046	-09 55 37.65	–	U	F51
2020-12-15 14:46:46	C	11 27 13.583	-09 55 49.02	–	U	F51
2020-12-16 09:59:02	C	11 27 58.67	-10 08 02.6	–	V	703
2020-12-16 10:07:00	C	11 27 58.94	-10 08 07.7	–	V	703
2020-12-16 10:14:58	C	11 27 59.23	-10 08 13.1	–	V	703
2020-12-16 10:22:56	C	11 27 59.46	-10 08 18.0	–	V	703
2020-12-17 10:37:43	C	11 28 55.07	-10 23 38.8	–	V	I41
2020-12-17 12:29:26	C	11 28 58.51	-10 24 50.7	–	V	I41
2020-12-18 23:26:24	S	11 30 15.53	-10 46 20.2	–	L	C51
2020-12-19 02:34:32	S	11 30 22.51	-10 48 20.0	–	L	C51
2020-12-19 05:42:51	S	11 30 29.50	-10 50 19.6	–	L	C51
2020-12-19 05:43:02	S	11 30 29.57	-10 50 19.2	–	L	C51
2020-12-19 10:15:32	C	11 30 42.02	-10 53 43.0	–	V	703
2020-12-19 10:23:36	C	11 30 42.28	-10 53 48.2	–	V	703
2020-12-19 10:39:43	C	11 30 42.76	-10 53 59.2	–	V	703
2020-12-19 15:07:48	S	11 30 50.27	-10 56 14.9	–	L	C51
2020-12-19 15:07:59	S	11 30 50.335	-10 56 13.34	–	L	C51
2020-12-19 16:42:04	S	11 30 53.76	-10 57 14.5	–	L	C51
2020-12-19 18:16:07	S	11 30 57.22	-10 58 13.2	–	L	C51
2020-12-19 19:50:22	S	11 31 00.74	-10 59 12.5	–	L	C51
2020-12-19 21:24:27	S	11 31 04.17	-11 00 12.7	–	L	C51
2020-12-19 22:48:33	C	11 31 09.08	-11 01 38.6	–	V	N56
2020-12-19 22:58:41	S	11 31 07.60	-11 01 11.9	–	L	C51
2020-12-19 23:24:04	C	11 31 10.11	-11 02 01.7	–	V	N56
2020-12-19 23:59:40	C	11 31 11.08	-11 02 23.6	–	V	N56
2020-12-20 08:23:38	S	11 31 28.111	-11 07 07.07	–	L	C51
2020-12-21 10:03:52	C	11 32 26.16	-11 23 47.8	–	V	I41
2020-12-21 11:08:29	C	11 32 28.05	-11 24 29.6	–	V	I41
2020-12-21 14:20:13	C	11 32 34.679	-11 26 24.41	–	U	F51
2020-12-21 14:39:19	C	11 32 35.188	-11 26 36.60	–	U	F51

« Prev 1 2 … 91 92 93 … 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)