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 06:24:05	s	1 -187290.52	1 +229998.48	680.0	–	C57
2021-03-04 06:34:05	S	09 35 36.197	-09 15 27.04	–	V	C57
2021-03-04 06:34:05	s	1 -187426.30	6 +229427.49	1440.0	–	C57
2021-03-04 06:44:05	S	09 35 33.785	-09 15 08.10	–	V	C57
2021-03-04 06:44:05	s	1 -187561.07	7 +228855.26	350.0	–	C57
2021-03-04 06:54:05	S	09 35 31.406	-09 14 49.24	–	V	C57
2021-03-04 06:54:05	s	1 -187694.82	9 +228281.79	7430.0	–	C57
2021-03-04 07:04:05	S	09 35 29.023	-09 14 29.08	–	V	C57
2021-03-04 07:04:05	s	1 -187827.55	9 +227707.08	2650.0	–	C57
2021-03-04 07:10:57	C	09 34 26.22	-08 58 48.2	–	V	703
2021-03-04 07:14:05	S	09 35 26.606	-09 14 08.70	–	V	C57
2021-03-04 07:14:05	s	1 -187959.26	2 +227131.13	6010.0	–	C57
2021-03-04 07:24:05	S	09 35 24.266	-09 13 49.58	–	V	C57
2021-03-04 07:24:05	s	1 -188089.93	3 +226553.93	7490.0	–	C57
2021-03-04 07:25:58	C	09 34 23.04	-08 58 21.0	–	V	703
2021-03-04 07:33:29	C	09 34 21.49	-08 58 05.5	–	V	703
2021-03-04 07:34:05	S	09 35 21.905	-09 13 31.19	–	V	C57
2021-03-04 07:34:05	s	1 -188219.56	9 +225975.48	7100.0	–	C57
2021-03-04 07:44:05	S	09 35 19.584	-09 13 11.32	–	V	C57
2021-03-04 07:44:05	s	1 -188348.16	4 +225395.79	4830.0	–	C57
2021-03-04 07:54:05	S	09 35 17.189	-09 12 50.94	–	V	C57
2021-03-04 07:54:05	s	1 -188475.71	4 +224814.86	660.0	–	C57
2021-03-04 08:04:05	S	09 35 14.777	-09 12 31.90	–	V	C57
2021-03-04 08:04:05	s	1 -188602.21	5 +224232.67	4580.0	–	C57
2021-03-04 08:14:05	S	09 35 12.451	-09 12 13.21	–	V	C57
2021-03-04 08:14:05	s	1 -188727.66	2 +223649.24	6590.0	–	C57
2021-03-04 08:24:05	S	09 35 10.037	-09 11 53.38	–	V	C57
2021-03-04 08:24:05	s	1 -188852.05	0 +223064.55	6680.0	–	C57
2021-03-04 08:34:05	S	09 35 07.632	-09 11 33.00	–	V	C57
2021-03-04 08:34:05	s	1 -188975.37	6 +222478.61	4840.0	–	C57
2021-03-04 08:44:05	S	09 35 05.297	-09 11 14.17	–	V	C57
2021-03-04 08:44:05	s	1 -189097.63	4 +221891.41	1060.0	–	C57
2021-03-04 08:54:05	S	09 35 02.873	-09 10 54.52	–	V	C57
2021-03-04 08:54:05	s	1 -189218.82	0 +221302.96	5340.0	–	C57
2021-03-04 09:04:05	S	09 35 00.473	-09 10 35.33	–	V	C57
2021-03-04 09:04:05	s	1 -189338.92	9 +220713.26	7650.0	–	C57
2021-03-04 09:14:05	S	09 34 58.154	-09 10 14.81	–	V	C57
2021-03-04 09:14:05	s	1 -189457.95	6 +220122.29	8000.0	–	C57
2021-03-04 09:24:05	S	09 34 55.745	-09 09 54.25	–	V	C57
2021-03-04 09:24:05	s	1 -189575.89	8 +219530.07	6380.0	–	C57
2021-03-04 09:34:05	S	09 34 53.410	-09 09 36.61	–	V	C57
2021-03-04 09:34:05	s	1 -189692.74	8 +218936.58	2770.0	–	C57
2021-03-04 09:44:05	S	09 34 51.024	-09 09 17.68	–	V	C57
2021-03-04 09:44:05	s	1 -189808.50	2 +218341.83	7170.0	–	C57
2021-03-04 09:54:05	S	09 34 48.720	-09 08 57.55	–	V	C57
2021-03-04 09:54:05	s	1 -189923.15	5 +217745.82	9560.0	–	C57
2021-03-04 10:04:05	S	09 34 46.310	-09 08 37.21	–	V	C57
2021-03-04 10:04:05	s	1 -190036.70	3 +217148.55	9950.0	–	C57
2021-03-04 10:14:05	S	09 34 43.867	-09 08 17.92	–	V	C57
2021-03-04 10:14:05	s	1 -190149.14	1 +216550.01	8310.0	–	C57

« Prev 1 2 … 166 167 168 … 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)