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
2021-03-01 01:24:05	s	1 -59791.986	0 +376079.19	3690.0	–	C57
2021-03-01 01:34:05	S	09 53 17.402	-11 31 55.16	–	V	C57
2021-03-01 01:34:05	s	1 -60146.983	0 +375997.68	660.0	–	C57
2021-03-01 01:44:05	S	09 53 15.247	-11 31 39.40	–	V	C57
2021-03-01 01:44:05	s	1 -60501.822	0 +375915.18	7410.0	–	C57
2021-03-01 01:54:05	S	09 53 13.058	-11 31 23.95	–	V	C57
2021-03-01 01:54:05	s	1 -60856.501	0 +375831.70	3920.0	–	C57
2021-03-01 02:04:05	S	09 53 10.867	-11 31 08.44	–	V	C57
2021-03-01 02:04:05	s	1 -61211.019	0 +375747.23	220.0	–	C57
2021-03-01 02:14:05	S	09 53 08.628	-11 30 51.77	–	V	C57
2021-03-01 02:14:05	s	1 -61565.375	0 +375661.79	6280.0	–	C57
2021-03-01 02:24:05	S	09 53 06.538	-11 30 35.28	–	V	C57
2021-03-01 02:24:05	s	1 -61919.569	0 +375575.35	2110.0	–	C57
2021-03-01 02:34:05	S	09 53 04.354	-11 30 18.79	–	V	C57
2021-03-01 02:34:05	s	1 -62273.599	0 +375487.94	7710.0	–	C57
2021-03-01 02:44:05	S	09 53 02.141	-11 30 02.77	–	V	C57
2021-03-01 02:44:05	s	1 -62627.464	0 +375399.54	3080.0	–	C57
2021-03-01 02:54:05	S	09 52 59.981	-11 29 47.26	–	V	C57
2021-03-01 02:54:05	s	1 -62981.164	0 +375310.15	8200.0	–	C57
2021-03-01 03:04:05	S	09 52 57.797	-11 29 31.78	–	V	C57
2021-03-01 03:04:05	s	1 -63334.697	0 +375219.78	3100.0	–	C57
2021-03-01 03:14:05	S	09 52 55.598	-11 29 15.18	–	V	C57
2021-03-01 03:14:05	s	1 -63688.063	0 +375128.43	7750.0	–	C57
2021-03-01 03:24:05	S	09 52 53.448	-11 28 58.26	–	V	C57
2021-03-01 03:24:05	s	1 -64041.260	0 +375036.10	2160.0	–	C57
2021-03-01 03:34:05	S	09 52 51.276	-11 28 41.88	–	V	C57
2021-03-01 03:34:05	s	1 -64394.288	0 +374942.78	6320.0	–	C57
2021-03-01 03:44:05	S	09 52 49.042	-11 28 25.90	–	V	C57
2021-03-01 03:44:05	s	1 -64747.146	0 +374848.48	250.0	–	C57
2021-03-01 03:54:05	S	09 52 46.822	-11 28 10.02	–	V	C57
2021-03-01 03:54:05	s	1 -65099.832	0 +374753.20	3920.0	–	C57
2021-03-01 04:04:05	S	09 52 44.686	-11 27 54.61	–	V	C57
2021-03-01 04:04:05	s	1 -65452.346	0 +374656.93	7350.0	–	C57
2021-03-01 04:14:05	S	09 52 42.514	-11 27 38.05	–	V	C57
2021-03-01 04:14:05	s	1 -65804.686	0 +374559.68	520.0	–	C57
2021-03-01 04:24:05	S	09 52 40.289	-11 27 20.66	–	V	C57
2021-03-01 04:24:05	s	1 -66156.853	0 +374461.44	3450.0	–	C57
2021-03-01 04:34:05	S	09 52 38.117	-11 27 04.79	–	V	C57
2021-03-01 04:34:05	s	1 -66508.844	0 +374362.23	6120.0	–	C57
2021-03-01 04:44:05	S	09 52 35.918	-11 26 48.62	–	V	C57
2021-03-01 04:44:05	s	1 -66860.659	0 +374262.03	8530.0	–	C57
2021-03-01 04:54:05	S	09 52 33.703	-11 26 32.21	–	V	C57
2021-03-01 04:54:05	s	1 -67212.297	0 +374160.84	690.0	–	C57
2021-03-01 05:04:05	S	09 52 31.555	-11 26 16.76	–	V	C57
2021-03-01 05:04:05	s	1 -67563.757	0 +374058.68	2590.0	–	C57
2021-03-01 05:14:05	S	09 52 29.366	-11 26 00.31	–	V	C57
2021-03-01 05:14:05	s	1 -67915.037	0 +373955.53	4220.0	–	C57
2021-03-01 05:24:05	S	09 52 27.144	-11 25 43.32	–	V	C57
2021-03-01 05:24:05	s	1 -68266.138	0 +373851.39	5600.0	–	C57
2021-03-01 05:34:05	S	09 52 24.972	-11 25 27.12	–	V	C57

« Prev 1 2 … 145 146 147 … 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)