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
2021-02-27 05:04:05	S	10 02 31.723	-12 39 47.23	–	V	C57
2021-02-27 05:04:05	s	1 +37268.059	0 +362135.57	2090.0	–	C57
2021-02-27 05:14:05	S	10 02 29.760	-12 39 32.11	–	V	C57
2021-02-27 05:14:05	s	1 +36904.994	0 +362325.46	20.0	–	C57
2021-02-27 05:24:05	S	10 02 27.826	-12 39 17.86	–	V	C57
2021-02-27 05:24:05	s	1 +36541.821	0 +362514.27	7660.0	–	C57
2021-02-27 05:34:05	S	10 02 25.846	-12 39 03.89	–	V	C57
2021-02-27 05:34:05	s	1 +36178.540	0 +362701.98	5020.0	–	C57
2021-02-27 05:41:08	C	09 57 49.60	-12 35 15.1	–	V	851
2021-02-27 05:43:17	C	09 57 49.13	-12 35 11.9	–	V	851
2021-02-27 05:44:05	S	10 02 23.875	-12 38 49.88	–	V	C57
2021-02-27 05:44:05	s	1 +35815.153	0 +362888.61	2090.0	–	C57
2021-02-27 05:54:05	S	10 02 21.907	-12 38 35.52	–	V	C57
2021-02-27 05:54:05	s	1 +35451.660	0 +363074.16	8890.0	–	C57
2021-02-27 06:04:05	S	10 02 19.915	-12 38 20.83	–	V	C57
2021-02-27 06:04:05	s	1 +35088.064	0 +363258.61	5420.0	–	C57
2021-02-27 06:14:05	S	10 02 17.957	-12 38 05.17	–	V	C57
2021-02-27 06:14:05	s	1 +34724.365	0 +363441.99	1670.0	–	C57
2021-02-27 06:24:05	S	10 02 16.020	-12 37 51.10	–	V	C57
2021-02-27 06:24:05	s	1 +34360.565	0 +363624.28	7660.0	–	C57
2021-02-27 06:34:05	S	10 02 14.045	-12 37 37.02	–	V	C57
2021-02-27 06:34:05	s	1 +33996.664	0 +363805.49	3370.0	–	C57
2021-02-27 06:44:05	S	10 02 12.031	-12 37 22.66	–	V	C57
2021-02-27 06:44:05	s	1 +33632.664	0 +363985.62	8830.0	–	C57
2021-02-27 06:54:05	S	10 02 10.063	-12 37 08.87	–	V	C57
2021-02-27 06:54:05	s	1 +33268.567	0 +364164.67	4010.0	–	C57
2021-02-27 07:04:05	S	10 02 08.102	-12 36 54.29	–	V	C57
2021-02-27 07:04:05	s	1 +32904.372	0 +364342.64	8940.0	–	C57
2021-02-27 07:14:05	S	10 02 06.144	-12 36 38.74	–	V	C57
2021-02-27 07:14:05	s	1 +32540.082	0 +364519.52	3610.0	–	C57
2021-02-27 07:24:05	S	10 02 04.145	-12 36 24.44	–	V	C57
2021-02-27 07:24:05	s	1 +32175.698	0 +364695.33	8020.0	–	C57
2021-02-27 07:44:05	S	10 02 00.199	-12 35 56.26	–	V	C57
2021-02-27 07:44:05	s	1 +31446.652	0 +365043.72	6090.0	–	C57
2021-02-27 07:54:05	S	10 01 58.222	-12 35 41.82	–	V	C57
2021-02-27 07:54:05	s	1 +31081.992	0 +365216.30	9740.0	–	C57
2021-02-27 08:04:05	S	10 01 56.230	-12 35 27.06	–	V	C57
2021-02-27 08:04:05	s	1 +30717.242	0 +365387.80	3150.0	–	C57
2021-02-27 08:14:05	S	10 01 54.295	-12 35 11.62	–	V	C57
2021-02-27 08:14:05	s	1 +30352.404	0 +365558.23	6320.0	–	C57
2021-02-27 08:24:05	S	10 01 52.294	-12 34 57.54	–	V	C57
2021-02-27 08:24:05	s	1 +29987.479	0 +365727.58	9240.0	–	C57
2021-02-27 08:34:05	S	10 01 50.328	-12 34 42.96	–	V	C57
2021-02-27 08:34:05	s	1 +29622.468	0 +365895.86	1930.0	–	C57
2021-02-27 08:44:05	S	10 01 48.324	-12 34 29.21	–	V	C57
2021-02-27 08:44:05	s	1 +29257.372	0 +366063.06	4370.0	–	C57
2021-02-27 08:54:05	S	10 01 46.358	-12 34 14.88	–	V	C57
2021-02-27 08:54:05	s	1 +28892.192	0 +366229.20	6580.0	–	C57
2021-02-27 09:04:05	S	10 01 44.357	-12 34 00.01	–	V	C57
2021-02-27 09:04:05	s	1 +28526.929	0 +366394.26	8560.0	–	C57

« Prev 1 2 … 135 136 137 … 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)