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 13:24:05	S	10 00 52.469	-12 27 39.02	–	V	C57
2021-02-27 13:24:05	s	1 +19004.866	0 +370312.01	5210.0	–	C57
2021-02-27 13:34:05	S	10 00 50.424	-12 27 24.84	–	V	C57
2021-02-27 13:34:05	s	1 +18637.804	0 +370448.40	1710.0	–	C57
2021-02-27 13:44:05	S	10 00 48.401	-12 27 10.30	–	V	C57
2021-02-27 13:44:05	s	1 +18270.691	0 +370583.73	8040.0	–	C57
2021-02-27 13:54:05	S	10 00 46.409	-12 26 55.93	–	V	C57
2021-02-27 13:54:05	s	1 +17903.527	0 +370718.01	4200.0	–	C57
2021-02-27 14:14:05	S	10 00 42.422	-12 26 25.01	–	V	C57
2021-02-27 14:14:05	s	1 +17169.055	0 +370983.41	6010.0	–	C57
2021-02-27 14:24:05	S	10 00 40.366	-12 26 10.46	–	V	C57
2021-02-27 14:24:05	s	1 +16801.748	0 +371114.54	1670.0	–	C57
2021-02-27 14:34:05	S	10 00 38.352	-12 25 56.64	–	V	C57
2021-02-27 14:34:05	s	1 +16434.396	0 +371244.62	7170.0	–	C57
2021-02-27 14:44:05	S	10 00 36.350	-12 25 41.88	–	V	C57
2021-02-27 14:44:05	s	1 +16066.999	0 +371373.64	2500.0	–	C57
2021-02-27 14:54:05	S	10 00 34.330	-12 25 27.62	–	V	C57
2021-02-27 14:54:05	s	1 +15699.558	0 +371501.62	7680.0	–	C57
2021-02-27 15:04:05	S	10 00 32.318	-12 25 11.71	–	V	C57
2021-02-27 15:04:05	s	1 +15332.075	0 +371628.55	2700.0	–	C57
2021-02-27 15:14:05	S	10 00 30.314	-12 24 56.95	–	V	C57
2021-02-27 15:14:05	s	1 +14964.551	0 +371754.43	7570.0	–	C57
2021-02-27 15:24:05	S	10 00 28.303	-12 24 41.54	–	V	C57
2021-02-27 15:24:05	s	1 +14596.986	0 +371879.26	2280.0	–	C57
2021-02-27 15:34:05	S	10 00 26.294	-12 24 26.89	–	V	C57
2021-02-27 15:34:05	s	1 +14229.383	0 +372003.05	6850.0	–	C57
2021-02-27 15:44:05	S	10 00 24.245	-12 24 13.25	–	V	C57
2021-02-27 15:44:05	s	1 +13861.741	0 +372125.79	1270.0	–	C57
2021-02-27 15:54:05	S	10 00 22.202	-12 23 58.67	–	V	C57
2021-02-27 15:54:05	s	1 +13494.062	0 +372247.49	5540.0	–	C57
2021-02-27 16:04:05	S	10 00 20.179	-12 23 42.32	–	V	C57
2021-02-27 16:04:05	s	1 +13126.347	0 +372368.14	9670.0	–	C57
2021-02-27 16:14:05	S	10 00 18.161	-12 23 27.74	–	V	C57
2021-02-27 16:14:05	s	1 +12758.597	0 +372487.75	3650.0	–	C57
2021-02-27 16:24:05	S	10 00 16.150	-12 23 13.34	–	V	C57
2021-02-27 16:24:05	s	1 +12390.813	0 +372606.31	7500.0	–	C57
2021-02-27 16:34:05	S	10 00 14.122	-12 22 58.87	–	V	C57
2021-02-27 16:34:05	s	1 +12022.997	0 +372723.83	1210.0	–	C57
2021-02-27 16:44:05	S	10 00 12.094	-12 22 44.40	–	V	C57
2021-02-27 16:44:05	s	1 +11655.148	0 +372840.31	4780.0	–	C57
2021-02-27 16:54:05	S	10 00 10.070	-12 22 29.57	–	V	C57
2021-02-27 16:54:05	s	1 +11287.269	0 +372955.74	8220.0	–	C57
2021-02-27 17:04:05	S	10 00 08.045	-12 22 13.76	–	V	C57
2021-02-27 17:04:05	s	1 +10919.361	0 +373070.14	1530.0	–	C57
2021-02-27 17:14:05	S	10 00 06.029	-12 21 58.61	–	V	C57
2021-02-27 17:14:05	s	1 +10551.423	0 +373183.49	4700.0	–	C57
2021-02-27 17:24:05	S	10 00 03.989	-12 21 44.28	–	V	C57
2021-02-27 17:24:05	s	1 +10183.458	0 +373295.80	7750.0	–	C57
2021-02-27 17:34:05	S	10 00 01.944	-12 21 29.70	–	V	C57
2021-02-27 17:44:05	S	09 59 59.933	-12 21 15.34	–	V	C57

« Prev 1 2 … 137 138 139 … 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)