Asteroid General Data

2021 ER

General information

Preliminary designation	2021 ER
Group	Aten
Absolute magnitude	26.99
Approximate diameter (m)	11
Approximate mass (kg)	2.20·10⁶
Number of observations	95
Arc length (days)	1830

Approaches

No approaches found

Orbit initial data

Date of initial data	09/17/2026
M – mean anomaly (degrees)	13.014245
a – orbit major semiaxis (astronomical units)	0.88249500
e – orbit eccentricity	0.15711200
ω – orbit ascending node-perihelion angle (degrees)	213.324214
Ω – longitude of orbit ascending node (degrees)	161.618513
i – orbit inclination to the ecliptic plane (degrees)	5.453355

Orbital evolution

Date	M	a	e	ω	Ω	i	q	P
01/13/1829	200.941013	0.89514875	0.15036015	213.498870	165.635423	5.693549	0.76055405	0.846922
01/21/1858	296.303779	0.89471162	0.15072331	213.815453	165.288900	5.695515	0.75985772	0.846302
01/29/1887	55.242273	0.89386506	0.15009867	214.174284	164.945061	5.700400	0.75969710	0.845101
02/07/1916	155.632070	0.89530407	0.14869920	214.827205	164.591175	5.710848	0.76217308	0.847142
02/14/1945	272.064048	0.89364276	0.14720888	215.422861	164.225715	5.720400	0.76209061	0.844786
02/22/1974	346.643624	0.89618949	0.14550726	216.944643	163.500716	5.738104	0.76578741	0.848399
03/02/2003	61.541221	0.89497811	0.14531603	217.293891	162.837780	5.719560	0.76492345	0.846680
03/09/2032	230.746314	0.88197715	0.15742286	213.504085	161.470865	5.454068	0.74313379	0.828298
03/17/2061	291.267534	0.87775056	0.15997638	212.998184	160.767672	5.371935	0.73733120	0.822351
03/25/2090	46.201520	0.87607751	0.15970990	213.705227	160.018976	5.352399	0.73615926	0.820001
04/03/2119	188.181831	0.87438728	0.15546234	214.890709	159.499723	5.378564	0.73845298	0.817629
04/10/2148	13.826312	0.87425304	0.15522356	215.034025	159.292692	5.380234	0.73854837	0.817441
04/18/2177	161.658684	0.87681666	0.15606488	215.512487	158.923158	5.382755	0.73997637	0.821039

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