Asteroid General Data

2021 SD

General information

Preliminary designation	2021 SD
Group	Apollo
Absolute magnitude	26.91
Approximate diameter (m)	11
Approximate mass (kg)	2.45·10⁶
Number of observations	28
Arc length (days)	1

Approaches

No approaches found

Orbit initial data

Date of initial data	09/17/2026
M – mean anomaly (degrees)	6.057030
a – orbit major semiaxis (astronomical units)	1.32424400
e – orbit eccentricity	0.32046500
ω – orbit ascending node-perihelion angle (degrees)	237.607390
Ω – longitude of orbit ascending node (degrees)	174.226370
i – orbit inclination to the ecliptic plane (degrees)	13.149530

Orbital evolution

Date	M	a	e	ω	Ω	i	q	P
01/13/1829	118.029389	1.33010792	0.32181569	235.190916	175.556803	13.194096	0.90205832	1.534020
01/21/1858	87.575432	1.33058002	0.32214335	235.430978	175.379317	13.191735	0.90194251	1.534836
01/29/1887	60.169636	1.32850959	0.32143879	235.833341	175.186579	13.195954	0.90147507	1.531255
02/07/1916	41.563188	1.32890187	0.32150075	236.032678	174.989506	13.192733	0.90165892	1.531934
02/14/1945	15.640936	1.33124584	0.32251660	236.118830	174.813077	13.177583	0.90189696	1.535989
02/22/1974	336.289783	1.33143370	0.32269678	236.472688	174.614858	13.172773	0.90178433	1.536314
03/02/2003	296.995721	1.33006245	0.32222613	236.875078	174.394022	13.170694	0.90148157	1.533941
03/09/2032	282.459187	1.32511788	0.32087074	237.650683	174.188064	13.157617	0.89992632	1.525395
03/17/2061	292.145453	1.32499633	0.32095009	237.895909	174.010543	13.156453	0.89973864	1.525185
03/25/2090	299.355261	1.32634630	0.32170741	238.059340	173.816011	13.142880	0.89965087	1.527517
04/03/2119	299.730677	1.32631958	0.32169421	238.246632	173.643533	13.141783	0.89965025	1.527471
04/10/2148	305.674435	1.32387436	0.32106575	238.723130	173.451589	13.142812	0.89882365	1.523249
04/18/2177	324.806478	1.32338329	0.32087577	239.001060	173.257531	13.142498	0.89874165	1.522401

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