Asteroid General Data

2009 HD₂₁ (744281)

General information

Preliminary designation	2009 HD₂₁
Number	744281
Group	Apollo
Absolute magnitude	18.24
Approximate diameter (m)	600
Approximate mass (kg)	3.91·10¹¹
Number of observations	215
Arc length (days)	5406

Approaches

No approaches found

Orbit initial data

Date of initial data	09/17/2026
M – mean anomaly (degrees)	253.395379
a – orbit major semiaxis (astronomical units)	2.76503700
e – orbit eccentricity	0.69021200
ω – orbit ascending node-perihelion angle (degrees)	134.512555
Ω – longitude of orbit ascending node (degrees)	178.906169
i – orbit inclination to the ecliptic plane (degrees)	18.744575

Orbital evolution

Date	M	a	e	ω	Ω	i	q	P
01/13/1829	296.337403	2.77595862	0.69557331	118.177975	195.374646	15.440817	0.84507590	4.625089
01/21/1858	39.991432	2.77154408	0.69658165	121.600379	191.916785	15.980052	0.84093733	4.614061
01/29/1887	152.772711	2.76417996	0.69730750	123.051489	190.454823	16.232169	0.83669653	4.595683
02/07/1916	253.858635	2.77837269	0.69114645	125.795843	187.690322	16.642481	0.85811027	4.631124
02/14/1945	2.228530	2.75818626	0.69558463	128.947792	184.546638	17.389204	0.83963428	4.580744
02/22/1974	115.350374	2.76790097	0.69250364	129.729687	183.761659	17.511555	0.85111947	4.604966
03/02/2003	212.745143	2.77343671	0.68949835	133.386412	179.912911	18.344197	0.86115666	4.618788
03/09/2032	323.066901	2.75928321	0.69149159	134.653838	178.837334	18.800322	0.85126206	4.583477
03/17/2061	68.353583	2.77544133	0.68676281	135.466513	178.060939	18.917863	0.86937144	4.623796
03/25/2090	160.457397	2.76776437	0.68266247	139.180663	174.344558	20.160912	0.87831549	4.604625
04/03/2119	271.455018	2.76068315	0.68366536	139.742976	173.816678	20.370244	0.87329971	4.586965
04/10/2148	18.253266	2.77969727	0.67279538	141.729143	171.820436	20.974472	0.90952978	4.634436
04/18/2177	116.977779	2.76359751	0.67568029	143.426462	170.261532	21.714314	0.89628914	4.594231

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