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Un asteroide da primato "saluterà" presto la Terra. Si chiama 2004 BL86, ha un diametro di 500 metri e il 26 gennaio alle 17:49 si troverà a soli 1,2 milioni di chilometri dal nostro pianeta (tre volte la distanza Terra-Luna). Sarà dunque visibile anche solo con piccoli binocoli o telescopi.
È il più grande che si avvicinerà a noi fino al 2027, quando passerà l’asteroide 1999 AN10. L'avvicinamento "sarà l'occasione per osservare un oggetto dalla Terra senza la necessità di raggiungerlo con una missione spaziale", rileva Andrea Milani, docente di Meccanica celeste all'Università di Pisa.
Di quest'oggetto si sa pochissimo, aggiunge, "le osservazioni potranno determinare forma, dimensione e fornire indicazioni sulla composizione".
ats/ZZ
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