Original: It is an S-type asteroid approximately 34.4 × 11.2 × 11.2 km in size , the second-largest near-Earth asteroid ( NEA ) after 1036 Ganymed , belonging to the Amors .
Simplified: On January 31 , 2012 , Eros is expected to pass Earth at 0.1787 astronomical units ( 16.6 million miles ) with a visual magnitude of +8.1 .