The asteroid has been observed to take 21 months to completely orbit the sun and it is about one mile wide.
(The asteroid; has been observed; to take 21 months to completely orbit the sun) (The asteroid; to take; 21 months) (it; is; about one mile wide)
The asteroid The asteroid it
has been observed to take is
to take 21 months to completely orbit the sun
21 months
about one mile wide