ɐkˈoːɹdɪŋ tə ðə sˈɜːveɪ kˈæɹid ˈaʊt baɪ nˈæsɐ wˈaɪdfˈiːld ˌɪnfɹɚɹˈɛd sˈɜːveɪ ɛksplˈoːɹɚ wɪð ɪts sˈʌbsᵻkwənt nˈiːoʊwˌaɪz mˈɪʃən, bˈɛsəl mˈɛʒɚz bᵻtwˌiːn sˈɪkstiːn.sˈɪksti θɹˈiː ænd ˈeɪtiːn.ˈeɪthˈʌndɹɪd sˈɛvəntˌiːn kɪlˈɑːmɪɾɚz ɪn daɪˈæmɪɾɚ, ænd ɪts sˈɜːfɪs hɐz ɐn ælbˈiːdoʊ bᵻtwˌiːn zˈiəɹoʊ.wˈʌn θˈaʊzənd fˈaɪvhˈʌndɹɪd fˈoːɹtiːn ænd zˈiəɹoʊ.wˈʌnhˈʌndɹɪd nˈaɪnti θɹˈiː.
According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Bessel measures between 16.63 and 18.817 kilometers in diameter, and its surface has an albedo between 0.1514 and 0.193.