The effect of lunar mass concentrations ("mascons") on the orbit was found to be greater than initially predicted; over the course of the ten lunar orbits lasting twenty hours, the orbital distance was perturbated to .
ðɪ ɪfˈɛkt ʌv lˈuːnɚ mˈæs kˌɑːnsəntɹˈeɪʃənz"mˈæskənz"ɔnðɪ ˈɔːɹbɪt wʌz fˈaʊnd təbi ɡɹˈeɪɾɚ ðɐn ɪnˈɪʃəli pɹɪdˈɪktᵻd; ˌoʊvɚ ðə kˈoːɹs ʌvðə tˈɛn lˈuːnɚɹ ˈɔːɹbɪts lˈæstɪŋ twˈɛnti ˈaʊɚz, ðɪ ˈɔːɹbɪɾəl dˈɪstəns wʌz pɚtˈɜːbeɪɾᵻd tuː .