Rahoton NASA na ranar 18 Yuni kan Lucy da Donaldjohanson ya bayyana asteroid mai tarihin sauye-sauye. Jirgin ya wuce a nisan kusan kilomita 1,000 ranar 20 Afrilu 2025. Ya tattara hotuna da ma'aunai a lokacin gwajin shirin ziyarar Trojan asteroids na gaba.
Donaldjohanson yana da ɓangarori biyu da ƙaramar wuya ta haɗa su. Masu bincike suna ganin siffar gyadar ta samo asali daga gutsattsarin da suka haɗu a hankali bayan wani karo a da. Don haka siffarsa shaida ce kan yadda aka haɗa shi, ba kamanni mai ban dariya kawai ba.
Juyawarsa ma ta fi abin da lura daga Duniya ta nuna rikitarwa. Nazarin ya ce yana juya ƙarshen zuwa ƙarshe cikin kusan kwanakin Duniya 10.5, tare da karkarwa kewaye da dogon axis cikin kusan kwanaki 26.5. Ba juyawa mai daidaito a axis guda yake yi ba.
Masu bincike suna ganin dumamar Rana ta taimaka wajen rage gudunsa tsawon miliyoyin shekaru. Infrared da sassa daban-daban ke fitarwa ba daidai ba yana haifar da ƙaramin ƙarfin murɗawa, mai suna YORP. Sauyin juyawa zai iya sa duwatsu marasa ɗauri su gangaro, suna rage kaifin ramuka.
Lucy ta kuma gano alamun yumbu mai arzikin baƙin ƙarfe. Waɗannan ma'adinai suna nuna aikin ruwa a zamanin da. Amma masana sun hango ɗan gajeren lokacin ruwa idan aka kwatanta da Bennu da Ryugu. Shaidar ba ta nufin ruwa yana gudana a Donaldjohanson yanzu ba.
Sakamakon Yuni ya mayar da wucewar gwaji zuwa muhimmin kwatancen asteroids. Siffa, juyawa da ma'adinai suna riƙe sassa daban-daban na tarihi. Haɗa su yana taimaka wajen gwada yadda waɗannan abubuwa suka samu, suka sauya kuma suka yi ƙaura tun kafin jirgin bincike ya isa gare su.