Umov effect in asteroid (3200) Phaethon Maxim Zheltobryukhov, Ekaterina Chornaya, Anton Kochergin, Gennady Kornienko, Alexey Matkin, Oleksandra Ivanova, Igor Luk’yanyk and Evgenij Zubko A&A, 620 (2018) A179 Published online: 14 December 2018 DOI: 10.1051/0004-6361/201833408