An article published in the journal “The Astrophysical Journal” describes the most accurate measurement of the characteristics of the ultra-cold dwarf star TRAPPIST-1. A team led by astronomer Valérie Van Grootel of the University of Liège in Belgium used new observations and analysis techniques to refine the measurements of TRAPPIST-1. It’s become the subject of a lot of research after the confirmation in February 2017 that 7 rocky planets orbit this tiny star and knowing its characteristics with precision helps to study the whole system.