There is a distinct magic to looking at archival survey data. For most people, a wide-field professional survey like the Pan-Andromeda Archaeological Survey (PAndAS) is a collection of pretty pictures or an overwhelming dataset of numbers. But for an observer, it’s a treasure map.
Just recently, a fascinating new paper was published in Astronomy & Astrophysics detailing the discovery of a brand-new ultra-faint dwarf (UFD) galaxy orbiting our massive neighbor, M31. The name? Andromeda XXXVI.
What makes this discovery incredibly special—and why I wanted to share it with you all today—is how it was found. It wasn't flagged by an advanced machine-learning algorithm or an automated data-mining pipeline. It was found through old-school, systematic visual inspection of public images by an amateur astronomer, Giuseppe Donatiello.