× Sunspot 3590 Date 2024.02.26 Filters 540nm continuum filter Taken by Martin Additional information The Sunspot group AR3590 is the largest sunspot region of Solar Cycle 25 so far. Equipment: 130mm f/7 apo, Baader Herschel wedge, Baader FFC Barlow at 3.5X, ZWO ASI 120MM-mini camera. Back to Solar System Back to gallery