Eventually, from 1842 to 1848, German mathematician Eduard Heis and Prussian astronomer Friedrich Wilhelm Argelander began observing it once every few years.
最終，從1842年至1848年，德國數學家愛德華·海斯和普魯士天文學家弗里德里希·阿格蘭德每隔數年觀察它一次。