family from Trondhjem

I know my grandfather, Parelius Johanson left Norway on May 18 1881 on the steamship "Hero." I got that information from the Digital Archives. He used the name Paulius Johanson. He had a brother Kristian Gregor, born 1859, a sister Mathilda, born 1863, who was married to Kristian Lorentzen in 1882 in Guding, Vigten, Næro, and they both emigrated. I did not find them in the Digital Archives. I would like to know the date of departure, the ship, and arrival date. Thank you. Be