Septembrio? Septentrio? Error in dates?

Norway Heritage's list of ships names the one my ancestor took to Quebec _Septentrio_. I find the same ship listed as _Septembrio_ on a Norwegian passenger list in the online records of the Canadian Library and Archives for the port of Quebec (arriving August 27, 1869). Does anyone know which name is correct? The Norway Heritage lists this information for the ship above the article: "1869 Captain Thor Torjesen from Christiania May 25 to Quebec Aug. 27." However, the body of the article states that "at 9 PM Tuesday, June 15 1869 the Septentrio was towed out from Risør to commence her first voyage," and later that the ship left Christiania on June 28. These three dates seem contradictory. Both the Norway Heritage page and the Canadian Library and Archives page agree that the ship anchored in Quebec on Aug. 27, 1869.