Observations of Titan's Northern lakes at 5 μm: Implications for the organic cycle and geology

► First infrared observation of Ligeia Mare and several small lakes in Titan's Northern polar area. ► This paper demonstrates that the lakes have not evolved in size between 2007 and 2010. ► It provides new information on the clarity of Titan's atmosphere at 5 μm. ► It discusses a simple model of carbon cycle. ► It revisits the value of Titan's non-synchronous rotation.