Flying over Idunn volcano on Venus
The coloured overlay shows the heat patterns derived from surface brightness data collected by the Visible and InfraRed Thermal Imaging Spectrometer (VIRTIS), aboard the European Space Agency's Venus Express spacecraft. Temperature variations due to topography were removed. The brightness signals the composition of the minerals that have been changed due to lava flow. Red-orange is the warmest area and purple is the coolest. The warmest area is centered on the summit, which stands about 2.5 kilometers (1.6 miles) above the plains, and the bright flows that originate there. Idunn Mons has a diameter of about 200 kilometers (120 miles).The spectrometer data was collected from May 2006 to the end of 2007.