The Bay of Rainbows and the Crater Harpalus

 

The Bay of Rainbows or Sinus Iridum near the terminator on a waxing gibbous Moon. 127mm Meade series 500 Apo Refractor, x3 Televue Barlow and QHY5-llc planetary camera. Credit: Pipp Stakkert.

"Harpalus is a 40km crater near to the north-west rim of the Moon just north of the Bay of Rainbows. The impact crater has been formed in the western extremity of the dark lunar lava locally known as the Mare Frigoris. The crater is thought to be a relatively new lunar feature and less than  1.1 billion years old." - Kurt Thrust current Director of the Jodrell Plank Observatory.