Gallery ◀ ROUGH SEA OF TRANQUILIT Y Ross Sackett Highly oblique lighting accentuates wrinkle ridges and rilles in western Mare Tranquilitatis and the curious circular set of ridges known as Lamont. The ragged Montes Haemus bound the region at left. Details: Celestron CPC Deluxe 1100 HD SchmidtCassegrain with ZWO ASI120MM-S video camera. Stack of 500 frames. ▾ GRANDEUR IN CORONA AUSTRALIS Fabian Neyer NGC 6723 (a globular cluster that's 13 billion years old) and a trio of bright reflection nebulae (bluish NGC 6726-7 and small, orangish NGC 6729) punctuate a crowded field. The bright star is Epsilon CrA. Details: ASA 12N astrograph, FLI ML8300 CCD camera, and LRGB filters. Total exposure: 8.1 hours. 76 September 2015 sky & telescope