Houtman Abrolhos australis"), are common between April and October, when the whales are migrating. Other marine mammals sometimes sighted at the islands include pygmy Bryde's whale ("Balaenoptera edeni"), orca ("Orcinus orca"), bottlenose dolphin ("Tursiops aduncus"), common dolphin ("Delphinus delphis"), and striped dolphin ("Stenella coeruleoalba"). The green turtle ("Chelonia mydas") and the loggerhead turtle ("Caretta caretta") both live in the waters off the Houtman Abrolhos, albeit in low numbers. Neither species breeds in the area, as water temperatures are too low. The Houtman Abrolhos is unusual in having a luxuriant and diverse living coral reef at such a high latitude. 194 species in
Delphinus bounds of the constellation since 1992. HR Delphini was a nova that brightened to magnitude 3.5 in December 1967. A nova was discovered by amateur astronomer Koichi Itagaki, Nova Delphini 2013. Giants within our galaxy in Delphinus aside from Delta, Gamma and Epsilon include: Its rich Milky Way star field means many modestly deep-sky objects. NGC 6891 is a planetary nebula of magnitude 10.5; another is NGC 6905 or the Blue Flash nebula. NGC 6934 is a globular cluster of magnitude 9.75. At a distance of about 185,000 light-years, the globular cluster NGC 7006 is at the outer reaches of