Notable stellar objects in this constellation include its beta star Albireo and a namesake x-ray source designated X-1, believed to be caused by a black hole.
This object's namesake loop, also known as the Veil nebula, is a 5,000 year old supernova remnant, and other nebulae in it include the Pelican and North American, which are separated from the Butterfly nebula by the Northern Coal Sack. Notable stellar objects in this constellation include its beta star Albireo and a namesake x-ray source designated X-1, believed to be caused by a black hole. For 10 points, name this constellation, sometimes called the Northern Cross, whose brightest star is Deneb and which is associated with a swan.
This object's namesake loop, also known as the Veil nebula, is a 5,000 year old supernova remnant, and other nebulae in it include the Pelican and North American, which are separated from the Butterfly nebula by the Northern Coal Sack.
{Cygnus} [prompt on {Northern Cross} before mentioned]