Cygnus OB7 is an

OB association In astronomy, stellar kinematics is the observational study or measurement of the kinematics or motions of stars through space. Stellar kinematics encompasses the measurement of stellar velocities in the Milky Way and its satellites as well as t ...

in the giant Cygnus molecular cloud complex, which also contains the star-forming regions

Cygnus X Cygnus X may refer to: * Cygnus-X (star complex), a giant star formation region * Cygnus X (music group) See also * Cygnus X-1 (disambiguation) * Cygnus X-3 Cygnus X-3 is a high-mass X-ray binary ( HMXB), one of the stronger binary ...

, the

North America Nebula The North America Nebula (NGC 7000 or Caldwell 20) is an emission nebula in the constellation Cygnus, close to Deneb (the tail of the swan and its brightest star). The shape of the nebula resembles that of the continent of North America, complet ...

and the

Pelican Nebula The Pelican Nebula (also known as IC 5070 and IC 5067) is an H II region associated with the North America Nebula in the constellation Cygnus. The gaseous contortions of this emission nebula bear a resemblance to a pelican, giving rise to its n ...

. The Northern Coalsack Nebula of the Cygnus Rift lies in the foreground of this region. The molecular cloud has a large

angular size The angular diameter, angular size, apparent diameter, or apparent size is an angular distance describing how large a sphere or circle appears from a given point of view. In the vision sciences, it is called the visual angle, and in optics, it is ...

of ~4° × 7°.

References

Cygnus (constellation) Stellar associations {{Star-cluster-stub